Chapter 4 Part A: Fuel and exhaust systems - carburettor ... · 4A•6 Fuel and exhaust systems - carburettor models 1 General information and precautions General information The

4A

Chapter 4 Part A: Fuel and exhaust systems - carburettor models

For engine to model applications refer to Chapter 2

Air cleanerType . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dry type with replaceable cartridge. Manual or automatic air

temperature controlled inlet systemElement:

BX 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion V402BX 14 (Aug 1988 to Sept 1991) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion V401BX 14 (Sept 1991 on) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion V438BX 16 (pre June 1987) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion W117BX 16 (Sept 1988 to 1991) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion U543BX 19 (pre June 1987) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion W117BX 19 (from July 1987) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion U543BX 19 (1991 on) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion U543

Fuel filterType . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion L101

Fuel pumpType . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical diaphragm, driven by eccentric on camshaft

Air cleaner element - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Air cleaner - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Accelerator cable - removal and refitting . . . . . . . . . . . . . . . . . . . . . 23Air intake heating system - operation and maintenance . . . . . . . . . . 4Carburettors - idle speed and mixture adjustment . . . . . . . . . . . . . . 13Carburettors - general information . . . . . . . . . . . . . . . . . . . . . . . . . . 11Carburettors - general maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 12Carburettors - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . 14Choke cable - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . 24Exhaust system - maintenance, removal and refitting . . . . . . . . . . . 26Fuel level transmitter - removal and refitting . . . . . . . . . . . . . . . . . . . 9Fuel pump - cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Fuel pump - removal, overhaul and refitting . . . . . . . . . . . . . . . . . . . 7Fuel pump - testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Fuel tank - removal, inspection and refitting . . . . . . . . . . . . . . . . . . . 10General information and precautions . . . . . . . . . . . . . . . . . . . . . . . . 1Inlet and exhaust manifolds - removal and refitting . . . . . . . . . . . . . 25In-line fuel filter (BX 16 RE) - renewal . . . . . . . . . . . . . . . . . . . . . . . . 8Solex carburettor 34 PBISA 17 - adjustment . . . . . . . . . . . . . . . . . . 16Solex carburettors 32-34 Z1 and 34-34 Z1 - adjustment . . . . . . . . . 19Solex carburettors 30-30 Z2 CIT 329 and 32-34 Z2 CIT 348 -

adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Solex carburettors 32-34 Z1 CIT 319, W 319 and 34-34 Z1 381 -

adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Solex carburettors - overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Weber carburettors - adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Weber carburettors - overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Weber carburettor 36 TLP - overhaul and adjustment . . . . . . . . . . . 22

4A•1

Specifications

Contents

Easy, suitable fornovice with littleexperience

Fairly easy, suitablefor beginner withsome experience

Fairly difficult,suitable for competentDIY mechanic

Difficult, suitable forexperienced DIYmechanic

Very difficult,suitable for expert DIYor professional

Degrees of difficulty

54321

Carburettor - BXEngine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 ACarburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solex 30-30 z2 CIT 329

Primary SecondaryVenturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 25Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.5 125Air corrector jet and emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 ZD 180 ZCIdle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 -Bypass jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 50Pneumatic enrichment device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 -Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 -Econostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 80Needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 mmFloat level setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ± 1 mmPrimary choke valve opening (strangler valve fully shut) . . . . . . . . . . . . 0.9 mmStrangler flap opening (by anti-flood capsule) under vacuum of 350 mbar . . 3.2 ± 0.5 mmIdle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700 to 800 rpmCO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 to 1.15

Carburettor - BX 14 (pre August 1988)Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 CCarburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solex 32-34 Z2 CIT 348

Primary SecondaryVenturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 25Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 120Air corrector jet and emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 ZE 160 ZCIdle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 -Bypass jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 50Pneumatic enrichment device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 -Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 35Econostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 80Needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 mmFloat level setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ± 1 mmPrimary choke valve opening (strangler valve fully shut) . . . . . . . . . . . . 0.75 mmStrangler flap opening (by anti-flood capsule) under vacuum of 350 mbar . . 3.7 ± 0.5 mmIdle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 to 850 rpmCO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 to 1.5

Carburettor - BX 14 (from August 1988)Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . K1GCarburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solex 34 PBISA 17Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ECIdle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 to 46Enrichment jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Accelerator pump jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Float chamber needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 mmIdle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750 ± 50 rpmCO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 to 1.2

Carburettor - BX 16 (pre June 1983)Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Weber 32-34 DRTC 100 W 121-50

Primary SecondaryVenturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 26Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 115Air corrector jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165 160Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F27 F27Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 -Bypass jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 70Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 -Econostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 60Needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175Primary choke valve opening at 20ºC . . . . . . . . . . . . . . . . . . . . . . . . . . 0.50 mmStrangler flap opening (by anti-flood capsule) . . . . . . . . . . . . . . . . . . . . 4.5 mmFloat level setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.25 ± 0.25 mmIdle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700 rpmC0 percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 to 1.5

4A•2 Fuel and exhaust systems - carburettor models

Carburettor - BX 16 (pre June 1983)Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solex 32-34 Z1 CIT 319

Primary SecondaryVenturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 26Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 120Air corrector jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 155Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 18Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 70Accelerator pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 35Needle valve diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 mmFloat setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.0 mmPrimary choke valve opening (strangler flap fully shut) . . . . . . . . . . . . . 0.45 mmStrangler flap opening (by anti-flood capsule) . . . . . . . . . . . . . . . . . . . . 6.0 mmIdle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 to 700 rpmCO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 2

Carburettor - BX 16 (from July 1983)Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Weber 32-34 DRTC 2/100 W 128-50

Primary SecondaryVenturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 26Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 112Air corrector jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 160Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F27 F27Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 -Bypass jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 50Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 -Econostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 60Needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.75Float setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.75 ± 0.25 mmMaximum difference between floats . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 mmPrimary choke valve opening (strangler flap fully shut) at 20ºC . . . . . . . 0.45 mmStrangler flap opening (by anti-flood capsule) . . . . . . . . . . . . . . . . . . . . 4.5 mmIdle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 to 700 rpmCO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 to 1.5

Carburettor - BX 16 (from July 1983)Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solex 32-34 Z1 W 319

Primary SecondaryVenturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 26Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 120Air corrector jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 155Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 18Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Bypass jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 70Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 35Enrichment device jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 -Econostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 80Needle valve diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 mmPrimary choke valve opening (1st choke at 20ºC) . . . . . . . . . . . . . . . . . 0.45 mmStrangler flap opening (by anti-flood capsule) under vacuum . . . . . . . . 6.0 mmIdle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 to 700 rpmCO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 to 1.5

Carburettor - BX 16 (from March 1984)Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solex 32-34 Z1 CIT 319-1This carburettor differs from the Solex 32-34 Z1 CIT 319 carburettor in the following ways:

Primary SecondaryIdling air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180 150Enrichment device jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 -

Carburettor - BX 16 (automatic transmission)Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Weber 32-34 DRTC 4 100 W 130-50This carburettor is the same as the Weber 32-34 DRTC 2/100 W 128-50 with the following exception:CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 2

