Drive Belt - Making Chirp Noise
88chevy19Number: 88-291-7A
Section: 7A
Date: JULY, 1988
Subject: SERPENTINE BELT CHIRP
Model and Year: 1988 S/T TRUCKS W/4.3L (VIN CODE Z) ENGINE
TO: ALL CHEVROLET DEALERS
Some owners of 1988 4.3L S/T trucks may experience a chirping noise from the accessory drive belt. "Belt Chirp" is a short duration, intermittent, high pitched sound and should not be confused with belt "squeal", which is continuous in nature.
This condition can be addressed by aligning the power steering pump pulley 3/4 mm plus or minus 1/4 mm (.030" plus or minus .010") forward of flush with the power steering pump shaft (See Illustration). A wheel puller should be used to perform this realignment.
Labor Operation Number: T7460
Labor Time : .3 Hours