2012 NATEF Task Area A3

2012 NATEF Task Area A3 Manual Drive Trains & Axles

• A. Clutch Diagnosis & Repair

• B. Manual Transmission & Transaxle Diagnosis & Repair

• C. Drive Shaft, HalfShaft, Universal & CV Joint D & R

• D. Drive Axle Diagnosis & Repair

• E. FourWheel & AllWheel Drive Component D & R

Typical Rubric for NATEF Competencies 1 = Demonstrated Exposure and has observed the competency 2 = Applies the competency but only mastered a few essential attributes 3 = Capable of the competency but needs further practice 4 = Performs the competency satisfactorily [Proficient] 5 = Mastered the competency [Exemplary]

NATEF Task Area A3 Manual Drive Trains & Axles A. General Drive Train Diagnosis

Identify and interpret drive train concerns; determine necessary action. A3.A.1

P1


Research applicable vehicle and service information, fluid type, vehicle service history, service precautions, and technical service bulletins.

A3.A.2

P1


Check fluid condition; check for leaks; determine necessary action. A3.A.3

P1


Complete work order to include customer information, vehicle identifying information, verify customer concern, related service history, cause, & correction.

“Oldie”


Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, calibration decals).

“Oldie”


Drain and refill manual transmission/transaxle and final drive unit. A3.A.4

P1

NATEF Task Area A3 Manual Drive Trains & Axles B. Clutch Diagnosis & Repair

Diagnose clutch noise, binding, slippage, pulsation, and chatter; determine necessary action.

A3.B.1

P1


Inspect clutch pedal linkage, cables, automatic adjuster mechanisms, brackets, bushings, pivots, and springs; perform necessary action.

A3.B.2

P1


Inspect hydraulic clutch slave and master cylinders, lines, and hoses; determine necessary action.

“Oldie”


Inspect and replace clutch pressure plate assembly, clutch disc, release (throwout) bearing and linkage, and pilot bearing/bushing (as applicable).

A3.B.3

P1


Inspect and replace clutch pressure plate assembly and clutch disc. “Oldie”


Bleed clutch hydraulic system. A3.B.4

P1


Check and adjust clutch master cylinder fluid level; check system for leaks. A3.B.5

P1


Inspect flywheel and ring gear for wear and cracks; determine necessary action. A3.B.6

P1


Measure flywheel runout and crankshaft end play; determine necessary action. A3.B.7

P1


Inspect engine block, clutch (bell) housing, and transmission/transaxle case mating surfaces; determine necessary action.

“Oldie”

NATEF Task Area A3 Manual Drive Trains & Axles C. Transmission & Transaxle Diagnosis & Repair

Remove and reinstall transmission/transaxle. “Oldie”


Disassemble, clean, and reassemble transmission/transaxle components. “Oldie”


Inspect transmissionltransaxle case, extension housing, case mating surfaces, bores, bushings, and vents; perform necessary action.

“Oldie”


Inspect, adjust, and reinstall shift linkages, brackets, bushings, cables, pivots, and levers.

A3.C.1

P2


Describe the operational characteristics of an electronicallycontrolled manual transmission/transaxle.

A3.C.2

P3


Diagnose noise concerns through the application of transmission/transaxle power flow principles.

A3.C.3

P2


Diagnose hard shifting and jumping out of gear concerns; determine necessary action.

A3.C.4

P2


Diagnose transaxle final drive assembly noise and vibration concerns; determine necessary action.

A3.C.5

P3


Inspect and reinstall powertrain mounts. “Oldie”


Inspect and replace gaskets, seals, and sealants; inspect sealing surfaces. “Oldie”


Remove and replace transaxle final drive. “Oldie”


Inspect, adjust, and reinstall shift cover, forks, levers, grommets, shafts, sleeves, detent mechanism, interlocks, and springs.

“Oldie”


Measure endplay or preload (shim or spacer selection procedure) on transmission/transaxle shafts; perform necessary action.

“Oldie”


Measure endplay or preload (shim or spacer selection procedure) on transmission/transaxle shafts; perform necessary action.

“Oldie”


Inspect and reinstall speedometer drive gear, driven gear, vehicle speed sensor (VSS), and retainers.

“Oldie”


Remove, inspect, measure, adjust, and reinstall transaxle final drive pinion gears (spiders), shaft, side gears, side bearings, thrust washers, and case assembly.

“Oldie”


Inspect lubrication devices (oil pump or slingers); perform necessary action. “Oldie”


Inspect, test, and replace transmission & transaxle sensors and switches. “Oldie”

NATEF Task Area A3 Manual Drive Trains & Axles D. Drive Shaft, Half Shaft, Universal & ConstantVelocity Joint Diagnosis and Repair Diagnose constantvelocity (CV) joint noise and vibration concerns; determine necessary action.

A3.D.1

P1

NATEF Task Area A3 Manual Drive Trains & Axles D. Drive Shaft, Half Shaft, Universal & ConstantVelocity Joint Diagnosis and Repair Diagnose universal joint noise and vibration concerns; perform necessary action. A3.D.2

P2

NATEF Task Area A3 Manual Drive Trains & Axles D. Drive Shaft, Half Shaft, Universal & ConstantVelocity Joint Diagnosis and Repair Inspect, remove, and replace front wheel drive (FWD) bearings, hubs, and seals. A3.D.3

P1

NATEF Task Area A3 Manual Drive Trains & Axles D. Drive Shaft, Half Shaft, Universal & ConstantVelocity Joint Diagnosis and Repair Inspect, service, and replace shafts, yokes, boots, and universal/CV joints. A3.D.4

P1

NATEF Task Area A3 Manual Drive Trains & Axles D. Drive Shaft, Half Shaft, Universal & ConstantVelocity Joint Diagnosis and Repair Inspect, service, and replace shaft center support bearings. “Oldie”

NATEF Task Area A3 Manual Drive Trains & Axles D. Drive Shaft, Half Shaft, Universal & ConstantVelocity Joint Diagnosis and Repair Check shaft balance and phasing; measure shaft runout; measure and adjust driveline angles.