Fuel and exhaust systems - carburettor models 4A•3

4A

Carburettor - BX 16 (automatic transmission and air conditioning)Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Weber 32-34 DRTC 8/100 W 136-50This carburettor is the same as the Weber 32-34 DRTC 4 100 W 130-50 with the following exception:Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750 to 800 rpm

Carburettor - BX 16 REEngine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1A/ACarburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Weber 36 TLP 1/100Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F80Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 to 51Enrichment jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Accelerator pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Float chamber needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 mmIdle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700 ± 50 rpmCO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 2

Carburettor - BX 16 (from Sept 1988 to 1991)Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B2CCarburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solex 32-34 Z1 PSA

Primary SecondaryVenturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 26Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.5 125Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 140Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ZD ZCIdling jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 50Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180 150Enrichment jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 -Econostat jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 80Accelerator pump jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 40Fuel inlet needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8Idle speed:

Manual gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 ± 100 rpmAutomatic transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750 ± 50 rpm

CO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 to 1.5

Carburettor - BX 19Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solex CISAC 34-34 Z1 381

Primary SecondaryVenturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 17Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 125Air corrector jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 160Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 20Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 90Idle air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 145Enrichment device jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 -Econostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 80Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 35Needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 mmFloat adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 mmPrimary choke valve opening (strangler flap fully shut) at 20ºC . . . . . . . 0.45 mmStrangler flap opening (by anti-flood capsule) . . . . . . . . . . . . . . . . . . . . 5 to 7 mmManual de-flooding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 to 9 mmIdle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 to 750 rpmCO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 ± 0.5

Carburettor - BX 19 TRS/TZS (from July 1986 to 1991)Engine applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D2A and D2ECarburettor types:

Manual gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solex 34-34 Z1 CIT 391Manual gearbox with air conditioning . . . . . . . . . . . . . . . . . . . . . . . . . Solex 34-34 Z1 CIT 291-1Automatic transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Weber 34-34 DRTC 14/100Automatic transmission with air conditioning . . . . . . . . . . . . . . . . . . . Weber 34-34 DRTC 15/100


Carburettor - BX 19 TRS/TZS (from July 1986 to 1991) (continued)Solex carburettors Primary Secondary

Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 27Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 115

Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 160Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ZD ZCIdling jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 90Idling air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 145Enrichment device jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 -Econostat calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 70Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 56Needle valve diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 mmFloat adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 mm Positive opening of primary valve (at 20ºC) . . . . . . . . . . . . . . . . . . . . 0.45 mmStrangler flap opening by anti-flood capsule. . . . . . . . . . . . . . . . . . . . 5 to 7 mmManual anti-flooding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 to 9 mmIdle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700 ± 50 rpmFast idling (air conditioning) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 ± 50 rpmCO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 to 2.0

Weber carburettors Primary SecondaryVenturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 27Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 125Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 150Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F45 F27Idling jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 50Idling air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 70Enrichment device jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 -Econostat calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 85Pump injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Float adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 mmPositive opening of primary valve (at 20ºC) . . . . . . . . . . . . . . . . . . . . 0 ± 1 mmStrangler flap opening by anti-flood capsule . . . . . . . . . . . . . . . . . . . 4.5 ± 1 mmManual anti-flooding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.5 mmIdle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 ± 50 rpmFast idling (air conditioning) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 ± 50 rpmCO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 to 2.0

Carburettor - BX 19 TZS (from 1991)Engine application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D2FCarburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solex 34-34 Z1

Primary SecondaryVenturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 27Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 ± 5 122 ± 5Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 ± 20 160 ± 20Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Z ZCIdling jet:

Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 ± 5 110 ± 10Automatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 ± 3 110 ± 10

Idling air correction jet:Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 ± 20 145 ± 20Automatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 ± 20 140 ± 20

Enrichment jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 ± 20 -Econostat jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 50 ± 20Accelerator pump jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 40Fuel inlet needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 mmIdle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750 ± 50 rpmCO percentage in exhaust gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 to 1.2

Torque wrench settings Nm lbf ftCarburettor to inlet manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 11Inlet manifold to cylinder head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 16Exhaust manifold to cylinder head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 16


4A


1 General information andprecautions

General informationThe fuel system is conventional in layout

and operation. The fuel tank is mounted onthe underside of the vehicle directly beneaththe rear passenger seats. Fuel is drawn fromthe tank by a mechanical diaphragm pumpoperated by an eccentric on the camshaft andfed via a fuel filter (some models) to acarburettor of Solex or Weber manufacture.Depending on model type, a manuallyoperated or automatic choke is fitted.

The air cleaner is of the renewable elementtype. On BX and BX14 models, thetemperature of the air entering the air cleanerunit has a manual control for seasonal setting.Other models in the range have an automatictemperature control fitted to the air cleaner.

All models are fitted with a basic emissioncontrol system which relies mainly on thecorrect setting of the carburettor and theignition system to keep exhaust emissionlevels to a minimum.

The admission of warm air to the air cleaneron all models keeps the intake air at thecarburettor at a constant temperature and thistoo makes for clean combustion.

The engine crankcase ventilation systemtransfers oil fumes and blow-by gases whichget past the piston rings into the air cleanerwhere they are consumed during the normalcombustion process.

Precautions

Fuel warningMany of the procedures in this Chapter

require the removal of fuel lines andconnections which may result in some fuelspillage. Before carrying out any operation onthe fuel system refer to the precautions givenin Safety first! at the beginning of this Manualand follow them implicitly. Petrol is a highlydangerous and volatile liquid and theprecautions necessary when handling itcannot be overstressed.

Tamperproof adjustment screwsCertain adjustment points in the fuel system

are protected by “tamperproof” caps, plugs orseals. The purpose of such tamperproofing isto discourage, and to detect, adjustment byunqualified operators.

In some EEC countries (though not yet inthe UK), it is an offence to drive a vehicle withmissing or broken tamperproof seals. Beforedisturbing a seal, satisfy yourself that you willnot be breaking local or national anti-pollutionregulations by doing so. Fit a new seal whenadjustment is complete, when this is requiredby law.

Do not break tamperproof seals on avehicle which is still under warranty.

Unleaded petrol - usageAs a general rule, all pre-1988 carburettor

models are not suitable for running onunleaded petrol, and must be run on 97 RONleaded fuel only. Models manufacturedbetween 1988 and 1991 should also only berun an 97 RON leaded fuel, but most modelsproduced between these dates are suitablefor running on 95 RON unleaded fuel if thesuitable adjustments are first carried out. Forfull information on the use of unleaded petrol,consult your Citroën dealer who will be able toinform you if your vehicle is capable ofrunning on unleaded fuel and, where possible,of the necessary adjustments required. Theuse of unleaded fuel in a vehicle not designed,or suitably adjusted, to run on unleaded fuelwill lead to serious damage of the valve seats.

