Answer to Question #189751 in Mechanical Engineering for Yashwanth Kumar

Question

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

Answer 1

$1.$ 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.