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
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.
- Engine Mechanical – 6.6L (LB7) – Engine Flywheel Replacement – Manual Transmission.
- Engine Mechanical – 6.6L (LLY) – Engine Flywheel Replacement – Manual Transmission.
PARTS INFORMATION
| Part Number | Description | Qty |
| 24238864 | Flywheel, Manual Trans., Dual-Mass | 1 |
| 97226124 | Bolts, Flywheel Mounting | 8 |