CAMPAIGN: STEEL WHEELS. Oldsmobile Cutlass Supreme 1989

SUBJECT: STEEL WHEELS CRACKING

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

IT HAS BEEN DETERMINED THAT A NUMBER OF VEHICLES PREVIOUSLY INSPECTED UNDER THE ORIGINAL PRODUCT SAFETY RECALL CAMPAIGN 4D07 "STEEL WHEELS" ISSUED APRIL 1994, AND EXPANDED BY 4D07A ISSUED APRIL 1995, WILL REQUIRE REINSPECTION. ANEW SAFETY CAMPAIGN AND NEW LABOUR CODES ARE BEING ISSUED FOR ADMINISTRATIVE PURPOSES. A SECOND OWNER LETTER WELL BE SENT TO THE INVOLVED VEHICLE OWNERS.

VEHICLES PREVIOUSLY INSPECTED UNDER 4D07 THAT HAD LESS THAN FOUR WHEELS REPLACED ARE TO BE REINSPECTED. IF THE WHEEL CODES WERE NOTED ON THE DEALER REPAIR ORDER AND ARE NOT INCLUDED IN THIS CAMPAIGN, THE OWNER COULD BE CONTACTED BY TELEPHONE AND ADVISED THAT A TRIP TO THE DEALER IS NOT NECESSARY. FOR THOSE CUSTOMERS WHO HAD LESS THAN ALL FOUR WHEELS REPLACED AND THE CODES WERE NOT NOTED ON THE DEALER REPAIR ORDER, A RETURN TRIP TO THE SERVICE DEPARTMENT IS REQUIRED.

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 PGI [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 reinspect the manufacturing date codes stamped on each wheel to determine if the wheels were produced during a suspect period. 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 102931 231881 1990 Chev Lumina Oshawa #2 1 100300 182802 1988 Olds Cutlass Supreme Doraville D 344433 394848 1989 Olds Cutlass Supreme Doraville D 300036 372492 1990 Olds Cutlass Supreme Doraville D 360212 373563 1988 Pont Grand Prix Fairfax F 239499 286357 1989 Pont Grand Prix Fairfax F 200001 249798 1990 Pont Grand Prix Fairfax F 252305 262794 1988 Buick Regal Oshawa #2 1 480947 530075 1989 Buick Regal Oshawa #2 1 400026 458985 1990 Buick Regal Oshawa #2 1 430170 432588

IMPORTANT: ONLY CERTAIN VEHICLES ARE INVOLVED. 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 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 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.

DEALERS MAY ALSO CHECK ORIGINAL CAMPAIGN 4D07 REPAIR ORDERS FOR DISC DATE CODES INVOLVED, AND ADVISE OWNERS ON THEIR INVOLVED VEHICLE LIST, IF A TRIP TO THE DEALER IS NOT NECESSARY.

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 (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 receipt 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 Verified Wheel Codes on Prior Repair Order, .3 No Replacement Necessary, Advise Customer OR Inspect All Wheels - No Wheels Replaced 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, also includes time for replacement of valve stem and wheel balancing and also time allowance is based on use of torque stick as described in Service Procedure. Parts credit will be based on dealer net plus 30% to cover parts handling.

SERVICE PROCEDURE:

REINSPECTION

IMPORTANT: REINSPECTION MAY BE ACCOMPLISHED BY REVIEWING THE PREVIOUS CAMPAIGN 4D07 REPAIR ORDER IF THE WHEEL CODES WERE NOTED ON THE REPAIR ORDER. IF REPAIR ORDER REVIEW INDICATES EXPANDED CODES ARE STILL NOT INVOLVED, NOTIFY CUSTOMER AND IF VEHICLE IS AT DEALERSHIP, PROCEED TO STEP 7 AND INSTALL CAMPAIGN IDENTIFICATION LABEL.

REINSPECT ALL WHEEL LOCATIONS ON THE VEHICLE.

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 stamped on center portion of wheel in the following order (see illustration below).

A. Manufacturer, Plant and Year Codes.

B. Disc Code.

C. Day Code is = 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 V 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 8 U K 2 0 A K 2 8 V K 2 8 W

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

REPLACEMENT

5. As required by inspection, replace necessary wheels and balance. Use torque stick (Tool J-39544-15) and air 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 time as would normally be used without a torque stick.

6. Render all removed wheels unusable and scrap as instructed in the Parts Information section.

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:

In April 1994, General Motors of Canada Limited had decided 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.

Since the time that we made our original determination, an additional group of wheels has been identified as possibly exhibiting the same condition and a new campaign is being initiated to ensure that prior inspected 1988-1990 vehicles do not have these wheels.

We apologize for causing you this additional inconvenience, but to prevent this condition from occurring, your dealer will reinspect the manufacturing date codes stamped on each wheel of your vehicle to determine if the wheels were produced during a suspect period. 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

Object Number: 87413 Size: MF

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.