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2001-2005 Duramax M/T Clutch Vibration

Description

Reference Number(s): 04-07-31-006B, Date of Issue: January 23, 2007
Affected Model(s): 2001-2005 Chevrolet Silverado; 2001-2005 GMC Sierra; with 6.6L Duramax(tm) Diesel (RPOs LB7, LLY) and Manual Transmission (RPO ML6)
Supersedes: This bulletin is being revised to update the part number for the dual-mass flywheel and remove the VIN breakpoints. Please discard Corporate Bulletin Number 04-07-31-006A (Section 07 – Transmission/Transaxle).

EXCESSIVE SHIFTER AND/OR ENGINE VIBRATION, BEARING GROWL AND/OR RATTLE TYPE NOISE WHILE DEPRESSING OR RELEASING CLUTCH PEDAL (REPLACE FLYWHEEL AND FLYWHEEL MOUNTING BOLTS)

Details

SERVICE INFORMATION

IMPORTANT: The VIN breakpoints were no longer needed because the new dual-mass flywheel will benefit all applications through model year 2005. To improve high mileage durability related to the issue outlined in this bulletin, a new Dual-Mass Flywheel, P/N 24238864, was released with the same balance characteristics as the pre-2006 flywheel, with 12 rivets instead of six. 

CONDITION

Some customers may comment on a bearing growl or rattle-type noise while depressing or releasing the clutch pedal. Some customers may comment on excessive shifter or engine vibration. In some cases, the excessive vibration may result in an injector balance rate fluctuation condition.

CAUSE

The steel clutch thrust washer may wear down the flywheel bushing prematurely, causing an excessive vibration condition.

DIAGNOSTIC TIPS

The bearing growl/rattle-type noise and or vibration is eliminated with the clutch fully engaged or disengaged.

CORRECTION

Replace the flywheel assembly with a Dual-Mass Flywheel,P/N 24238864  . Refer to the applicable SI procedure below.

IMPORTANT: The eight flywheel mounting bolts, P/N 97226124, must be replaced when service requires removal or replacement of the flywheel.
  • Engine Mechanical – 6.6L (LB7) – Engine Flywheel Replacement – Manual Transmission.
  • Engine Mechanical – 6.6L (LLY) – Engine Flywheel Replacement – Manual Transmission.

PARTS INFORMATION

Parts Information
Part Number Description Qty
24238864  Flywheel, Manual Trans., Dual-Mass 1
97226124 Bolts, Flywheel Mounting 8
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