2 Air cleaner element - renewal 1Refer to Chapter 1, Section 28.

3 Air cleaner - removal andrefitting 2

BX 14 - K1G engine1 Remove the air cleaner element.2 Release the large clip, then separate andremove the air intake from the air cleanercasing. Note the insulated hose connectingwith the exhaust manifold hot air collectorplate (see illustrations).3 Disconnect the air intake duct from thecarburettor and the crankcase vent hoses,then withdraw the air cleaner casing upwards.Note the locating spigot at the base of thecasing (see illustrations).4 Refitting is a reversal of removal. Oncompletion, set the Winter/Summer lever tothe appropriate position (see illustration).

All other models5 Detach the hoses/air ducts to the cleanerunit. 6 On BX and BX 14 models, unclip theretaining strap.

3.2a Air intake disconnected from aircleaner casing

3.2b Removing insulated hose fromexhaust manifold hot air collector plate

3.3a Disconnecting crankcase vent hosefrom air cleaner

3.3b Removing air intake duct fromcarburettor and air cleaner

3.3c Air cleaner casing

A Base locating spigotB Spigot grommet

7 Undo the retaining bolt(s) and remove theunit. 8 Refit in the reverse order to removal.

4 Air intake heating system -operation and maintenance 1

Operation1 To maintain engine performance in coldconditions, warm air is admitted to the airintake before entering the air cleaner. Air ispreheated by a muff on the exhaust manifoldand its intake is controlled manually by meansof a lever on the top face of the intake ducting(BX and BX 14 models) or automatically by anintegral thermostat (BX 16 and 19 models).2 The manual adjustment lever has threeadjustment positions (see illustration).3 On automatic control models, the integralthermostat operates a valve which directswarm air from the exhaust manifold ducting orcool air through the normal air intake duct onthe air cleaner unit (see illustration).

Maintenance4 This system calls for no specialmaintenance but, on manual control models,the adjustment lever must be set to theappropriate position as the season demands.Failure to make the seasonal adjustment willreduce efficiency, may cause the carburettorto ice up, and will certainly create emulsion inthe engine breather pipes and rocker cover invery cold weather.

5 Fuel pump - testing 21 If the performance of the fuel pump is indoubt, first examine for fuel leaks and checkthat the fuel line connections are all sound.2 Disconnect the fuel hose at the carburettorinlet connection and disconnect the hightension lead from the coil. Ensure that thetank contains fuel.3 Direct the fuel feed hose into a suitablecontainer and have an assistant operate thestarter to crank the engine. A good spurt offuel should be delivered on every secondrevolution of the engine. If not, check that thehose is not blocked. If the hose is clear, thenthe pump will have to be removed forexamination or renewal.

6 Fuel pump - cleaning 21 The fuel pump may be one of several typesand inspection will determine which type ofpump is fitted. On one type, the filter cover issimply unbolted and removed. On the othertype, the pump cover is retained by twoscrews. With some pumps, the fuel outlethose must be removed in order to be able towithdraw the pump cover (see illustrations).

2 With the cover removed, take out the filterscreen and wash it in fuel until it is free fromfluff and dirt (see illustration).3 Mop out the fuel from the pump body andwipe out any sediment.4 Refit the filter screen and cover, makingsure that the gasket is in good condition.

7 Fuel pump - removal,overhaul and refitting 3

Note: Have a repair kit available beforedismantling the fuel pump

Removal1 Disconnect the fuel lines from the pumpand plug them to prevent ingress ofcontamination (see illustration).2 Note that on BX 16 and BX 19 modelsmanufactured after November 1985, the fuellines have reduced inside diameterconnections and are now 6 mm in diameterinstead of 8 mm as on earlier models. All


4A

3.4 Air cleaner Winter/Summer lever 4.2 Manual air intake control

1 ETE (summer) setting2 Mixte (Mixture) setting3 Hiver (Winter) setting

4.3 Automatic air intake control

4 Air control flap5 Temperature sensorA Air supply to filterB Ambient air intakeC Heater air intake

6.1a Fuel pump cover removal - non-removable filter type

6.1b Fuel pump cover removal -removable filter type

6.2 Fuel pump filter removal

connections to the pump, carburettor, fuelfilter and fuel flow meter are now of the samediameter. Early and later-type connections arenot directly interchangeable. Note also thatthe later-type fuel lines are secured with clips.3 Unscrew the pump mounting bolts/nutsand lift the pump away (see illustrations).4 An insulator block with a gasket each sideis fitted between the pump flange and themounting flange on the engine. The gasketsmust be renewed when refitting the pump.5 Where applicable, withdraw the pumpoperating pushrod (see illustration).

Overhaul6 Further dismantling may not be possible onsome types of pump. Even if it is, it should onlybe attempted if you have a repair kit. First,mark the top and bottom halves of the pumpfor reassembly and then progressively loosenand remove the screws holding the two halvestogether. The diaphragm is connected to theoperating mechanism beneath, and details willvary with different pumps. Note the sequenceof assembly so that reassembly can beachieved in the same order.7 Renew all defective parts. The repair kit willcontain a variety of seals or gaskets whichshould automatically be fitted in place of theoriginals, regardless of the fact that they mayappear fit for further use.8 Reassembly is the reverse of thedismantling sequence. Make sure that theupper and lower halves of the pump body arealigned and tighten the joint screwsprogressively and diagonally. Do notovertighten the top cover screws.

Refitting9 Before refitting the pump, check that theoperating pushrod is in position (whereapplicable). Locate a new gasket each side ofthe insulator and refit the pump. 10 Tighten the securing bolts and make surethat the fuel hoses are reconnected to theircorrect pump connections.

8 In-line fuel filter (BX 16 RE) -renewal 2

1 From November 1987, BX 16 RE modelshave an in-line fuel filter fitted between thefuel pump and the carburettor.2 When renewing this filter, ensure that thedirectional arrow on the filter points towardsthe carburettor and check for leaks at its hoseconnections after starting the engine (seeChapter 1).3 Note that on BX 16 and BX 19 modelsmanufactured after November 1985, the fuellines have reduced inside diameterconnections and are now 6 mm in diameterinstead of 8 mm as on earlier models. Allconnections to the filter, carburettor, fuelpump and fuel flow meter are now of the samediameter. Early and later-type connections arenot directly interchangeable. Note also that thelater-type fuel lines are secured with clips.

9 Fuel level transmitter -removal and refitting 2

Removal1 Disconnect the battery earth lead.2 Fold the rear seat forwards and remove theinsulator mat.3 Prise free the circular plastic cover toexpose the fuel level transmitter anddisconnect the wiring from it (see illustration).4 Using a suitable tool, unscrew thetransmitter mounting plate to release it fromthe securing tabs. Withdraw the transmitterunit.

Refitting5 Refitting is a reversal of removal. Use a newsealing ring if there is any doubt about thecondition of the original one.

