For 1990-2009 cars

# IRREGULAR/PREMATURE TIRE WEAR REPAIR/ROTATION PROCEDURE

IRREGULAR/PREMATURE TIRE WEAR - ALL-SEASON TIRES

1985 TORONADO & 1985-86 CUTLASS CIERA REAR POSITION ONLY 1985 DELTA 88 & 1985-86 CUTLASS SUPREME FRONT POSITION ONLY

#### CONDITION

Some 1985 Toronado, 1985-86 Cutlass Ciera, 1985 Delta 88 and 1985-86 Cutlass Supreme models with original equipment All-Seasons tires ("M & S" following the TPC Spec. No.) may experience premature/irregular tire wear on non-drive axles. The wear may be identified as a cupping condition, usually on the outer shoulder of the tire. If allowed to continue, premature wear out of tread may occur.

#### CAUSE

The single, most contributing cause of this type of wear, except for abusive driving, is excessive toe-in. Lack of tire rotation and low inflation pressures will also exaggerate this condition.

#### VEHICLES INVOLVED

1985 Toronado and 1985-86 Cutlass Ciera models with All Seasons tires. REAR POSITION ONLY.

1985 Delta 88 and 1985-86 Cutlass Supreme models with All Seasons tires. FRONT POSITION ONLY.

#### SERVICE PROCEDURE

1. Tire wear should be inspected:

A. If only slight cupping is noticed, and the cross grooves in the tire's outside shoulder are still visible (see Figure 1), the tires should be rotated. The modified "X" pattern should be used (see Figure 2). This method will best equalize wear after a few thousand miles.

B. If the cupping or wear is severe, and/or the cross grooves in the outside shoulder are not visible, tire replacement may be necessary. Tire replacement, if required, will be made with the same brand and type tire as original equipment. These tires will be furnished on a "direct billed" basis to the dealer. Replacement tires must be obtained direct from the tire company by calling one of the following toll-free numbers:

Firestone - (216) 379-7096 (Collect)

General - 1-800-TIRE-FIX

Goodyear - 1-800-TIRE-TEC

Uniroyal - 1-800-231-5893 (Except Texas) 1-800-833-5906 (Texas)

Dealers must supply owner's name, VIN, mileage, dealer code, tire make, size, and description (i.e., white wall, brand name, etc.)

A maximum of two tires per vehicle will be provided on a "one time only" basis at no charge to the customer for the first 12,000 miles or 12 months.

2. A. On Delta 88 and Cutlass Supreme models whether tires are replaced or rotated, front-wheel alignment must be measured. For best tire wear, reset toe to ZERO. Camber and caster should be set to specification.

B. On Cutlass Ciera models measure rear axle toe-in. if toe-in is excessive, install rear axle shim kit, part no. 14094481, as explained in Dealer Technical Bulletin 86-T-12. This will reduce rear toe.

C. IMPORTANT ON ALL VEHICLES - to further help minimize tire wear, stress the importance of regular tire rotation to the owner. The modified "X" pattern at 7,500 miles is recommended. Also, point out the importance of proper inflation pressure, as listed on the Tire Placard on the driver's door edge.

3. Old tires must be scrapped by drilling four holes through the tire's serial number, located on the back sidewall.

Mount new tires with the yellow mark or orange label on the tire at the valve stem on the wheel. Balance and install on non-drive axle position.

#### CUSTOMER REIMBURSEMENT

Claims for customer reimbursement of previously paid repairs due to the described tire wear condition, accompanied by originals of paid receipts verifying vehicle mileage, may be submitted to the Zone office for review and consideration.

#### WARRANTY INFORMATION

For warranty purposes, use the following ONE APPLICABLE labor operation.

Operation* Operation Number ---------- ---------------- o Rotate 4 tires and align suspension or T-5108 install Shim Kit, part no. 14094881

#### Model Labor Description Labor Hours ----- ----------------- ----------- Cutlass Ciera Rotate Tires and Install 1.4 Shim Kit

Delta 88 Rotate Tires & Align 1.4 Front Suspension

Toronado Rotate Tires & Align Rear 1.2 Suspension

Operation* Operation Number ---------- ---------------- o Mount and balance 2 tires & align Firestone Tires T-5109 suspension or install Shim Kit General Tires T-5110 Goodyear Tires T-5111 Uniroyal Tires T-5112

#### Model Labor Description Labor Hours ----- ----------------- ----------- Cutlass Ciera Replace Rear Tires & Install 2.0 Shim Kit

Delta 88 Replace Front Tires & Align 2.0 Front Suspension

Toronado Replace Rear Tires & Align 1.7 Rear Suspension

List .2 hour for Administration on "Regular Hours" column of warranty claim.

List net cost of tires in "Sublet" column of warranty claim.

*NOTE: 1. Use Failure Code 06 (worn) for all above labor operations.

2. All of the above labor operations include an allowance for locking wheel covers.

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.