Silverado 3500 2WD V8-6.6L DSL Turbo (2006)
Drive Belt: Testing and Inspection
Drive Belt Chirping Diagnosis
Drive Belt Chirping Diagnosis
Diagnostic Aids
If a chirping noise occurs during engine shutdown, this is considered normal and is due to the engine's high compression. The chirping noise may be
intermittent due to moisture on the drive belt or the accessory drive pulleys. In order to duplicate the customer's concern, it may be necessary to spray
a small amount of water onto the drive belt. If spraying water onto the drive belt duplicates the symptom, cleaning the accessory belt pulleys may be
the most probable solution.
A loose or improper installation of a body or suspension component, or other items on the vehicle may also cause the chirping noise.
If a chirping noise occurs during engine shutdown, this is considered normal and is due to the engine's high compression.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. The chirping 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. Remove the drive belt and operate the engine for a few seconds, this will verify if the chirping noise is
related to the drive belt or not. With the drive belt removed the cooling fan will not operate and the engine may overheat. Also, DTC's may set
when the engine is operated with the drive belt removed.
4. Inspect the drive belt for signs of pilling. Pilling is the small balls, pills or strings in the drive belt grooves caused by the accumulation of rubber
dust.
6. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of an accessory drive component, or
the pulley may be bent inward or outward from a previous repair. Test for a misaligned pulley using a straight edge in the pulley grooves across 2
or 3 pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure for that
pulley.
10. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed.
12. Inspection of the accessory drive pulleys should include inspecting for bends, dents, or other damage to the pulleys that would prevent the drive
belt from seating properly in the pulley grooves, or on the smooth surface of the pulley when the back side of the drive belt is used to drive the
pulley.
14. Replacing the drive belt when it is not damaged or there is not excessive pilling will only be a temporary repair.
