K 3500 Truck 4WD V8-8.1L VIN G (2002)
Drive Belt: Technical Service Bulletins
Engine - Accessory Drive Belt Whine
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 03-06-01-011
Date: March, 2003
TECHNICAL
Subject:
Accessory Drive Belt Whine (Reposition Power Steering Pump Pulley)
Models:
2001-2003 Chevrolet Silverado, Suburban
2002-2003 Chevrolet Avalanche
2001-2003 GMC Sierra, Yukon XL
with 8.1L Engine (VIN G - RPO L18)
Condition
Some customer may comment on a whining-type noise that is audible in the vehicle's passenger compartment. This noise can typically be heard when the
vehicle is idling and may vary in pitch as engine RPM is increased.
Cause
The power steering pump pulley may be positioned too far inboard on the power steering pump.
Correction
Follow all of the current diagnostics in the Service Manual.
If the concern is not resolved, then reposition the power steering pump pulley on the power steering pump shaft. Following the applicable Service
Manual procedure and using J 25034-C, reposition the pulley outward from the end of the shaft by 1.0 mm (0.040 in.). This will leave the shaft recessed
in the pulley.
Warranty Information
For vehicles repaired under warranty, use the table shown.
Disclaimer
