K 3500 Truck 4WD V8-6.6L DSL Turbo VIN 1 (2001)
Flywheel: All Technical Service Bulletins
M/T - Shifter Vibration/Growl/Rattle Depressing Clutch
Bulletin No.: 04-07-31-006B
Date: January 23, 2007
TECHNICAL
Subject:
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)
Models:
2001-2005 Chevrolet Silverado
2001-2005 GMC Sierra
with 6.6L Duramax(TM) Diesel (RPOs LB7, LLY) and Manual Transmission (RPO ML6)
Supercede:
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).
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.
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
Warranty Information