A3.D.5

P2

NATEF Task Area A3 Manual Drive Trains & Axles E. Drive Axle Diagnosis & Repair

1. Ring and Pinion Gears and Differential Case Assembly Diagnose noise and vibration concerns; determine necessary action. “Oldie”


1. Ring and Pinion Gears and Differential Case Assembly Clean and inspect differential housing; check for leaks; inspect housing vent. A3.E.1.1

P1


1. Ring and Pinion Gears and Differential Case Assembly Check and adjust differential housing fluid level. A3.E.1.2

P1


1. Ring and Pinion Gears and Differential Case Assembly Drain and refill differential housing. A3.E.1.3

P1


1. Ring and Pinion Gears and Differential Case Assembly Diagnose noise and vibration concerns; determine necessary action. A3.E.1.4

P2


1. Ring and Pinion Gears and Differential Case Assembly Inspect and replace companion flange and pinion seal; measure companion flange runout.

A3.E.1.5

P2


1. Ring and Pinion Gears and Differential Case Assembly Inspect ring gear and measure runout; determine necessary action. “Oldie”


1. Ring and Pinion Gears and Differential Case Assembly Remove, inspect, and reinstall drive pinion and ring gear. spacers, sleeves, and bearings.

“Oldie”


1. Ring and Pinion Gears and Differential Case Assembly Measure and adjust drive pinion depth.

Pinion Depth Definition: Position of piniongear relative to the ringgear centreline, expressed as either a mounting distance (measured from behind the pinion head to the centreline of the ringgear) or a checking distance (measured from the face of the pinion head to the centreline of the ring gear). Think of it as: How close the head of the pinion is to the centreline of the ringgear. Proper pinion depth makes sure the pinion teeth mesh with the middle of the teeth on the ringgear – between the top and the root. Increasing pinion depth moves the pinion closer to the centreline of the ringgear, moving the pinion “deeper” into ringgear teeth and reducing the checking distance. How Measured: The final determination of correct pinion depth can only be obtained by reading and interpreting the gear tooth contact pattern using gearmarking compound. There exist specialized tools for measuring pinion depth, but they are expensive, aren’t necessary, and are only used to calculate a starting point – final proof always lies in the contact pattern.

“Oldie”


1. Ring and Pinion Gears and Differential Case Assembly Measure and adjust drive pinion bearing preload. “Oldie”


1. Ring and Pinion Gears and Differential Case Assembly Measure and adjust side bearing preload and ring and pinion gear total backlash and backlash variation on a differential carrier assembly (threaded cup or shim types).

“Oldie”


1. Ring and Pinion Gears and Differential Case Assembly Check ring and pinion tooth contact patterns; perform necessary action. “Oldie”


1. Ring and Pinion Gears and Differential Case Assembly Disassemble, inspect, measure, and adjust or replace differential pinion gears (spiders), shaft, side gears, side bearings, thrust washers, and case.

“Oldie”


1. Ring and Pinion Gears and Differential Case Assembly Reassemble and reinstall differential case assembly; measure runout; determine necessary action.

“Oldie”

NATEF Task Area A3 Manual Drive Trains & Axles E. Drive Axle Diagnosis & Repair 2. Limited Slip Differential

Diagnose noise, slippage, and chatter concerns; determine necessary action. A3.E.2.1

P2


Inspect and flush differential housing; refill with correct lubricant. “Oldie”


Inspect and reinstall clutch (cone or plate) components. “Oldie”


Measure rotating torque; determine necessary action. “Oldie”


3. Drive Axle Shaft Inspect and replace drive axle wheel studs. A3.E.3.1

P1


3. Drive Axle Shaft Remove and replace drive axle shafts. A3.E.3.2

P1


3. Drive Axle Shaft Inspect and replace drive axle shaft seals, bearings, and retainers. A3.E.3.3

P2


3. Drive Axle Shaft Measure drive axle flange runout and shaft end play; determine necessary action. A3.E.3.4

P2


3. Drive Axle Shaft Diagnose drive axle shafts, bearings, and seals for noise, vibration, and fluid leakage concerns; determine necessary action.

A3.E.3.5

P2

NATEF Task Area A3 Manual Drive Trains & Axles F. Fourwheel Drive/Allwheel Drive Component Diagnosis and Repair

Inspect, adjust, and repair shifting controls (mechanical, electrical, and vacuum), bushings, mounts, levers, and brackets.

A3.F.1

P2


Inspect frontwheel bearings and locking hubs; perform necessary action(s). A3.F.2

P3


Check for leaks at drive assembly seals; check vents; check lube level. A3.F.3

P3


Identify concerns related to variations in tire circumference and/or final drive ratios.

A3.F.4

P3


Diagnose noise, vibration, and unusual steering concerns; determine necessary action.

A3.F.5

P3


Remove and reinstall transfer case. “Oldie”


Disassemble, service, and reassemble transfer case and components. “Oldie”


Disassemble, service, and reassemble transfer case and components. “Oldie”


Diagnose, test, adjust, and replace electrical/electronic components of fourwheel drive systems.

A3.F.6

P3

Documents

2012 NATEF Task Area A3