K 3500 Truck 4WD V8-6.6L DSL Turbo VIN 1 (2001)
Drive Belt: Testing and Inspection
Drive Belt Chirping
Drive Belt Chirping Diagnosis
Diagnostic Aids
The symptom may be intermittent due to moisture on the drive belt(s) or the pulleys. It may be necessary to spray a small amount of water on the drive
belt(s) in order to duplicate the customers concern. If spraying water on the drive belt(s) duplicates the symptom, cleaning the belt pulley may be the
probable solution.
A loose or improper installation of a body component, a suspension component, or other items of the vehicle may cause the chirping noise.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
2. The noise may not be engine related. This step is to verify that the engine is making the noise. If the engine is not making the noise do not proceed
further with this table.
3. The noise may be an internal engine noise. Removing the drive belt and operating the engine for a brief period will verify the noise is related to the
drive belt. When removing the drive belt(s) the water pump may not be operating and the engine may overheat. Also DTCs may set when the
engine is operating with the drive belt removed.
4. Inspect all drive belt pulleys for pilling. Pilling is the small balls or pills or it can be strings in the drive belt grooves from the accumulation of
rubber dust.
6. Misalignment oil: the pulleys may be caused from improper mounting of the accessory drive component, incorrect installation of the accessory
drive component pulley, or the pulley bent inward or outward from a previous repair. Test for a misaligned pulley using a straight edge in the