10 Fuel tank - removal,inspection and refitting 3

Removal1 The fuel tank will normally only need to beremoved if it is severely contaminated ordamaged, or for any repair work to theadjacent body structure or mechanicalcomponents.2 As there is no drain plug incorporated in thetank, the best time to remove it is when it isnearly empty. If this is not possible, syphon asmuch as fuel as possible from the tank into acontainer which can be sealed. Before doingso, observe the following precautions:a) Disconnect the batteryb) Do not smoke or allow any naked lights

near the working areac) Avoid placing the vehicle over an

inspection pit as fuel vapour is heavierthan air

3 Raise the rear of the vehicle and support iton axle stands (see “Jacking and vehiclesupport”).4 From within the vehicle, disconnect thewiring from the fuel level transmitter.5 Disconnect the fuel supply and return pipesfrom the fuel tank top face. Note that the fuel


7.1 Fuel supply hose removal from fuelpump

7.3a Fuel pump showing retaining nutsand black insulator block - BX 16

7.3b Fuel pump removal - BX 14

7.5 Fuel pump pushrod - BX 14

9.3 Fuel level transmitter

supply pipe is marked with yellow paint foridentification. Plug the pipes to prevent fuelleakage and the ingress of dirt (seeillustration).6 Remove the exhaust system.7 Detach the height control linkage, completewith its intermediate bearing (seeillustration).8 Detach the fuel filler pipe from the tank inletnozzle.9 Unfasten and peel back the carpet edgingfrom the floor panel above the leading edge ofthe tank, then unscrew the two front tankretaining screws. Support the weight of thetank from underneath.10 Unscrew and remove the three retainingbolts along the rear edge of the tank unit (fromabove), then lower the tank. As it is lowered,disconnect the ventilation pipe from the sideof the tank. On BX and BX 14 models, thispipe is connected to the right-hand side,whilst on BX 16 and 19 models, the pipeconnection is on the left-hand side.

Inspection11 If the tank is damaged, remove the fuellevel transmitter unit and renew the tank. Itcannot be repaired.

12 If the tank contains sediment, remove thefuel level transmitter and wash out the tankusing paraffin, then rinse it out with clean fuelwhilst observing all precautions against fire.

Refitting13 Refit in the reverse order of removal.

Ensure that all hose connections are securelymade.

11 Carburettors - generalinformation

1 The carburettor fitted is a single Solex orWeber of twin or single choke downdraughtdesign.2 The type of carburettor fitted is dependenton engine type. Refer to the Specifications forapplication details. Depending on vehicletype, a manually operated or automatic chokeis fitted.3 All carburettors are conventional in operationand have a primary and main jet system and amechanically operated acceleration pump. Allcarburettors incorporate exhaust emissioncontrol anti-pollution.4 The type identification number is stampedon a plate attached to the carburettor.5 The Weber carburettor fitted to BX 16models with automatic transmission isidentical in design to other Weber carburettortypes fitted to manual gearbox models,except that it also has a kickdown cam fitted.


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10.5 Fuel tank and associated components

1 Return hose2 Suction pipe filter3 Suction pipe (identified by yellow paint mark)4 Vent unit with one-way valve5 Filler pipe6 Tank vent pipe

A Fuel level transmitter - note correct fitting orientationB Fuel supply/return hose unit - note correct fitting orientation

10.7 Height control linkage (1) andintermediate bearing (2)

12 Carburettors - generalmaintenance 3

Note: A complete carburettor strip-down isunlikely to cure a fault which is notimmediately obvious without introducing newproblems. If persistent carburation problemsare encountered, it is recommended that theadvice of a Citroen dealer or carburettorspecialist is sought. 1 Before blaming the carburettor for anyshortcomings in engine performance,remember that there is no reason why thecarburettor should lose tune. What usuallyhappens is that, as the engine gets older andless efficient, more or less fruitless attemptsmay be made to restore performance byinterfering with the carburettor. In countrieswhere exhaust emission is regulated by law, itis inadvisable and may be illegal, to altercarburettor settings without monitoringexhaust emission levels using specialequipment.2 The ultimate cause of most carburettorproblems is wear in moving parts or dirt in thejets. The Solex and the Weber carburettorshave no continuously moving parts (except forthe float and the throttle spindle) which makesit a very reliable device so long as dirt doesnot get in. A drop of oil on the various linkagesand flap spindle will ensure that they last foryears without trouble. In consequence,carburettor overhaul should be no morefrequent than major engine overhaul.3 Routine carburettor maintenance consistsonly of periodic cleaning of the float chamberand jets and (where applicable) an occasionallook at the small gauze filters fitted in the fuelinlet connection and on the accelerator pumpinlet valve. These tasks can be undertakenwith the carburettor fitted to the engine.4 Before separating the top of the carburettorfrom the bottom, give the outside a goodclean using paraffin or a proprietary cleanerand a stiff brush, afterwards drying with cleanrag. It is well worth taking this extra trouble toreduce the risk of dirt getting into thecarburettor.

5 After removing the jets, clean them by firstwashing in clean fuel and then blowing airthrough them. Never use a piece of wire as jetcalibration can be easily altered.6 The float can be removed after taking outthe hinge pin. The float needle valve can thenbe unscrewed and washed in fuel. Clean anydirt out of the float chamber using clean fuelbut do not use rag for drying.7 The fuel inlet filter gauze and theaccelerator pump valve gauze should both bewashed in clean fuel and dried in air. Do notuse rag to dry them. On refitting the float,check and if necessary adjust, the levelsetting.8 On completion check the idle speed.

13 Carburettors - idle speed andmixture adjustment 3

Note: Before carrying out any carburettoradjustments, ensure that the ignition timing,valve clearances and spark plug gaps arecorrectly setNote: After resetting the mixture, have anexhaust CO reading taken by your Citroëndealer to ensure that it is within the specifiedlimitsNote: Information for adjustment of the Solexcarburettor 34 PBISA 17 is contained inSection 161 Generally speaking, unless the carburettoris obviously out of tune or is malfunctioning, itis not advisable to tamper with it. In any case,the only running adjustment that can be madeis to the idling.2 Correct adjustment can only be achievedprovided that the engine is in generally goodcondition. Valve clearances must be correct

and the ignition system must be in goodcondition and adjusted correctly.3 An independent tachometer is necessary tomake accurate adjustment and it should beconnected to the engine in accordance withthe manufacturer’s instructions.

Idle speed adjustment4 Refer to Chapter 1, Section 23.

Mixture adjustment5 Where adjustment is to be made to themixture control screw, it may first benecessary to prise free the tamperproof capfor access (see illustrations).6 With the air filter fitted, run the engine untilwarm, as indicated by the engagement of thecooling fan. When the cooling fan cuts out,adjustments can be made. During prolongedadjustments take care as the cooling fan willcut-in again periodically.7 Turn the mixture screw to the positionwhich provides the highest engine speed.Now reduce the engine speed toapproximately 50 rpm above the specified idlespeed for your model.8 Repeat the procedure outlined in paragraph10, then screw in the mixture control screw toreduce the engine speed by 30 to 50 rpm.Further minor adjustment to the idle speedmay be necessary to bring the engine speedto within the idle speed range specified.9 Whenever the mixture control screw settinghas been reset, it is advisable to have anexhaust CO reading taken by your Citroëndealer to ensure that the CO reading at theexhaust is within the specified limits. This is ofparticular importance in territories where strictemission controls are enforced.


