Engine - Drive Belt Noise/Wear
89chevy12GMC NUMBER: 89-T-22
GROUP: 6A - Engine Mechanical
DATE: February, 1989
CORPORATE
NUMBER: 836548
SUBJECT: BELT NOISE/WEAR
MODELS: 1988-89 C30, K30, AND R20 EQUIPPED WITH 7.4L ENG (VIN N)
Some C, K and R Trucks equipped with a 7.4L engine and serpentine belt system may have a belt noise/wear condition. This condition could be caused by a misaligned serpentine belt system. In a properly aligned system, the belt should be close to the center of the tensioner pulley, and the pulley should extend past belt edge both front and rear. If tensioner runs rearward of belt center, add 1/16" washer (P/N 120394) behind inboard rear leg
of generator bracket and cylinder head (See illustration). Rotate engine to reverify alignment. In cases of severe misalignment where pulley contacts 2/3 of the belt width, a 1/8" thick front end suspension shim at the same location will work. Parts are currently available from GMSPO.
Labor Operation Number: T7850
Labor Time: .4Hours