VIB. RUMBLE AND/OR SQUEALING AT OR JUST ABOVE IDLE. Pontiac 6000 1987

For 1990-2009 cars

# VIB. RUMBLE AND/OR SQUEALING AT OR JUST ABOVE IDLE

#### Models Affected: 1987-1989 6000 WITH 2.5L

Some customers may experience a sound or "rumble" similar to that of a grounded-out exhaust pipe and/or squealing sound at, or just above idle.

The condition is generally limited to cars equipped with air conditioning and may be corrected by installing an improved tensioner assembly and the appropriate belt listed below. The repair procedure is detailed below:

#### Procedure:

--------- 1) Drain the coolant.

2) Remove the belt.

3) Remove the power steering pump assembly mount bolts and set aside.

4) Remove the existing tensioner assembly.

5) Clean the sealing surface on the cylinder block prior to installing the new tensioner.

6) Install a new tensioner assembly as follows:

1987 models without air conditioning - P/N 10066698 1988-89 models without air conditioning - P/N 10101362 1987-89 models with air conditioning - P/N 10101898

Torque bolts to 50 N-M (37 Ft-Lb)

7) Install the power steering pump assembly. Torque bolts to 27 N-m (20 Ft-Lb).

8) Install a new belt as follows:

Without air conditioning - P/N 10041195 With air conditioning - P/N 10101899

Parts are expected to be available on June 12, 1989. Until then normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. All parts will be placed on 400 control to waive VIP surcharges. However, the part will be shipped premium transportation at dealer's expense. All other order types will be canceled as incorrectly ordered while the 400 control is in place.

#### IMPORTANT: Refer to Section 6B of the Service Manual for proper belt routing.

9) Refill coolant system.

10) Start the engine and check for proper operation and leaks.

Labor Operation Number: J0680 Labor Time: 0.7 Hrs.

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.