Grand Prix V6-191 3.1L (1989)
Suspension Spring ( Coil / Leaf ): All Technical Service Bulletins
Suspension (Rear) - Thud/Clunk Noise
Bulletin Number:
91-3-18
Reference Number:
133403
Publish Date:
8/91
Subject:
REAR SUSPENSION AUXILIARY SPRING
THUD/CLUNK (LOWER ATTACHING BRACKET POSITIONING)
Models
Affected:
1989-91 GRAND PRIX MODELS
Condition:
Some 1989-91 Grand Prix models equipped with auxiliary rear springs may exhibit a thud/clunk type noise coming from the rear of the
vehicle that is audible in the passenger compartment. This condition is most apparent after a harsh/sharp road input such as a chuck-hole/
speed bump.
Cause:
Auxiliary rear spring lower attaching bracket not in full contact with rear spindle rod. Under certain operating conditions lower attaching
bracket may flex and contact spindle rod resulting in thud/clunk noise.
Correction:
Following service procedure indicated below, insure that the auxiliary rear spring lower brackets are properly seated on spindle rods.
Service Procedure:
1.
Raise vehicle and support in such a manner that rear suspension is extended in a full downward position.
2.
Inspect both right and left hand auxiliary spring lower brackets to insure they are in contact with spindle rods utilizing a .002" feeler gage.
3.
If a bracket is not in contact, loosen lower bracket to spindle rod bolt a maximum of two revolutions. Let bracket position itself on spindle rod and
re-torque bolt(s) to 46 N-m (36 lbs.ft.).
CAUTION: THE AUXILIARY SPRINGS ARE UNDER COMPRESSION AND BOLTS MUST NOT BE REMOVED. DOING SO MAY RESULT
IN PERSONAL INJURY.
4.
Lower vehicle.
Labor Operation Number:
T1752
Labor Time
: 0.3 Hours
