Causes of clutch noise


What can you do when the clutch is making noises or the clutch whistles? There are many different kinds of clutch noises. Whistling or whining from the clutch can be caused e.g. by the release bearing running off-center, an off-center input shaft, or a defective pilot bearing.

On the other hand, rattling noises may be due to load alterations if clutch disks are furnished with preliminary dampers. These noises do not impair the function or service life of the clutch.

Additional possible causes of the clutch making noises include installation of the wrong parts, or installation of the clutch disk in the wrong position. Clutch noises can also indicate a defect. The following questions are important for workshops: do the clutch noises occur during setting off or during disengaging? Do they occur when the clutch pedal is pressed, while pedaling, or in neutral position? Do noises occur when the clutch is engaged, while declutching, or at idle speed?

The clutch makes noises? The clutch whistles? Always check the following:

  • Correct part installed?
  • Correct installation position?
  • Pilot bearing installed and not worn or defective?
  • Condition (wear) of actuating system checked?

Torsional damper worn


Cause:

  • Low-revving driving style, i.e., driving at low speeds in high gear and full throttle
  • Extreme irregular engine operation
  • Worn joints in the driveline

Consequence:

Overloading of components

Worn torsional damper

Worn torsional damper Worn torsional damper

Cover plates torn off torsional damper


Cause:

  • Clutch bell housing and crankshaft housing flange not centered
  • Wobbling motion due to angular or parallel offset
  • Pilot bearing missing, transmission input shaft not guided
  • Excessive angular movement during transmission installation

Consequence:

Loose components brush adjacent parts.

Comment:

Also usually causes drag.

Cover plates torn off torsional damper

Cover plates of torsional damper torn off Cover plates torn off torsional damper

Wear-induced grooves on inner ring of clutch releaser


Cause:

  • Off-center clutch releaser contact due to parallel offset
  • Worn guide tube
  • Insufficient clutch releaser preload

Consequence:

  • Relative movements cause various types of noise.
  • Relative movements cause excessive temperature.

Comment:

This leads to grease loss and therefore premature failure of the bearing.

Wear-induced grooves on inner ring of clutch releaser

Inner ring of clutch releaser Wear-induced grooves on inner ring of clutch releaser

Hub spline no longer present


Cause:

  • Clutch bell housing and crankshaft housing flange not centered
  • Wobbling motion due to angular or parallel offset
  • Pilot bearing missing, transmission input shaft not guided

Consequence:

Loss of connection between engine and transmission

Comment:

Causes drag problems and noise in early stages.

Hub spline no longer present

Hub spline Hub spline no longer present

Cushion springs torn off around clutch disk


Cause:

  • Clutch bell housing and crankshaft housing flange not centered
  • Wobbling motion due to angular or parallel offset
  • Pilot bearing missing, transmission input shaft not guided
  • Excessive angular movement during transmission installation

Consequence:

  • Loss of connection between engine and transmission

Comment:

Causes drag problems and noise in early stages.

Cushion springs torn off around clutch disk

Clutch disk torn off Cushion springs torn off around clutch disk