Envoy 4WD V8-5.3L VIN M (2005)
Drive Belt Falls Off
Drive Belt Falls Off Diagnosis
Diagnostic Aids
If the drive belts repeatedly falls off the accessory drive pulleys, this may be caused by a pulley misalignment.
An extra load that is quickly applied or released by an accessory drive component may also cause the drive belts to fall off. Verify that the accessory
drive components are operating properly.
If the drive belts is the incorrect length, the drive belt tensioner may not maintain the proper tension on the drive belts.
Test Description
The numbers below refer to the steps in the diagnostic table.
2. This inspection is to verify the condition of the drive belts. Damage may have occurred to the drive belts when the drive belts fell off the pulley.
Inspect the drive belts for cuts, tears, sections of ribs missing, or damaged belt plies.
4. 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
two or three pulleys. If a misaligned pulley is found, refer to that accessory drive component for the proper removal and installation procedure of
that pulley.
