K 1500 Suburban 4WD V8-4.8L VIN V (2003)
or the pulley may be bent inward or outward from a previous repair. Test for a misaligned accessory drive 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 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 pulley(s) should include inspecting for bends, dents, or other damage to the pulley(s) that would prevent the drive
belt(s) 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(s) when it is not damaged or there is not excessive pilling will only be a temporary repair.
Drive Belt Excessive Wear
Drive Belt Excessive Wear Diagnosis
Diagnostic Aids
Excessive wear on a drive belt(s) is usually caused by incorrect installation or the incorrect drive belt(s) for the application.
Minor misalignment of the accessory drive pulley(s) will not cause excessive wear, but will probably cause the drive belt(s) to make a noise or fall off.
Excessive misalignment of the accessory drive pulley(s) will cause excessive wear and may also make the drive belt(s) fall off.
Drive Belt Excessive Wear Diagnosis
Test Description
The number(s) below refer to the step(s) in the diagnostic table.
2. This inspection is to verify that the drive belt(s) is correctly installed on all of the accessory drive pulleys. Wear on the drive belt(s) may be caused
by mix-positioning the drive belt(s) by one or more grooves on a pulley(s).
3. The installation of a drive belt(s) that is too wide or too narrow will cause wear on the drive belt(s). The drive belt(s) ribs should match all of the
grooves on the pulleys.
4. This inspection is to verify that the drive belt(s) is not contacting any part of the engine or body while the engine is operating. There should be
sufficient clearance when the accessory drive components load varies. The drive belt(s) should not come in contact with an engine or a body
component when snapping the throttle.
Drive Belt Falls Off
Drive Belt Falls Off Diagnosis
Diagnostic Aids
If the drive belt(s) repeatedly falls off the accessory drive pulley(s), 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 belt(s) to fall off. Verify that the accessory
drive component(s) are operating properly.
