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Makes 🢒 GMC_Truck 🢒 1989 🢒 GMC MD Conventional 97.5" 🢒 Bulletins 🢒 CAMPAIGN: DIST. CORROSION FORMING INSIDE DISTRIBUTOR CAP

CAMPAIGN: DIST. CORROSION FORMING INSIDE DISTRIBUTOR CAP

SUBJECT: DISTRIBUTOR CORROSION

MODELS: 1989-91 C6D, C7D, C5H, C6H, C7H WITH 6.0L (LSO) GAS ENGINES

General Motors has determined that certain 1989-91 C6D, C7D, C5H, C6H, and C7H trucks with 6.0L (LSO) fuel-injected gas engines may have corrosion forming in the distributor cap. This corrosion can eventually result in an engine misfire, causing an engine failure. To correct this condition, the existing distributor and/or cap will be replaced with new updated parts.

VEHICLES INVOLVED

Involved are certain 1989-91 C6D, C7D, C5H, C6H, and C7H trucks with 6.0L (LSO) fuel-injected gas engines built within the following VIN break- points:

Model Year Make From Through ---- ------- ---- -------- 1989 GMC SOP EOP Chevrolet SOP EOP

1990 GMC SOP EOP Chevrolet SOP EOP

1991 GMC SOP 1GDG6H1PXMJ519849 Chevrolet 1GBG6H1FXMJ109724

The specific vehicles involved in this campaign have been identified by Vehicle identification Number Computer Listings. These listings are furnished to all involved dealers with the campaign 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. Dealers are to correct all affected vehicles in new and used vehicle stock prior to their sale.

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 ensure 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 cor- rection according to instructions contained in this bulletin. If the name and address of the owner of an involved vehicle was unavailable to GMC Truck Division at the time of campaign initiation, the dealer must determine the owner's name and address from the dealership sales records. Please provide this information directly on the second copy of the listing next to the applicable VIN so that our records may be updated and the appropriate notification mailed to the owner. This second copy should then be submitted to the address listed below in the previously supplied yellow campaign envelopes.

GMC Truck Division General Motors Corporation 101 Union Street Plymouth, Michigan 48170

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by GMC Truck Division (see copy of owner letter included with this bulletin). A listing of owner names and addresses has been furnished to the involved dealers to enable dealers to follow up with owners involved in this campaign. This listing 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 this campaign.

SERVICE PROCEDURE

1990 C5H, C6H, and C7H Models Only

1. Install new distributor assembly P/N 1103920 and new distributor gasket P/N 10108445, per instructions on Page 6D4-5 of the 1990 Top- Kick/Kodiak Service Manual, X-9033.

NOTE: Save container for retum of old distributor assembly. Send via UPS, with copy of the repair order to:

DIY Group 500 South Beacon Street Muncie, IN 47302

2. Install "Campaign Identification Label".

1989-90 C6D and C7D, and 1991 C5H, C6H, and C7H Models Only

1. Install new distributor cap assembly P/N 10474757 and rotor assembly P/N 10496798, per instructions in the applicable service manual. Inspect for white powder in distributor assembly. If white powder blocks air vents, then replace entire distributor assembly.

2. Install "Campaign Identification Label".

PARTS INFORMATION

Parts are to be obtained from General Motors Service Parts Operation (GMSPO). To ensure that these parts will be obtained as soon as possible, they should be ordered from GMSPO on a C.I.O. order with no special instruction code but order under an advise code (2).

Part Number Description Quantity ------- --------------------- --------- 1103920 Distributor Assembly 1 10108445 Gasket-Distributor 1 10474757 Cap Assembly-Distributor 1 10496798 Rotor Assembly-Distributor 1

WARRANTY INFORMATION

Dealers should submit a warranty claim on each vehicle completed under this campaign.

Labor Operation *Time Trouble Number Description Allowance Code -------- ----------------- ---------- ------ V6790 Distributor-R & R .5 H r. 96 V6791 Inspect Distributor .4 H r. 96 Cap & Rotor-R & R

*For dealer to receive Administrative Time Allowance associated with this campaign, add 0.1 hour to the Labor Operation Time Allowance.

CAMPAIGN IDENTIFICATION LABEL

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 campaign number and five (5) digit dealer code of the dealer performing the campaign service. This infor- mation may be inserted with a typewriter or ball point 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.

ADMINISTRATIVE PROCEDURE

Procedures covering this campaign are outlined in Section V of your dealership's "GM Truck Claims Processing Manual" #P8919.

Dear GM Truck Owner:

General Motors has determined that certain 1989-91 C6D, C7D, C5H, C6H and C7H trucks with 6.0L (LSO) fuel-injected gas engines may have corrosion forming in the distributor cap. This corrosion can eventually result in an engine misfire, causing an engine failure.

To correct this condition, the existing distributor and/or cap will be replaced with new updated parts. This service will be completed for you at no charge.

Instructions for performing this service have been sent to your GM TopKick/Kodiak dealer. Please contact your GM TopKick/Kodiak dealer to arrange a service date. Refer to your GM TopKick/Kodiak Servicing Dealers booklet for the dealer nearest you. Please ask your dealer if you wish to know how much time will be needed to schedule, process and repair your vehicle.

Your GM TopKick/Kodiak dealer is best equipped to provide service to ensure your vehicle is corrected as promptly as possible. However, if you take your vehicle to your dealer on the agreed service date and they do not service this condition on that date or within five days, we recommend you contact your nearest GMC Truck Zone Office by telephone. The Zone Office will assist you and your dealer in getting your vehicle corrected. The telephone numbers of the Zone Offices are listed in your Warranty and Owner Assistance Information Manual.

After contacting your GM TopKick/Kodiak dealer and the Zone Office, if you are still not satisfied that we have done our best to remedy this condition without charge within a reasonable time, you may wish to write the Environmental Protection Division (EN-340F), United States Environmental Protection Agency, 401 M Street, S.W., Washington, D.C. 20460. To ensure your full protection under the emission warranty made applicable to your vehicle by Federal Law, and your right to participate in future recalls, it is recommended that you have your vehicle serviced as soon as possible. Failure to do so could legally be determined to be lack of proper maintenance of your vehicle. Also, your vehicle may fail a state or local emission inspection test if the recall work is not accomplished.

Should your dealer find that your emission system has been intentionally disabled, you will be asked it you wish the system to be restored so that it will function as designed. The cost of such restoration will be your responsibility.

The enclosed postage paid owner reply card identifies your vehicle. Presentation of this card to your GM TopKick/Kodiak dealer will assist in making the necessary correction to your vehicle in the shortest possible time. if you have sold or traded your vehicle, please furnish us complete name and address of the person you sold or traded your vehicle to and return the card to us.

We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction.

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.