21 90 ... Troubleshooting the clutch
WARNING: This page is about a different variant/trim than selected.
TROUBLESHOOTING CHART
| Fault |
Cause |
Remedy |
| Clutch slipping |
- Clutch pressure too low.
- Lining too heavily worn.
- Lining oiled-
Leaks:
- Engine
Crankshaft radial seal at front and rear incl. end cover, oil sump, cylinder head gasket, cylinder head, oil filler cap, timing case cover, flywheel mounting bolts
- Cooling system
Hoses and connections, heating valves, sealing plugs on engine block
- Steering unit
Steering gear, servo pump, hydraulic lines and connections
- Transmission
Drive shaft radial seal, sealing plugs of countershaft
- Release bearing
- Clutch was overheated.
- Clutch is not an original-equipment BMW part.
|
- Replace clutch
Refer to 21 21 500 .
- Replace clutch plate
Refer to 21 21 500 .
- Carefully rectify leaks, clean oil contamination and replace clutch plate
Refer to 21 21 500 .
- Replace clutch
Refer to 21 21 500 .
- Install original-equipment BMW part.
|
| Clutch stick/slip |
- Lining not acc. to specification.
- Lining oiled:
Causes: refer to " Clutch Slipping, Point C"
- Release unit presses on one side.
- Clutch presses at an angle.
- Crankshaft does not align with transmission input shaft.
- Engine and transmission suspension defective.
- Clutch plate not an original-equipment BMW part.
- Engine, speed characteristics not O.K.
- Engine management not OK (particularly on diesel engine).
|
- Replace clutch plate
Refer to 21 21 500 .
- Replace clutch plate
Refer to 21 21 500 .
- Check release lever.
- Replace clutch
Refer to 21 21 500 .
- Check engine/transmission contact face, adapter sleeves and cover plate for damage.
- Replace engine and transmission suspension.
- Install original-equipment BMW part.
- Eliminate causes according to engine test.
- Check engine control unit.
|
| Clutch releases poorly (Gear difficult to engage) |
|
Check BMW service bulletins in On-Demand |
| Clutch does not separate (Gear cannot be engaged) |
- Lining of clutch plate broken.
- Lining rusted onto flywheel.
- Guide bearing for transmission input shaft in crankshaft defective.
- Leak in clutch hydraulic system.
- Tangential leaf springs of clutch bent down.
- Release unit binds on guide sleeve.
|
- Replace clutch plate
Refer to 21 21 500 .
- Evenly sand flywheel with sandpaper (120-180 grain) and replace clutch plate.
- Replace guide bearing in crankshaft.
- Replace faulty parts and bleed clutch hydraulics
Refer to 21 00 006 .
- Replace clutch
Refer to 21 21 500 .
- Clean guide sleeve, remove and install release unit
Refer to 21 21 500 .
|
TROUBLESHOOTING CHART
| Fault |
Cause |
Remedy |
| Clutch noise |
- Imbalance of clutch and clutch plate too great.
- Torsional-vibration damper defective.
- Release unit defective.
- Guide bearing for transmission input shaft in crankshaft defective.
- Clutch rivet connection loose.
|
- Replace clutch/clutch plate
Refer to 21 21 500 .
- Replace clutch plate
Refer to 21 21 500 .
or if necessary replace dualmass flywheel,
- Replace release unit
Refer to 21 21 500 .
- Replace guide bearing in crankshaft.
- Replace clutch
Refer to 21 21 500 .
|