Engine - Rattle Type Noise From Rear
90pont14Bulletin Number: 90-6-33
Reference Number: 006102R
Publish Date: 6/90
Subject: RATTLE TYPE NOISE FROM REAR OF ENGINE (NEW PART)
Models 1988-90 BONNEVILLE MODELS
Affected: WITH 3800 V.6 ENGINE
A "tinny" rattling noise may be heard at the rear of the engine (hot engine) between idle and 1500 rpm's. This type of noise can sometimes be corrected by installing a larger timing chain dampener.
The dampener, part number 25535668, went into production engines used in Bonneville models on January 2, 1990. The date the engine was built can be found on a sticker on the rear valve cover and can be viewed by looking past the brake master cylinder from the driver's side of the car.
Parts are currently available from GMSPO.