CAMPAIGN: POWER STEERING PUMP BRACE- POSSIBLE REPLACE

POWER STEERING PUMP SUPPORT BRACE

1987 S/T Trucks with 2.8L (LL2) V-6 and Power Steering (N40)

General Motors of Canada has determined that some 1987 Chevrolet and GMC S/T model trucks may experience fracture of the power steering pump support brace. This condition can in turn lead to possible fracture of the power steering pump mounting bracket and/or loss of the serpentine accessory drive belt. Loss of the serpentine drive belt would result in loss of air conditioning, generator, power steering assist and water pump operation.

To correct this condition, the power steering pump support brace will be inspected and, if necessary, replaced with a new design brace. The power steering pump mounting bracket will also be inspected and replaced as required on all involved vehicles.

VEHICLES INVOLVED:

Involved are certain 1987 Chevrolet and GMC S/T model trucks equipped with 2.8L V-6 Engine (RPO LL2, VIN Code R) and power steering (RPO N40) and produced within the following VIN breakpoints:

Plant From Through ----- ---- ------- CHEV Pontiac West sop H0135774 Moraine sop H2169164 Shreveport sop H8162808

Gmc Pontiac West sop H0510375 Moraine sop H2515862 Shreveport sop H8518729

All affected vehicles have been identified by the VIN listing provided to involved Dealers with this bulletin. Any Dealer not receiving a listing was not shipped any of the affected vehicles.

DEALER CAMPAIGN RESPONSIBILITY:

Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time forward.

Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your Dealership for service in the future, you should take the steps necessary to be sure the campaign correction has been made before reselling or releasing the vehicle.

Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the Dealer, and arrangements made to make the required modification according to instructions contained in this bulletin.

CAMPAIGN PROCEDURE:

Refer to Section 4 of the Service Policies and Procedures Manual for the detailed procedure on handling Product Campaigns. Dealers are requested to complete the campaign on all transfers as soon as possible.

OWNER NOTIFICATION:

All owners of record at the time of campaign release are shown on the attached computer listing and have been notified by first class mail from General Motors. The listings provided are for campaign activity only and should not be used for any other purpose.

PARTS INFORMATION:

Parts required to complete this campaign should be ordered through regular channels, as follows:

Part Number Description Quantity/Vehicle ----------- ----------- ---------------- 10087543 Brace - Power Steering Pump 1 10065558 Stud 1 11508279 Nut 1 14092956* Bracket - Power Steering Pump Mounting 1 - As Required

* It is estimated that only approximately 3.5% of the vehicles involved may require P/N 14092956 Power Steering Pump Mounting Bracket. Please order parts accordingly, based on attached involved vehicle listing.

PARTS AND LABOUR CLAIM INFORMATION:

Credit for the campaign work performed will be paid upon receipt of a properly completed campaign claim card, RAPID terminal or DCS transmission in accordance with the following:

Repair Code Description Time Allowance ----------- ----------- -------------- 1A Inspect for New Power Steering .3 Pump Brace No Further Action Required

2A Install New Power Steering .5 Pump Brace Only (Vehicles Without A/C) P/N 10087543

3A Install New Power Steering .9 Pump Brace and Replace Mounting Bracket (Vehicles Without A/C) P/N 14092956

4A Install New Power Steering .6 Pump Brace Only (Vehicles With A/C) P/N 10087543

5A Install New Power Steering 1.1 Pump Brace and Replace Mounting Bracket (Vehicles With A/C) P/N 14092956

Time allowance includes 0.1 hour for Dealer administrative detail associated with this campaign. Parts credit will be based on Dealer net plus 30% to cover parts handling.

SERVICE PROCEDURE:

1. Inspect power steering pump brace. If vehicle is equipped with a new design brace (see Figure No. 1A and Figure No. 2), no further service is required, proceed to step 9. If vehicle is equipped with original design brace, proceed with steps below.

2. Remove two (2) nuts from power steering pump brace, see Figure No. 1A, and remove brace.

3. Remove lower forward exhaust manifold attaching bolt and replace with stud P/N 10065558, see Figure No. 1B.

4. Torque stud to 34 N.m (25 lb. ft.), see Figure No. 2.

5. Inspect power steering pump mounting bracket. If bracket is cracked or broken, it must be replaced. Reference 1987 S/T Service Manual (ST-369- 87) Section 3B3, for power steering pump mounting bracket replacement.

6. Attach new power steering pump brace on power steering pump and manifold studs. Install nuts on pump and manifold studs and HAND TIGHTEN ONLY.

7. Torque nut on rear of power steering pump to 45 N.m (33 lb. ft.)

IT IS NECESSARY TO TORQUE NUT ON REAR OF POWER STEERING Pump FIRST TO CORRECTLY POSITION BRACE. AFTER THIS HAS BEEN ACCOMPLISHED, TORQUE REMAINING TWO (2) NUTS TO 28 N.m (20 LB. FT.).

8. Retorque lower power steering pump bracket to water pump bolt to 40 N.m (29 lb. ft.), see Figure No. 2.

INSTALLATION OF CAMPAIGN IDENTIFICATION LABEL

Clean surface of radiator upper mounting panel and apply a Campaign Identification Label. Make sure the correct campaign number is inserted on the label. This will indicate that the campaign has been completed.

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.