13.5a Solex 32-34 - mixture adjustmentscrew location (6)

13.5b Weber carburettor - mixture adjustment screw (arrowed)

14 Carburettors - removal andrefitting 3

Removal1 Disconnect the battery earth lead.2 Unclip and detach the air ducting betweenthe carburettor and the air cleaner unit. Wherea Solex 34 PBISA 17 carburettor is fitted, theair cleaner must be removed.

3 Disconnect the wire from the idle cut-offsolenoid (see illustration).4 Disconnect the fuel supply and return linesfrom the carburettor (see illustrations). Plugthe hoses to prevent the ingress ofcontamination.5 Note that on BX 16 and BX 19 modelsmanufactured after November 1985, the fuellines have reduced inside diameter connectionsand are now 6 mm in diameter instead of 8 mmas on earlier models. All connections to thecarburettor, fuel pump, fuel filter and fuel flowmeter are now of the same diameter. Early andlater-type connections are not directlyinterchangeable. The only exception to this is ifa later-type Solex carburettor is fitted. In thisinstance, it will be necessary to renew the fuelfeed connection to suit. Note also that thelater-type fuel lines are secured with clips.6 Detach the accelerator inner cable from thequadrant and the outer cable from its supportat the carburettor and fold it back out of theway. 7 On manual choke models, detach the chokecable by loosening the inner cable clampscrew. Unscrew the outer cable locationclamp bolt and move the cable out of the way.

8 On automatic choke models, clamp thecoolant hoses each side of the choke unit,then loosen the securing clips and detach thehoses from the choke unit (see illustration). Ifthe hoses are not clamped, the coolingsystem will have to be partially drained toprevent coolant loss when the hoses aredetached.9 On BX 16 models fitted with the Solex32-34 Z1 CIT 319-1 carburettor, disconnectthe ventilation hoses from the float chamber.Note that the upper hose is connected to theair filter at the other end (see illustration).10 Where applicable, disconnect the vacuumhose from the carburettor (see illustration).11 Unscrew and remove the space flangeretaining screw and pull the flange away fromthe carburettor body.12 Unscrew and remove the four nutssecuring the carburettor to the inlet manifold,then lift the carburettor away from it forremoval. Retrieve the old joint gasket andplace a piece of clean cloth over the aperturein the manifold to prevent the ingress ofcontamination while the carburettor isremoved.


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14.8 Solex 32-34 - coolant hoseconnections

14.4b Solex 32-34 - fuel supply and returnhoses

14.9 Solex 32-34 - ventilation hoseconnections

14.10 Solex 32-34 - vacuum hoseconnection (1) and spacer flange

connection (2)

14.3 Weber carburettor - idle cut-off (14), spacer flange (15) and screws (16)

14.4a Weber carburettor removal - items to be disconnected

a and b Coolant hoses toautomatic choke

9 Air filter duct10 Fuel inlet pipe

11 Fuel return pipe12 and 13 Coolant hose

retaining clips

Refitting13 Refitting the carburettor is the reverse ofthe removal procedure. Remove all traces ofthe old gasket and use a new one oninstallation.14 After fitting the carburettor, reconnect theaccelerator cable and (where applicable) thechoke cable. When the choke control cable isfitted and the choke knob is pushed fully in,the flap should be fully open and there shouldbe a small amount of possible additionalmovement on the control knob. Check thatthe flap closes when the control is pulled.15 After reconnecting the two coolant hoses,remove any clamps used.16 Top up the cooling system.17 Adjust the idle speed on completion.

15 Solex carburettors - overhaul 31 The carburettor should not normally need tobe dismantled except for cleaning andchecking the float level.2 The carburettor is a relatively delicateinstrument and requires careful handling. Usethe correct tools for the job and do notinterchange jets or clean them out with wirewhich will cause damage and interfere withcalibration.3 Before dismantling, clean the outside of thecarburettor and prepare a clean work area.4 It is sound policy to ensure that individual

carburettor parts are fitted in their exactoriginal position, even though they mayappear to be interchangeable. To help in thisprocedure, label items, put small parts incontainers so that they do not become mixedup, and lay parts out in order of assembly onclean paper.5 Identify the relevant illustration for thecarburettor being dismantled (seeillustrations).6 Undo the retaining screws and the chokelink connecting screw, seen behind the arm ofthe spring (see illustration) and lift thecarburettor top cover away from the mainbody (see illustration)7 The float can be removed by pushing outthe hinge pin and then the needle valveassembly can be unscrewed from the cover.Unscrew the fuel inlet connection and removethe gauze filter. Examine the filter forcontamination.8 Remove the accelerator pump operatingrod and then remove the cover byprogressively undoing the four retainingscrews whilst restraining it against the actionof the spring under the diaphragm. Examinethe diaphragm for splits or damage.9 Remove the accelerator pump inlet valvecover located in the bottom of the floatchamber, taking care not to lose the ballvalve. Examine the filter for contamination.10 Unscrew and remove the jets, checkingthem for dirt or blockage.11 It should not be necessary to interferewith any adjusting screws but, if this isnecessary, count the number of turns requiredto remove the screw so that it can be refittedin approximately the same position. 12 Do not disturb the choke flap and throttlebutterfly valve or spindles. Their actuatingmechanisms are external and normally requireno attention unless excessively worn. If thespindles are worn in the carburettor body thenserious consideration should be given torenewing the complete carburettor. Air leaksaround a worn spindle makes it impossible totune the carburettor correctly and poorperformance and impaired economy willinevitably result.13 The respective chambers, passages andjet seats can be brush cleaned using cleanfuel and then blown dry. Do not use cloth.Clean and blow through the jets in a similarmanner.14 Reassembly is the reverse of thedismantling procedure. Use new washers,gaskets, or seals, wherever fitted. Duringreassembly, check and adjust the float level. 15 On refitting the carburettor, check the idlespeed setting and adjust as necessary.Further “on vehicle” carburettor adjustmentsmay be necessary, check with the appropriatecarburettor Section.


15.5a Sectional view of Solex carburettor - BX and BX 14

1 Fuel inlet2 Fuel return3 Needle valve4 Float level adjusting tab5 Float6 Progression fuel jet7 Progression air jet8 Main jet

9 Air correction jets10 Idle jet11 Idle air calibration12 Idle mixture adjustment

screw13 Idle speed adjustment

screw14 Accelerator pump cam

15 Accelerator pump16 Accelerator pump injectors17 Power enrichener18 Enrichener calibration19 Enrichener valve21 EconostatA Primary barrelB Secondary barrel


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15.5c Solex 30-30 and 32-34 Z 2 - top view with cover removed

1 Main jet (primary)2 Secondary venturi

3 Main jet/air correctorjet/emulsion tube (secondary)

4 Primary venturi5 Pump injector

15.5d Solex 32-34 and 34-34 Z 2 - top view with cover removed

1 Main jet2 Primary venturi3 Pump injector

4 Main jet/air correctorjet/emulsion tube (primary)

5 Secondary venturi

15.5b Solex 32-34 carburettor withautomatic choke - BX 16

a Air corrector jetsCbp Bypass jetCe Enrichment device jetCE Econostat fuel jetg Idle jetGg Main jetF Floati Pump injectorK VenturiP Needle valve 1st body

1st body1st body

2nd body

2nd body 2nd body

16 Solex carburettor 34 PBISA17 - adjustment 3

1 The following adjustments must be madewith the ignition timing correctly adjusted, theair cleaner fitted and the engine at normaloperating temperature.2 Connect a tachometer to the engine.3 Where necessary, remove the tamperproofcap from the mixture adjustment screw.

