CAMPAIGN:STEEL WHEELS CRACKING

SUBJECT: STEEL WHEELS

THIS BULETIN IS A REISSUE OF 4D07 ISSUED MAY 1994. THE VEHICLES INVOLVED AND SERVICE PROCEDURE SECTIONS HAVE BEEN REVISED. SPECIFICALLY, THE VIN BREAKPOINTS HAVE EXPANDED AND ADDITIONAL WHEEL DISC CODES HAVE BEEN ADDED TO THE INVOLVED WHEEL POPULATION. PLEASE DISCARD ALL OLD COPIES OF BULLETIN 4D07; DCS MESSAGE DATE 09-15-94 AND DCS MESSAGE DATED 01/17/95.

REVISED INFORMATION IS INDICATED IN BOLD TYPE AND ITALICS.

Models: 1990 Chevrolet Lumina 1988-1990 Oldsmobile Cutlass Supreme 1988-1990 Pontiac Grand Prix, and 1988-1990 Buick Regal Equipped with steel wheels (RPO PB9 - 14" and RPO PG1 - 15")

TO: ALL GENERAL MOTORS DEALERS

General Motors of Canada Limited has determined that a defect which relates to motor vehicle safety exists in certain 1990 Chevrolet Lumina, 1988-90 Oldsmobile Cutlass Supreme, 1988-90 Pontiac Grand Prix and 1988-90 Buick Regal model vehicles equipped with steel wheels (RPO's PB9 [14"] and PG1 [15"]). These vehicles may exhibit a condition in which cracks develop in the wheel mounting surface and, should the cracks become severe enough, the wheel could completely separate from the vehicle. If this were to occur while the vehicle was in motion, steering and braking control of the vehicle could be affected, and a vehicle crash could result without prior warning.

To prevent this condition from occurring, dealers are to inspect the manufacturing date codes stamped on each wheel to determine if the wheels were produced during the period prior to our correcting this condition. Whenever a wheel falls within the specified date code range, dealers are to replace that wheel assembly.

VEHICLES INVOLVED:

Involved are certain 1990 Chevrolet Lumina, 1988-90 Oldsmobile Cutlass Supreme, 1988-90 Pontiac Grand Prix and 1988-90 Buick Regal model vehicles built within the following VIN breakpoints:

Year Model Plant Plant Code From Through

1990 Chev Lumina Oshawa #1 9 100103 245158 1990 Chev Lumina Oshawa #2 1 100001 189623

1988 Olds Cutlass Supreme Doraville D 344433 394848 1989 Olds Cutlass Supreme Doraville D 300036 378618 1990 Olds Cutlass Supreme Doraville D 337252 380237 1988 Pont Grand Prix Fairfax F 239499 286357 1989 Pont Grand Prix Fairfax F 200001 306688 1990 Pont Grand Prix Fairfax F 234909 272984 1988 Buick Regal Oshawa #2 1 480947 530075 1989 Buick Regal Oshawa #2 1 400026 467286 1990 Buick Regal Oshawa #2 1 417263 437528

NOTE: PLEASE CHECK DCS SCREEN 45 OR YOUR V.I.N. LISTING BEFORE PERFORMING CAMPAIGN TO ENSURE THAT THE VEHICLE IS AFFECTED. ONLY AFFECTED VIN'S WILL BE PAID.

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 shipping 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 kilometers traveled, age of vehicle, or ownership, from this time forward.

Owners of vehicles recently sold from your new vehicle inventory with no owner information indicated on the dealer listing, are to be contacted by the dealer, and arrangements made to make the required correction according to instructions contained in this bulletin. This could be done by mailing to such owners a copy of the owner letter accompanying this bulletin. Campaign follow- up cards should not be used for this purpose, since the owner may not as yet have received the notification letter.

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 handling Product Campaigns. Dealers are requested to complete the campaign on all transfers as soon as possible.

