Diagnosing Problems - Symptom Reference - Noise

Proper lubrication during clutch installation can reduce the chances of noise problems down the road.
Squeals and growls are usually caused by worn or seized bearings. Chirping noises are usually caused by vibration somewhere in the release system.
Determine the source of bearing noise by setting the parking brake, putting the vehicle in neutral and starting the engine. Refer to the chart below to determine the source of the noise.

NOISE   SOURCE
Growling or grinding when the clutch is engaged. Transmission input shaft bearing
Squealing when the pedal is actuated and held. Pilot bearing or bushing
Chirping that intensifies when the pedal is slowly actuated. Release bearing
Chirping while idling in neutral that disappears when the pedal is slowly actuated. Fork/pivot ball contact point

Causes of Noise
External
Incorrect release system adjustment
Worn driveshaft or halfshaft components
Worn engine or transmission mounts
Broken cable self-adjuster
Worn or improperly lubricated pedal components

Internal
Worn or defective input shaft bearing
Defective or misaligned release bearing
Worn, misaligned or improperly-lubricated pilot bearing/bushing
Worn, bent or improperly lubricated fork
Worn input shaft
Improper disc installation
Misalignment
Damaged bearing retainer
Loose flywheel bolts
Damaged disc splines, worn stop pins or broken damper

 
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