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All Technical Service Bulletins for Drive Belt:|88T36 > < Engine - Drive Belt Misalignment Diagnostics|Page 698
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Drive Belt: All Technical Service Bulletins
Drive Belt - Making Chirp Noise

Number:

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

All Technical Service Bulletins for Drive Belt:|88T36 > < Engine - Drive Belt Misalignment Diagnostics|Page 698