Without exhaust gas analyser4 Turn the throttle stop screw to adjust theengine speed to 750 ± 50 rpm (seeillustration).5 Turn the mixture adjustment screw toobtain the highest idling speed (seeillustration).6 Repeat the procedure given in paragraphs4 and 5 until the engine speed is 750 ± 50 rpm(i.e. after adjusting the mixture screw).7 Screw in the mixture adjustment screwslightly until the engine speed starts todecrease.

With exhaust gas analyser8 Turn the throttle stop screw to adjust theengine speed to 750 ± 50 rpm.

9 Turn the mixture adjustment screw toobtain the specified CO reading.10 Repeat the procedure given in paragraphs8 and 9 until the idle speed is 750 ± 50 rpm.

17 Solex carburettors 30-30 Z2CIT 329 and 32-34 Z2 CIT348 - adjustment

3Float level setting1 This check can be made with thecarburettor in the vehicle but the air cleanerduct will need to be detached and thecarburettor top cover disconnected andremoved.2 Check that the floats are not punctured andalso that the float arm pivot pin and supportholes are not excessively worn.3 With the top cover inverted and the gasketin position, measure the distance (A) from thegasket to the tip of the float (see illustration).This distance should be in accordance withthe float level specified for the carburettortype.4 If adjustment is necessary, carefully bendthe float tongue (which bears on the needle) inthe required direction and recheck the levelsetting. Further adjustment may be necessaryto achieve the correct adjustment (seeillustration).5 If the difference in height of each floatexceeds 1 mm, bend the float link arms sothat they are level then recheck the floatsetting.6 When refitting the top cover to thecarburettor main body, use a new gasket.

Strangler (choke) flap setting7 This check can be made with thecarburettor in the vehicle but the air duct mustbe detached. Run the engine to provide thenecessary manifold vacuum.8 Pull the choke lever to its full extent andretain it in position. This will subject the


15.6a Solex 32-34 Z1 W 319 - choke control unit shown withcover removed. Choke link screw (arrowed)

15.6b Solex carburettor - top cover screws (arrowed)

16.4 Solex 34 PBISA - throttle stop screw (1)

16.5 Solex 34 PBISA - mixture adjustment screw (2)

17.3 Solex 30-30 and 32-34 Z 2 - float level setting (A)

anti-flooding capsule to a vacuum of 350mbar and should open the strangler flap thespecified amount. To check the flap opening,insert a gauge or twist drill down between theflap and the inner wall of the venturi (B) (seeillustration).9 If necessary, adjustment can be made toopen or close the flap to the specifiedclearance by turning the adjustment screw(see illustration) in the required direction.

Primary choke valve (throttle)setting10 The carburettor must be removed andinverted for this check.

11 Hold the strangler flap in the closedposition and check the clearance between theouter edge of the butterfly valve and theventuri wall (see illustration). To check theclearance, insert a gauge or twist drill of thesame diameter as the specified clearancebetween the two.12 If adjustment is necessary, prise free thetamperproof cap from the adjustment screwand turn the screw in the required direction toset the clearance (see illustration). Oncompletion, a new tamperproof cap should befitted but this must be entrusted to yourCitroën dealer as a special tool is required.

18 Solex carburettors 32-34 Z1CIT 319, W 319 and 34-34 Z1381 - adjustment 3

Note: The following adjustments were madewith the carburettor in the vehicle

Float level setting1 The float level setting check andadjustment procedure is similar to thatdescribed in the previous Section for otherSolex carburettors.

Strangler (choke) flap setting2 A special Citroën gauge (OUT 180143-T) isrequired to make this check. If this gauge isnot available, then the check will have to bemade by a Citroën dealer (see illustration).3 Start and run the engine up to its normaloperating temperature, when the cooling fanwill cut in and then out.4 Remove the air intake duct from thecarburettor.5 Remove the cover from the automaticchoke housing (see illustration 15.6a).6 Locate the gauge into position and checkthat the mobile roller is correctly positionedbetween the two gauge slots. If not, turn theadjustment screw of the heat-extensiblecapsule to meet this requirement (seeillustration). Prevent the nut from turning byusing a 3 mm diameter drill (see illustration).7 Now reposition the gauge so that it is asshown (see illustration) and, with the enginerunning at idle speed, check that the stranglerflap is open to give a gap of 6 ± 1 mm betweenits outer edge and the wall of the carburettor.Use a gauge or twist drill of suitable diameterto assess the clearance. If adjustment isnecessary, turn the adjustment screw (A).


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17.9 Solex 30-30 and 32-34 Z 2 - chokeflap adjuster (3) and idle screw (4)

17.11 Primary choke (throttle) valve-to-venturi clearance (C)

17.12 Solex 30-30 and 32-34 Z 2 - primarychoke valve adjuster screw location (5)

18.2 Special automatic choke gauge (OUT 180 143-T) for Solex carburettors

17.4 Solex carburettor - float level setting adjustment

1 Float arm link 2 Float tongue

17.8 Solex carburettor - strangler (choke) flap clearance (B)

8 Turn off the engine and leave the gauge inthe previously set position. Open up theaccelerator to its full extent, hold it in thisposition and check the strangler flapto-carburettor wall clearance which should be8 mm. If this clearance is incorrect, prise openthe actuating fork jaws (to increase theclearance) or pinch them together (to reducethe clearance) as necessary.

Primary choke valve (throttle)setting9 Leave the gauge in the previously setposition, connect up a tachometer to themanufacturer’s instructions and restart theengine.

10 The engine speed should increase tobetween 2350 to 2450 rpm for models fittedwith a shim on the choke cam or between1700 and 1800 rpm for models without thisshim. If the engine speed is not within theselimits, adjust screw D.11 Note that the above mentioned shim wasfitted during manufacture to increase theengine speed during the choke phase whenused during the first 600 miles. If still inposition after this mileage has been covered,it can be removed by prising it free with a thinscrewdriver (see illustration).12 On completion, remove the gauge andtachometer, refit the choke cover andreconnect the air filter duct.


