CAMPAIGN: FRONT SHOCK ABSORBER NUTS LOOSEN REPLACE W/TORQUE

MODELS: 1988 CHEV. & GMC K MODEL TRUCKS

DEFECT INVOLVED

General Motors of Canada has determined that certain 1988 Light Duty K Model Trucks were built with incorrect front shock absorber upper and lower nuts installed. These nuts could loosen, resulting in some noise and if ignored or undetected by the operator, eventual shock absorber detachment at the upper mount will occur. A detached shock absorber could come i n contact with the front brake hose. This contact could result in a leak in the hose with a resulting loss of front brakes. A reduction of braking ability at a time when minimum stopping distance is required could result in a vehicle crash without prior warning.

To prevent this condition from occurring, it will be necessary to replace the existing free spinning nuts with prevailing torque nuts on all involved vehicles.

VEHICLES INVOLVED:

Involved are certain 1988 K Model Trucks built at Oshawa and within the following VIN breakpoints:

Assembly Plant From Throuqh

GMC Oshawa J1500016 J1501107

CHEV Oshawa J1100016 J1103659

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 for this campaign should be ordered through regular channels, as follows:

Part Number Descriotion Quantity

11500949 Bolt - 12mm x 1.75 x 80mm 2 11513580 Bolt - 12mm x 1.75 x 95rin 2 15531205 Washer 4 11500756 Nut - Prevailing Torque 4

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 Descriptiqn Time Allowancg

2A Replace Front Shock Absorber .7 Nuts & Bolts - Both Sides

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

SERVICE PROCEDURE:

- Raise and support vehicle.

- Remove tire and wheel assemblies.

- Remove and discard bolts, nuts and washers securing the shock absorber to its brackets, Figure No. 1.

- Fit new bolts in the direction shown in Figure No. 1.

- Torque nut on upper bolt to 94 N.m (70 lb. ft.) and torque the nut on the lower bolt to 75 N.m (55 lb. ft.).

- Repeat operation on opposite side of vehicle.

- Reinstall tire and wheel assemblies. Torque on a 6 or 8 stud single wheel is 123 N.m (90 lb. ft.).

- Lower vehicle.

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.