CAMPAIGN: STEEL DISC WHEEL CRACKS - (REPLACE ALL WHEELS)

SUBJECT: STEEL DISC WHEEL CRACKS

MODELS: 1985 Chevrolet P3--42 1986-1991 GMC & Chevrolet P3--42 1992 Chevrolet P3--42

TO: ALL GENERAL MOTORS DEALERS

General Motors of Canada Limited has determined that a defect which relates to motor vehicle safety exists in certain 1985 Chevrolet P3--42, 1986-1991 GMC & Chevrolet P3--42, and 1992 Chevrolet P3--42 Commercial Chassis model vehicles equipped with 6.2L diesel engines (RPO LLA), 1-beam front axles (RPO FS3), disc/drum power brakes (RPO JB8) and rated from 11,000# to 11,500# Gross Vehicle Weight (GVW) (RPO's C7E/C7G/9E6). Additionally, certain 1985- 1986 Chevrolet P3--42 Commercial Chassis model vehicles corrected under GM of Canada Product Safety Campaign 6A21, and equipped with disc/drum power brakes (RPO JB8) and rated at 11,000# to 11,500# GVW (RPO's C7E/C7G/9E6) are also involved.

These vehicles may exhibit cracking in the 19.5 x 6 front steel wheel disc. This cracking is circumferential, outside the bolt mounting circle, at or just underneath the clamp ring, and approximates the hub diameter. As the cracking progresses, it tends to become more visible and is likely to be noticed during routine maintenance. If the cracking should continue to go unnoticed until the centre portion of the disk is completely cracked, the wheel will still be mechanically held between the clamp ring and the hub. Eventually, if the warnings are ignored, the rim portion of the wheel could separate inboard and a vehicle crash could occur.

To prevent the possibility of this condition occurring, dealers are to replace the two (2) front wheels with newly designed wheels. Additionally, since periodic tire rotations are a common and recommended practice, the four (4) rear wheels (and spare wheel also if one exists) will also be replaced in the interest of customer satisfaction.

VEHICLES INVOLVED:

Involved are CERTAIN 1985 Chevrolet P3--42, 1986-1991 GMC & Chevrolet P3--42, and 1992 Chevrolet P3--42 Commercial Chassis model vehicles equipped with 6.2L diesel engines (RPO LL4), I-beam front axles (RPO FS3), disc/drum power brakes (RPO JB8) and rated from 11,000# to 11,500# Gross Vehicle Weight (GVW) (RPO's C7E/C7G/9E6). Additionally, CERTAIN 1985-1986 Chevrolet P3--42 Commercial Chassis model vehicles corrected under GM of Canada Product Safety Campaign 6A21, and equipped with disc/drum power brakes (RPO JB 8) and rated at 11,000# to 11,500# GVW (RPO'sC7E/C7G/9E6) are also involved.

Involved vehicles were built within the following VIN breakpoints:

Year Model Plant Plant Code From Through

1986 GMC P3--42 Detroit "3" SOP EOP 1987 GMC P3--42 Detroit "3" SOP EOP 1988 GMC P3--42 Detroit "3" SOP EOP 1989 GMC P3--42 Detroit "3" SOP EOP 1990 GMC P3--42 Detroit "3" SOP EOP 1991 GMC P3--42 Detroit "3" SOP EOP 1985 CHEV P3--42 Detroit "3" SOP EOP 1986 CHEV P3--42 Detroit "3" SOP EOP 1987 CREV P3--42 Detroit "3" SOP EOP 1988 CHEV P3--42 Detroit "3" SOP EOP 1989 CHEV P3--42 Detroit "3" SOP EOP 1990 CHEV P3--42 Detroit "3" SOP EOP 1991 CHEV P3--42 Detroit "3" SOP EOP 1992 CHEV P3--42 Detroit "3" SOP N3309609

and the following corrected 1985-1986 Chevrolet P3--42 model vehicles from 6A21:

1GDJP32JXF3505666 1GDJP32M2F3505557 1GBJP32J6F3340336 1GDJP32J0F3508849 1GDJP32M3F3510251 1GBJP32J7F3338451 1GDJP32J0F3509760 1GDJP32M8F3509726 1GBJP32J7F3340331 1GDJP32J1F3505510 1GDJP32M8F3510102 1GBJP32J8F3339088 1GDJP32J2F3507167 1GBJP32JXF3339044 1GBJP32J9F3340296 1GDJP32J4F3505498 1GBJP32J0F3328120 1GBJP32MXF3317703 1GDJP32J4F3505517 1GBJP32J0F3339067 1GBJP32MXF3317961 1GDJP32J4F3505663 1GBJP32J0F3340266 1GBJP32M7F3317979 1GDJP32J4F3505680 1GBJP32J0F3340316 1GBJP32M8F3318087 1GDJP32J5F3509351 1GBJP32J1F3338431 1GBJP32M9F3318213 1GDJP32J8F3505665 1GBJP32J2F3338440 1GBJP32M9F3318230 1GDJP32J8F3505892 1GBJP32J3F3338432 1GCJP32T3F3341330 1GDJP32J9F3508851 1GBJP32J3F3338463 1GDJP32J0G3501417 1GDJP32MXF3510098 1GBJP32J3F3339113 1GDJP32J2G3501418 1GDJP32M0F3505704 1GBJP32J4F3338438 1GDJP32M1F3510250 1GBJP32J4F3339041

