CAMPAIGN: POWER STEERING PUMP BRACE- POSSIBLE REPLACE

Model and Year: 1987 CHEVROLET S/T TRUCKS EQUIPPED WITH 2.8L V6 (RPO LL2, VIN CODE R) AND POWER STEERING (RPO N40)

General Motors has determined that some 1987 Chevrolet 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 S/T model trucks equipped with 2.8L V6 engine (RPO LL2, VIN Code R) and power steering (RPO N40) and produced within the following VIN breakpoints:

PLANT FROM THROUGH ----- ---- ------- Moraine H2100012 H2169164 Pontiac H0100008 H0135774 Shreveport H8100001 H8162808

Involved vehicles have been identified by Vehicle Identification Number Computer Listings. Computer listings contain the complete Vehicle involved dealers with the campaign bulletin. Owner name and address data furnished will enable dealers to follow-up with owners involved in this campaign.

These listings may contain owner names and addresses obtained from State Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states. Accordingly, you are urged to limit the use of this listing to the follow-up necessary to complete this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by Chevrolet Motor Division (see copy of Owner Letter included with this bulletin).

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 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 correction according to instructions contained in this bulletin.

PARTS INFORMATION

Parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). To ensure these parts will be obtained as soon as possible, they should be ordered from GMSPO on a C.I.O. with no special instruction code, but on advise code (2).

PART NUMBER DESCRIPTION QUANTITY/VEHICLE

10087543 Brace - Power Steering Pump 1 10065558 Stud 1 11508279 Nut 1 14092956 * Bracket - Power Steering 1 - As required Pump Mounting

* 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.

SERVICE PROCEDURE

1. Inspect power steering pump brace. If vehicle is equipped with a new design brace (see Figure No. 1 and Figure No. 3), 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. 1, and remove brace.

3. Remove lower forward exhaust manifold attaching bolt and replace with stud P/N 10065558, see Figure No. 2.

4. Torque stud to 34 Nm (25 lb.ft), see Figure No. 3.

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 NM (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 NM (20 LB.FT).

8. Retorque lower power steering pump bracket to water pump bolt to 40 Nm (29 lb.ft), see Figure No. 3.

9. Install Campaign Identification Label.

CAMPAIGN IDENTIFICATION LABEL (Figure 4)

Each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin will require a "Campaign Identification Label." Each label provides a space to include the five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or ballpoint pen.

Each "Campaign Identification Label" is to be located on the radiator core support in an area which will be visible when the vehicle is brought in for periodic servicing by the owner.

Apply "Campaign Identification Label" only on a clean dry surface.

CLAIM INFORMATION

Submit a Product Campaign Claim with the information indicated below:

* FAILED PARTS LABOR LAB OTH REPAIR PERFORMED PC PART NO. ALLOW FC OP HRS HRS ---------------- -- -------- ----- -- ----- --- ---

Inspect For New Power 00 V4220 0.2 0.1 Steering Pump Brace No Further Action Required

Install New Power 3 10087543 ** 00 V4221 0.4 0.1 Steering Pump Brace Only (Vehicles Without A/C)

Install New Power 4 14092956 ** 00 V4222 0.8 0.1 Steering Pump Brace And Replace Mounting Bracket (Vehicles Without A/C)

Install New Power 3 10087543 ** 00 V4223 0.5 0.1 Steering Pump Brace Only (Vehicles with A/C)

Install New Power 4 14092956 ** 00 V4224 1.0 0.1 Steering Pump Brace And Replace Mounting Bracket (Vehicles With A/C)

* Campaign Administrative Allowance

** The "Parts Allowance" should be the sum total of the current GMSPO Dealer Net price plus 30% of all parts required for the repair.

Dealers will automatically receive the carrect labor and material allowance based on the labor operation performed.

Refer to the Chevrolet Claims Processing Manual for details on Product Campaign Claim submission.

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.