18.6a Solex 32-34 Z1 W 319 - accessaperture for screwdriver to adjust heat

extensible capsule screw (arrowed)

18.6b Solex 32-34 and 34-34 Z 1 - mobile roller adjustment forautomatic choke control

4 Screwdriver5 Special gauge (OUT 180

143-T)

6 3 mm drill7 Nut8 Movable roller

18.7 Solex 32-34 and 34-34 Z 1 - strangler flap opening check

A Adjuster screwB Gauge/twist drillC Actuator fork jaws

D Primary choke valveadjuster screw

18.11 Solex 32-34 Z1 CIT 319-1 - temporary shim (1). Remove after initial 600 miles 19.2a Solex 32-34 Z1 and 34-34 Z1 - strangler (choke) flap setting

1 Refer to illustration 19.2b3 Roller

4 Primary choke flapadjustment screw

19 Solex carburettors 32-34 Z1and 34-34 Z1 - adjustment 3

Note: The carburettor must be removed fromthe vehicle for these adjustments

Strangler (choke) flap setting1 Remove the cover from the automaticchoke housing.2 Measure the distance from the top of thechoke housing to the roller (see illustration)and compare it with the value in theaccompanying table (see illustration).3 Adjust if necessary, using a screwdriverinserted through the hole just above thedeflooding capsule - see illustration 18.6a.(see illustration).

Primary choke valve (throttle)setting4 With the ambient temperature at a steady20ºC (68ºF), insert a gauge or drill shank to

establish the opening of the primary chokethrottle valve (see illustration 17.12).5 This opening should be as specified. If not,adjust the appropriate screw (see illustration19.2a).

Anti-flood capsule setting6 Using pliers, push the anti-flood capsule linkrod back into the capsule as far as it will go.Measure the strangler (choke) flap openingwith the link rod in this position. If the openingdoes not correspond to that specified, adjustby means of the locknut and screw on theoutside of the anti-flood capsule. Release thelink rod (see illustration).

Mechanical (forced) deflooding7 Fully open the primary throttle valve andmeasure the strangler flap opening in thisposition. It should be 8 mm. Adjust if nec-

essary by bending the actuator fork jaws (seeillustration 18.7).8 Refit the choke housing cover whenadjustments are complete.

20 Weber carburettors -overhaul 3

1 The overhaul procedure for Webercarburettors is similar to that described for Solexcarburettors but note the information given forthe Weber 36 TLP carburettor in Section 22. 2 Refer to the accompanying illustration forguidance on component location (seeillustration). 3 Before refitting the top cover, check thefloat level setting. Also make other checksand adjustments as necessary.


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19.2b Table relating temperature to distance “a” in illustration 19.2a

19.3 Solex 32-34 Z1 and 34-34 Z1 - strangler (choke) flapadjustment screw (5)

19.6 Solex 32-34 Z1 and 34-34 Z1 - anti-flood capsule adjustment

1 Link rod (arrow indicates restposition)

2 Locknut3 Adjustment screw

20.2 Weber 32-34 DRTC - top view with cover removed

1 Primary venturi2 Pump injector3 Idle jet4 Main jet/air corrector jet/emulsion tube

5 Secondary venturi6 Main jet (secondary)/air corrector

jet/emulsion tube7 Bypass jet

21 Weber carburettors -adjustment 3

Float level setting1 This check can be made with thecarburettor in position in the vehicle. The aircleaner duct will need to be detached and thetop cover disconnected and removed.2 Check that the floats are not punctured andthat the float arm pivot pin and support holesare not excessively worn.3 Fit the gasket in position on the cover faceand support the cover vertically so that thefloats hang downwards. Check that theneedle valve ball is not pushed in, thenmeasure the clearance between the gasketand the float (see illustration).4 Compare the distance measured with thespecified float setting and, if necessary, adjustthe float setting by bending the float armtongue (which bears against the needle valve).Recheck the level setting (see illustration).5 If the difference in height between eachfloat exceeds 1 mm, bend the float link armsso that they are level then recheck the floatsetting. 6 Use a new gasket when refitting the topcover.

Strangler (choke) control check7 Before making this check, the engine musthave been switched off for a minimum periodof 30 minutes to allow the ambienttemperature around the choke thermostaticcapsule to have stabilised. You will need a

thermometer to measure the air temperaturewhen making the check.8 Measure the distance between the leverend face and the roll (see illustration).Measure the air temperature around thethermostatic capsule then refer to thetemperature/distance tables and compare the

readings taken (see illustration). Where thetemperature measured is not shown on thetable, an estimate can be made.9 If adjustment is necessary, turn the adjusterscrew in the required direction to the pointwhere the correct distance is given (seeillustration).


21.3 Weber carburettor - float level check

a = float-to-gasket face clearance

21.4 Weber carburettor - float leveladjustment

1 Float tongue 2 Float link arm

21.8a Weber carburettor - strangler(choke) control check

Measure distance (b) between lever endface(3) and roll (4)

21.8b Dimension “b” in illustration 21.8a must be in accordance with temperature atthermostatic capsule

A 32-34 DTRC 100 W 121-50 B 32-34 DTRC 2/100 W 128-50

degrees

Primary choke valve (throttle)setting10 This check can only be made with thecarburettor removed. When making thischeck, the ambient temperature and thecarburettor temperature should be 20ºC.11 Insert a gauge of the specified diameterbetween the venturi wall and the primarychoke valve.

12 If the clearance is not as specified, adjustit by turning the adjustment screw (clockwiseto decrease the opening or anti-clockwise toincrease the opening) (see illustration).13 As with the strangler control check, theopening should be checked after thethermostatic capsule temperature has beenallowed to stabilise for a minimum period of 30

minutes. If the ambient temperature aroundthe capsule differs from that specified then theprimary choke valve opening will differ also,and reference should then be made to thetable shown (see illustration). The valveopening should be in accordance with theambient temperature shown.14 Where the ambient temperature differsfrom those given, an estimate can be made.

Strangler (choke) flap setting15 Before checking the strangler flapopening, certain preliminary checks must bemade. First remove the control spring bydetaching the retaining circlip at each end (seeillustration). With the control spring removed,check that the length measured between theend rings is between 40.3 and 40.7 mm (seeillustration). If this measurement is notcorrect, renew the control spring.16 Remove the two anti-flooding capsuleretaining screws and unclip the capsulecontrol rod retaining circlip. Remove thecapsule unit and check that the port is clear(see illustration), also the gallery opening inthe base of the carburettor.17 Refit the anti-flood capsule and thecontrol spring.


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21.9 Weber carburettor - automatic chokeadjuster screw (5) 21.12 Weber carburettor - turn screw (6)

to alter primary choke valve opening.Thermostatic capsule (7) also indicated

21.15a Weber carburettor - strangler flapopening check

1 Circlip2 Control spring

3 Circlip4 Screws

21.13 Weber carburettor - primary choke valve opening to be in accordance withtemperature at thermostatic capsule

A 32-34 DTRC 100 W 121-50 B 32-34 DTRC 2/100 W 128-50

21.15b Measure control spring betweenend rings

a = 40.5 ±0.2 mm

18 The strangler flap opening can now bechecked. A clamp will need to be fabricated tohold the strangler in the low temperatureposition. Note the clamp dimension and fittingposition (see illustration). The clamp is fittedto ensure that the strangler flap is fully openedfor the check. Position the clamp over theshaft and the thermostatic capsule heatingpipe.19 Push against the anti-flood capsulecontrol rod and check the strangler flapopening using a gauge rod or twist drill of thesame diameter as the specified clearance(see illustration).