All affected vehicles have been idenified 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:

All unsold new vehicles in dealer's possession and subject to this campaign must be held and inspected/repaired per the Service Procedure of this Campaign Bulletin before owners take possession of these vehicles.

Dealers are to perform this campaign on all involved vehicles at no charge to owners, regardless of kilometres traveled, 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, you are to ensure the campaign correction has been made before selling 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.

In summary, whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or is in your dealership for service in the future, please take the steps necessary to be sure the campaign correction has been made before selling or releasing the vehicle.

CAMPAIGN PROCEDURE:

Refer to Section 4 of the Service Policies and Procedures Manual for the detailed procedure on handlin, 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

15953256 Wheel Assembly - Wte 6 (7 If Equipped With Spare)

15953257 Wheel Assembly - Black 6 (7 If Equipped With Spare)

273487 Valve Stem 6 or 7

PARTS AND LABOUR CLAIM INFORMATION:

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

Repair Code Description Time Allowance

2A Replace 6 Wheels and Valve Stems 3.2

3A Replace 7 Wheels and Valve Stems 3.7

4A* Replace 4 Wheels and Valve Stems 2.2

Time allowance includes 0.1 hour for dealer administrative detail associated with this campaign. Repair Codes 2A, 3A and 4A include time for balancing wheels, and $2.00 for balance weights per wheel replaced. Parts credit will be based on dealer net plus 30% to cover parts handling.

Repair Code 4A is to be used only for the 1989 P3 vehicles, registered to Canada Post, which have had the two (2) front wheels replaced with the new design wheels. A list and a note are being sent to the affected five (5) dealers who have originally repaired these vehicles.

SERVICE PROCEDURE:

1. Replace 2 front and 4 rear wheel assemblies with appropriate colour (white or black) newly designed wheels. Also replace spare wheel if equipped (RPO's SNF or SNR). Follow instructions provided in section 3E of the appropriate model year service manual.

2. Install Campaign Identification Label.

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. Tis will indicate that the campaign has been completed.

General Motors of Canada bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer." They are written to inform these 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 your General Motors dealer for information on whether your vehicle may benefit from the information.

Dear General Motors Customer:

General Motors of Canada Limited has determined that a defect which relates to motor vehicle safety exists in certain 1985 Chevrolet P3--42, 1986-1991 GMC & Chevrolet P3--42, and 1992 Chevrolet P3--42 Commercial Chassis model vehicles equipped with 6.2L diesel engines, I-beam front axles, disc/drum power brakes and rated from 11,000# to 11,500# Gross Vehicle Weight (GVW). Additionally, certain 1985-1986 Chevrolet P3--42 Commercial Chassis model vehicles corrected under GM of Canada Product Safety Campaign 6A21, and equipped with disc/drum power brakes and rated at 11,000# to 11,5000# GVW are also involved.

These vehicles may exhibit cracking in the 19.5 x 6 front steel wheel disc. This cracking is circumferential, outside the bolt mounting circle, at or just underneath the clamp ring, and approximates the hub diameter. As the cracking progresses, it tends to become more visible and is likely to be noticed during routine maintenance. If the cracking should continue to go unnoticed until the centre portion of the disk is completely cracked, the wheel will still be mechanically held between the clamp ring and the hub. Eventually, if the warnings are ignored, the rim portion of the wheel could separate inboard and a vehicle crash could occur.

To prevent the possibility of this condition occurring, your dealer will replace the two (2) front wheels with newly designed wheels. Additionally, since periodic tire rotations are a common and recommended practice, the four (4) rear wheels (and spare wheel also if one exists) will also be replaced in the interest of customer satisfaction. This service will be provided for you at no charge.

Please contact your GM dealer as soon as possible to arrange a service date.

If parts are required, ask your dealer for details regarding their availability. If parts are not in stock, they can be ordered before scheduling your service date.

This letter idenifies your vehicle. Presentation of this letter to your dealer will assist their Service personnel in completing the necessary correction to your vehicle in the shortest possible time.

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

Customer Support Department General Motors of Canada Limited

Se reporter i la section

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.