C 3500 Truck 2WD V8-6.6L DSL Turbo VIN 1 (2002)
Drive Belt: All Technical Service Bulletins
Engine - Serpentine Belt Identification/Diagnosis
File In Section: 06 Engine/Propulsion System
Bulletin No.: 02-06-01-010A
Date: June, 2003
INFORMATION
Subject:
Serpentine Belt Identification and Diagnosis
Models:
2001-2003 Chevrolet Silverado
2001-2003 GMC Sierra
2003 Chevrolet C4500/5500 Medium Duty Truck
2003 GMC C4500/5500 Medium Duty Truck
with 6.6L Duramax(TM) Diesel Engine (VIN 1 - RPO LB7)
This bulletin is being revised to add additional models and model years. Please discard Corporate Bulletin Number 02-06-01-010 (Section 06 - Engine).
The tables shown will assist the dealer in selecting the correct belt to install based on the engine configuration.
When looking at a belt, the part number, the broadcast code (BCC) and the belt spec-length are printed on the smooth side in white letters.
Diagnosis
The following information may assist the dealer with diagnosis of different belt conditions or failure modes. Belt conditions may be generalized into two
typical symptoms: shredding or belt wear, and noise. For shredding or wear conditions pulley alignment a wrong idler pulley or foreign objects are the
most found causes. Inspect all pulleys for proper alignment. Visually inspect that the belt is going according to the correct routing and that the correct
pulleys are installed. Smooth pulleys should ride against the smooth side of the belt and ribbed pulleys should ride against the ribbed side of the belt.
The first issue with noise is a squeak at engine shutdown. This is a normal condition and no repairs should be made. Because of the higher cylinder
pressures in a diesel engine, the engine stops faster than a gasoline powered engine. While the engine itself stops quickly, the other accessories have
