Answer to Question #189751 in Mechanical Engineering for Yashwanth Kumar

Question #189751

6. Briefly explain various troubles that may occur in a single plate dry type clutch system and bring out their causes. Explain the various failures, their causes and necessary remedial work on gear box

Expert's answer

Clutch slippage:

The clutch slips at the mating surfaces due to its inadequate frictional torque or engine power. It may be caused by the following factors;

  • Worn out linings of the clutch plate.
  • Greasy friction surface or clutch linings.
  • Locked or bound pedal travel.
  • Incorrect pedal adjustment such as free-play and travel on clutch pedal or release bearing.
  • Weak or broken pressure springs.
  • Burnt or scored surface of flywheel or pressure plate.
  • Floorboard or carpet incorrectly fitted.

2. Clutch drag or spin:

Also the inability to engage a gear when you press the pedal, resulting in a jammed driven plate. This is caused by the following;

  • Misalignment resulted due to the weight of the hanging gearbox on the spindle.
  • Broken or greasy clutch and pressure plate or flywheel.
  • Incorrect pedal adjustment – insufficient actual pedal travel, excessive free-play of the pedal or slave cylinder push rod.
  • Locked drive plate.
  • Broken or incorrectly adjusted release levers.
  • Damaged clutch cover, driven plate or friction or pressure plate.
  • Clutch release bearing defective.

3. Judder & vibrations:

This results in a sudden forward jump of the vehicle is caused by the following factors;

  • Greasy facing or friction surfaces.
  • Misalignment of gear box caused by distortion of the clutch housing.
  • Loose or badly worn linings.
  • Loose or protruding rivets.
  • Too much backlash in universal joints or rear axle.
  • Flywheel loose on crankshaft flange.
  • Estrangement of engine tie bar.
  • Uneven wear of friction surfaces.
  • Defective engine mountings allowing excessive torque reaction movement.
  • Bent splined shaft or driven plate.
  • Defective release mechanism.

4. Snatch or fierceness:

This is caused by the following;

  • Misalignment.
  • Locked pedal mechanism.
  • Greasy friction surfaces.
  • Worn out surfaces.

5. Tick or knock:

This is caused by the following;

  • Worn out pilot bearings.
  • Worn out hub splines due to misalignment.

6. Rattle in the clutch:

This is caused by;

  • Worn out release mechanism.
  • Damaged driven plate.
  • Loose release bearings.
  • Worn out transmission bearings.
  • Worn out or bent splined shaft.
  • Excessive backlash in transmission also causes clutch problem & defects.

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