Drive Belt Falls Off

Drive Belt Falls Off Diagnosis





Drive Belt Falls Off Diagnosis

Diagnostic Aids
Pulley misalignment can cause the drive belt to fall off the drive belt pulleys.
An extra load that is quickly applied and released by an accessory drive component may cause the drive belt to fall off the pulleys. Verify that the accessory drive components operate properly.
If the drive belt is the incorrect length, the drive belt tensioner may not keep the proper 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. A damaged drive belt may cause the drive belt to fall off. Inspect the belt for cuts, tears, sections of ribs missing, or damaged belt plys.
4. Misalignment of the pulleys may be caused from improper mounting of the accessory drive component, incorrect installation of a pulley, a bent pulley or pulley shaft. Test for a misaligned pulley using a straight edge in the pulley grooves across TWC or three pulleys. If a misaligned pulley is found refer to that accessory drive component for the proper repair procedure.
5. The inspection of the pulleys should include inspecting for any damage to the pulleys that would prevent the drive belt from not seating properly in all of the pulley grooves or on the smooth surface of a pulley.
6. Accessory drive component brackets that are bent or cracked could cause the drive belt to fall off.
7. Inspecting the fasteners can determine if a wrong bolt, nut, spacer, or washer was installed. Missing, loose, or wrong fasteners may cause pulley misalignment. Improper tightening of the fasteners may cause misalignment of the accessory component bracket.