CREAK/SQUEAK IN 'B' PILLER MODIFY MOUNT BELOW 'B' PILLER

SUBJECT: CREAK/SQUEAK NOISE IN "B" PILLAR

MODEL: 1991 S/T 2 AND 4 DOOR UTILITY VEHICLES

Some 1991 S/T utility vehicles may experience a creak or squeak in the "B" pillar post that is located directly behind the front door. This condition is caused by movement between the floor of the cab and the number two body mount located directly under the "B" pillar and may occur on either or both sides of the vehicle.

To correct the condition use the following procedure:

1. Remove the #2 body mount bolt.

2. Raise the body off the mount to obtain clearance between the floor and the top of the body mount.

3. Cut a 4 inch x 4 inch square of 1/32" thick teflon (obtain locally) and drill a 5/8" hole through the center. Insert this between the floor pan and the body mount and lower the body.

4. Clean the body mount bolt and apply Loctite 242 thread locking compound (GM P/N (12345382) or equivalent to the body mount bolt and retorque to 70-80 N.m. (52-59 lbs. ft.).

Notice: Concern exists that some insulating materials may compress over time resulting in a loss of torque to the body mount bolt. For this reason, teflon, 1/32 inch thick, and the thread locking compound on the bolt are being specified.

An alternative to preferred teflon material that can be found in most truck dealerships consists of using three washer pump shields P/N 22063244 referenced in GMC campaign bulletin 86-C-02. The part is also available through GMSPO.

Using this method, cut three sheets to size and locate a 5/8 inch hole in the center of each sheet. Place the three sheets between the floor pan and the mount and lower the body on the mount. Clean the body mount bolt and apply thread locking compound as described above and retorque bolt to 70-80 N.m. (52-59 lbs. ft.)

SERVICE PARTS INFORMATION

Part Number Description ---------------------- ------------------------------- 12345382 or equivalent Loctite 242 thread locking compound

22063244 or equivalent Washer pump shields teflon material

Parts are currently available from GMSPO or may be obtained locally.

WARRANTY INFORMATION

For vehicles repaired under warranty use:

Labor Operation: T7206 Labor Time: 0.4 hr. (right and/or left B pillar)

NOTE: Labor Operation is coded to base vehicle coverage in the warranty system.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.