Bearing Noise

^ Clutch release bearing. A whirring, grating or grinding noise as clutch pedal is depressed. Noise usually continues until the clutch pedal is fully released.

Possible causes: Misaligned clutch housing, lack of lubrication, damaged or misaligned clutch cover release fingers, driving with foot resting on the clutch pedal, bad bearing.

^ Pilot bushing. A squealing, howling, or elephant-type trumpeting noise which is most noticeable when the engine is cold. The noise occurs during the first few inches of clutch pedal travel as the pedal is being released (partial clutch engagement) with the transmission in gear. The noise may also occur in cold weather when the clutch pedal is fully depressed.

Possible causes: Misaligned clutch housing, lack of lubrication.

^ Input shaft bearing, mainshaft pilot roller bearings, countershaft bearings. A whirring, grating or grinding noise in neutral with the clutch pedal released. Noise will cease when the clutch pedal is completely depressed and the transmission shifted into any gear.

Possible causes: Lack of lubrication, misaligned clutch housing, countershaft end play out of specification (.001 to .005 inch), bad bearing.

^ Mainshaft bearings.

A whirring, grating, or grinding noise, noise level increases under load as speed increases.

Possible causes: Lack of lubrication, misaligned clutch housing, bad bearing.

^ First or reverse gear needle bearings.

A whirring, grating, or grinding noise, noise is present in all gears and increases as speed increases. The noise ceases only when the transmission is shifted into first gear or reverse gear. If the noise ceases in first gear only suspect first gear bearings. If the noise ceases in reverse gear only suspect the reverse gear or reverse idler gear bearings.

Possible causes: Lack of lubrication, Dirt, chips, foreign material in transmission, bad bearing.