20 If the strangler flap opening is not asspecified, adjust it by turning the screw withinthe anti-flood capsule in the appropriatedirection. On completion remove the bracket.

22 Weber carburettor 36 TLP -overhaul and adjustment 3

1 This carburettor is a single chokedowndraught type with a manual choke.

Overhaul2 For overhaul refer to Section 15 for generalprinciples and to the accompanyingillustrations for jet location (see illustrations).

Idle speed and mixtureadjustment3 These adjustments are essentially asdescribed in Section 13 (see illustration).

Float level setting4 For float level setting, make up a gauge asshown (see illustration). Remove the floatchamber cover and hold it vertically. With thegasket in position, the gauge should justcontact the floats (see illustration). Bend thefloat tongue and connecting bars if necessary.

Cold start (choke) adjustments5 These are not routine adjustments butshould be performed if difficult cold starting isexperienced.


21.16 Weber carburettor - check that port (6) is clear 21.18 Weber carburettor - strangler flap

opening adjustment

6 Anti-flood capsule7 Clamp (dimension b to equal 103 mm)8 Shaft/heater pipe of thermal capsule9 Lever

21.19 Weber carburettor - strangler flapopening (d)

22.2a Weber 36 TLP - top cover

1 Main jet 2 Fuel inlet needlevalve

22.2b Weber 36 TLP - jet locations

3 Idle jet4 Air correction jet

5 Emulsion tube

22.3 Weber 36 TLP - mixture adjustment screw (2)

22.4a Weber 36 TLP - float level setting gauge

Dimensions in mm

22.4b Weber 36 TLP - checking float level

1 Gasket

6

Strangler opening after starting6 Remove the air inlet from the top of thecarburettor. Pull the choke control knob outfully to close the strangler flap.7 Disconnect the vacuum pipe from theanti-flood capsule. Connect a hand vacuumpump to the capsule.8 Apply vacuum (400 mm Hg approx.) to thecapsule. The strangler flap should open farenough to admit a gauge of 5 mm diameter(see illustration).9 Adjust if necessary by means of the screwon the anti-flood capsule.10 Disconnect the vacuum pump, remakethe original vacuum connection and close thestrangler flap.

Mechanical opening11 Having adjusted the anti-flood capsule asjust described, move the strangler openingroller into the recess of the cam as shown(see illustration).12 Check that the strangler flap opening justadmits a gauge of 8 mm diameter.13 Adjustment is carried out by turning thenut shown after removing the carburettor (seeillustration).14 When adjustment is complete, refit thecarburettor and air inlet.

23 Accelerator cable - removaland refitting 2

Removal1 Pivot the carburettor throttle controlquadrant and hold it in the open throttleposition. Release the accelerator inner cablefrom the quadrant groove.2 Release the outer cable from the locationbracket on the carburettor (see illustration).3 Working inside the vehicle, detach thecable end fitting from the end of theaccelerator foot pedal. Withdraw the cablefrom the vehicle by pulling it into thepassenger compartment, at the same timefeeding it through the bulkhead grommet.

Refitting4 Before fitting a new cable, lubricate theinner cable with engine oil.5 Refitting an accelerator cable is the reverseof the removal procedure. On completioncheck cable operation is satisfactory throughits range of travel and allows full throttle

opening and closing on its return. If necessary,adjust the outer cable at the location bracketas required and fit the securing clip.6 On automatic transmission models, theaccelerator cable and kickdown cableadjustment checks are described in Chap-ter 7B.

24 Choke cable - removal andrefitting 2

Removal1 Loosen the clamp bolt securing the innercable to the choke flap operating link.2 Loosen the bolt securing the clamp platewhich holds the outer sheath on thecarburettor bracket. Detach the inner cableand outer sheath from the carburettor.3 Working inside the vehicle, remove theknob from the choke control cable and undothe control retaining nut. Push the control


4A

22.8 Weber 36 TLP - checking strangler opening after starting

1 Anti-flood capsule adjustment screw

22.11 Weber 36 TLP - checking strangler mechanical opening

a Cam 3 Roller

22.13 Weber 36 TLP - stranglermechanical opening adjustment nut (4)

23.2 Solex carburettor - accelerator cablelocation bracket. Adjustment/securing clip

of outer cable is indicated

through the facia and then disconnect thechoke warning light cable from the switch onthe control.4 Pull the control assembly into the vehicle,working it through the rubber grommet in thebulkhead.

Refitting5 Refitting the choke control is the reverse ofthe removal procedure.6 With the cable fitted and with the air cleanerremoved, check that the choke is fully openwhen the control knob is pushed home andclosed when the knob is pulled. Check alsothat the warning light is on when the choke ispulled.

25 Inlet and exhaust manifolds -removal and refitting 3

Removal1 The inlet and exhaust manifolds are locatedon opposite sides of the cylinder head. Theycan be removed individually or together withthe cylinder head. Removal of the exhaustmanifold with the cylinder head in situ is moredifficult due to its close proximity to thebulkhead. 2 The inlet manifold can be removed with orwithout the carburettor attached. Whichevermethod is employed, the carburettorconnections and associated coolant hosesmust first be detached.3 When removing the exhaust manifold, firstraise and support the vehicle at the front endto allow access to the manifold and exhaustdownpipe flange connection nuts/bolts (seeillustrations).4 If on removal, the manifolds are found to bedamaged in any way, then they must berenewed.

Refitting5 Before refitting, clean the mating flangefaces of the manifold and cylinder head.Always use new gaskets.6 Tighten the retaining nuts and bolts, evenlyand in a diagonal sequence, to the specifiedtorque setting.

26 Exhaust system -maintenance, removal andrefitting

2Maintenance1 Refer to Chapter 1, Section 6.

Removal2 When removing an old system, do not wastetime trying to undo rusted and seized nuts,bolts or clamps. Cut them off. New ones willbe required in any case if they are that bad.

Refitting3 When fitting a system, use an exhaust jointsealant when assembling pipe sections toensure that the joints are free from leaks. Getthe system into position, but do not tighten

connections until everything is properly located.If the flexible hangers have deteriorated thenthey must be renewed (see illustration).4 When reassembling the spring-loaded jointcoupling, the joint and retaining screw headsmust be lubricated with a special hightemperature grease which can be obtainedfrom a Citroën dealer. On BX and BX 14models, tighten the joint bolts evenly to thepoint where the compressed spring length is 22mm. On BX 16 and BX 19 models tighten thebolts evenly until the cup contacts the screwshoulder (see illustration).


25.3a Exhaust manifold with air filter hotair collector cowling fitted - BX 16

25.3b Exhaust manifold-to-downpipeconnection - BX 16

26.3 Exhaust system flexible hanger(arrowed)

26.4 Exhaust system layout. Lubricate as specified at pointsindicated, according to type

L (BX and BX 14models) = 22 mm

A Expansion chamberB Silencer

C ShoulderD Cup

Documents

Chapter 4 Part A: Fuel and exhaust systems - carburettor ... · 4A•6 Fuel and exhaust systems - carburettor models 1 General information and precautions General information The