Silverado 2500 4WD V8-6.6L DSL Turbo VIN 2 (2004)
length drive belt was installed, it may not be routed correctly and may be turning an accessory drive component in the incorrect direction.
7. Misalignment of the accessory drive pulleys may be caused from improper mounting or incorrect installation of a 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.
8. Inspect the accessory drive pulleys to verify that they are the correct diameter or width. Using a known good vehicle, compare the accessory drive
pulleys.
Drive Belt Vibration
Drive Belt Vibration Diagnosis
Diagnostic Aids
The accessory drive components can have an affect on engine vibration. An overcharged Air Conditioning (A/C) system, a power steering system
restriction, or the incorrect fluid, or an extra load placed on the generator are suggested items to inspect. To help identify an intermittent or an
improper condition, vary the loads on the accessory drive components.
Test Description
Steps 1 - 9