G8 V6-3.6L (2008)
Drive Belt Falls Off and Excessive Wear Diagnosis
Drive Belt Falls Off and Excessive Wear Diagnosis
Diagnostic Aids
If the drive belt repeatedly falls off the drive belt pulleys, this is because of pulley misalignment.
An extra load that is quickly applied or released by an accessory drive component may cause the drive belt to fall off the pulleys. Verify the accessory
drive components operate correctly.
If the drive belt is the incorrect length, the drive belt tensioner may not keep the correct tension on the drive belt.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This inspection is to verify the condition of the drive belt. Damage may have occurred to the drive belt when the drive belt fell off. The drive belt may
have been damaged, which caused the drive belt to fall off. Inspect the belt for cuts, tears, sections of ribs missing, or damaged belt plies.
4. Misalignment of the pulleys may be caused from incorrect 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 pulley grooves
across 2 or 3 pulleys. If a misaligned pulley is found, refer to that accessory drive component for the correct installation procedure of that pulley.
5. Inspecting the pulleys for being bent should include inspecting for a dent or other damage to the pulleys that may prevent the drive belt from not
seating correctly in all of the pulley grooves or on the smooth surface of a pulley when the back side of the belt is used to drive the pulley.
6. Accessory drive component brackets that are bent or cracked will let the drive belt fall off.
7. Inspecting the fasteners can address the possibility that a wrong bolt, nut, spacer, or washer was installed. Missing, loose, or wrong fasteners, may
cause pulley misalignment due to the bracket moving under load. Over tightening the fasteners may cause misalignment of the accessory drive
component bracket.