PIERBURGServiceinformation s

Reg

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r. 4

/4 0

3-13

0.2

GB

- N

D 1

1.02

Vacuum pumpNotes for the installation of a new vacuum pumpWear on the stroke curve

si 0025/A GB MSI-PG 11.02

Vehicle: MB Dieselpassenger cars fromconstruction year 1968 on →→→→→

Product: Vacuum pumpPierburg ref. no. O.E. ref. no.7.20208... various*7.20547...7.20607...

Installation notes

Attention!Vacuum pumps are safety parts.Therefore installation and rem-oval may only be carried out byauthorized specialist workshops.

For Vacuum pumps:7.20208..., fig. 17.20547..., fig. 27.20607..., fig. 3

- Install vacuum pump only if thestroke curve is in a perfectcondition; see chapter “wear onthe stroke curve”.

- Install only when the cams are intheir lower position, and screw oncrosswise

- Always use the new enclosedgasket.

For 7.20607..., fig. 3- Before installing this vacuum

pump the assembly basket (3,fig. 4) of older vehicles should beremoved. It is screwed on in thecrankcase in front of the injectionadjusting device.New vehicles don’t have thisassembly basket any more.

Attention. The assembly basketmust not be installed again afterremoval.It may only be installed as an aidduring removal of the injectionpump. This ensures that theinjection adjusting device will notget stuck when the engine turns.

For 7.20547..., fig. 2For 7.20607..., fig. 3- After installation of the vacuum

pump leave the vacuum line openfor the time being.

- Install belt, fan, and fan hood.- With the engine running fill in

approximately 50 cm3 of cleanengine oil into the vacuum pumpusing the open vacuumconnection, and connect vacuumline immediately.

MPSN Diaphragm pump fordouble cam front drive

7.20208...

KPSN Piston pump fordouble cam front drive

7.20547...

KPSN Piston pump fordouble cam front drive

7.20607...

Fig. 3

1

435

2

Fig. 4

1 vacuum pump2 gasket3 assembly basket4 crankcase5 injection adjusting device inside the

crankcase

Fig. 2

Fig. 1

Vacu

um

gen

erat

ion

Subject to change of illustrations and text!* For part matching and spare part references refer

to the catalogs in effect.

MSI Motor Service International GmbH • Hamburger Straße 15 • D-41540 Dormagen • Phone +49 (21 33) 267-100 • Fax +49 (21 33) 267-111www.msi-motor-service.com

Wear on the stroke curve(curved disk)

When replacing the vacuum pump shown here makesure that the stroke curve is not worn or damaged.Fig. 5 shows a stroke curve without wear, that is with asmooth and plane path.Fig. 6 shows a stroke curve with extreme wear andheavily used path (deep profile).If the slightest sign of wear is noticeable or for eachchange with previous drive damage, the lifting cammust be renewed in accordance with MB repairinstructions.

Note: The stroke curve - as shown in fig. 5 (for7.20607...) is no longer available as an individualspare part. Therefore the complete injection adjustingdevice must be replaced.

Important: If in the event of minimum wear of thelifting cam or in the event of deviations form the nomi-nal mounting dimensions, only the vacuum pump isrenewed, damage to the vacuum pump and possiblythe motor is preprogrammed.In such cases Pierburg will not accept any warranty.To decide whether or not a warranty case is justified,the stroke curve must be returned to Pierburg forevaluation in all instances.

Fig. 5

Fig. 6

Nominal values: according to fig. 7/table 8B and C are the installationdimensions of a correct vacuum pumpthat has been installed with the camsin their lower position, and a strokecurve in good condition.

Function check:As described in “Service Tips & InfoVacuum pumps”

Test equipment:Vacuum pump testerOrder reference no. 4.07370.06.0

Fig. 7 Schematic view1 vacuum pump 3 stroke curve2 roller 4 crankcase

Vacuum pump 7.20208... 7.20547... 7.20607...A-removal dimension 11,4±0,6 11,5±0,6 46,3±0,4B-pre-tension 0,5 to 2,7 0,7 to 2,3 0,15 to 3,21C-installation dimension 13±0,5 13 44,62±1,13D-stroke 10 10±0,1 12±0,05

Table 8 (Values in mm)

32

7.20208...7.20547... 7.20607...

12 3

4

B

DC

A

D

A

C

41

B