OWNER NOTIFICATION:

Additional involved vehicles are shown on the attached computer listing and owners of record have been notified by first class mail from General Motors (see copy of owner letter included with this bulletin). 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 ----------- ----------- ---------------- 9592409 14" Steel Wheel 1 to 4 (As Required)

9592147 15" Steel Wheel 1 to 4 (As Required)

9439866 Valve Stem 1 to 4 (As Required)

DISPOSITION OF REPLACED PARTS:

Technicians must return the affected parts to the Parts Department and acknowledgement of the used parts must be clearly indicated on the repair order as detailed in the current Service Policies and Procedures Manual.

Steel wheels removed from vehicles involved in this campaign may be scrapped immediately after rendering removed wheels unusable.

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 ----------- ----------- -------------- 1A Inspect All Wheels - No Wheels Replaced .3

2A Inspect All Wheels - 1 Wheel Replaced .6

3A Inspect All Wheels - 2 Wheels Replaced .8

4A Inspect All Wheels - 3 Wheels Replaced 1.0

5A Inspect All Wheels - All 4 Wheels Replaced 1.2

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:

NOTICE: ALL WHEEL LOCATIONS ON THE VEHICLE MUST BE INSPECTED.

1. Remove wheel cover, using care to avoid damage to cover and wheel surfaces.

2. Thoroughly clean outer surface of wheel using appropriate cleaning materials and tools.

Notice: Wheel must be cleaned to assure correct reading and interpretation of date code stamped on the center portion of wheel.

3. Read and record on repair order date code data stamped on center portion of wheel in the following order (see Figure on page 4).

a) Manufacturer, Plant and Year Codes.

b) Disc Code.

c) Day Code is not to be considered.

If codes match any of the combinations below or are unreadable/illegible, the wheel must be replaced.

MANUFACTURER (M) DISC MANUFACTURER (M) DISC PLANT (P) CODE PLANT (P) CODE YEAR (Y) YEAR (Y) -------------------------- ------------------------------ M P Y M P Y -------------------------- ------------------------------ K 2 8 J K 2 9 A K 2 8 K K 2 9 B K 2 8 L K 2 9 C K 2 8 M K 2 9 Y K 2 8 N K 2 9 EE K 2 8 O K 2 9 FF K 2 8 P K 2 9 GG K 2 8 Q K 2 9 JJ K 2 8 R K 2 9 KK K 2 8 S K 2 9 LL K 2 8 T K 2 0 A K 2 8 U K 2 8 V K 2 8 W

4. Repeat above procedure for remaining three wheels on vehicle.

5. As required by inspection, replace necessary wheels and balance. Use torque stick (Tool J-39544-15) and impact gun to tighten lug nuts to appropriate torque.

This should be done in two steps using the star pattern. First, snug nuts down by hand. Then using star pattern and a torque stick, tighten the wheel nuts to half the final torque. Finally, tighten the wheel nuts to specification using star pattern and torque stick. use same amount of impact wrench operating time as would normally be used without a torque stick.

6. Render all removed wheels unusable and scrap as required by campaign procedures.

7. 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. This will indicate that the campaign has been completed.

Dear General Motors Customer

General Motors of Canada Limited has determined that a defect which relates to motor vehicle safety exists in certain 1990 Chevrolet Lumina, 1988-90 Oldsmobile Cutlass Supreme, 1988-90 Pontiac Grand Prix and 1988-90 Buick Regal model vehicles equipped with steel wheels. These vehicles may exhibit a condition in which cracks develop in the wheel mounting surface and, should the cracks become severe enough, the wheel could completely separate from the vehicle. If this were to occur while the vehicle was in motion, steering and braking control of the vehicle could be affected, and a vehicle crash could result without prior warning.

To prevent this condition from occurring, your dealer will inspect the manufacturing date codes stamped on each wheel of your vehicle to determine if the wheels were produced during the period prior to our correcting this condition. Whenever a wheel falls within the specified date code range, your dealer will replace that wheel assembly.

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 identifies 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

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.