VEHICLE LEANS ON LEFT SIDE DE VILLE AND FLEETWOOD

VEHICLES AFFECTED: 1985-1987 DE VILLES AND FLEETWOODS (C)

Some 1985-1987 De Villes and Fleetwoods may appear to lean to the left. To permit uniform spring selection, De Villes and Fleetwoods are designed with a slight lean to the left. This is not enough tobe visibly apparent to most owners. Because of tolerance stack ups, however, some vehicles may lean to the left and result in an owner comment.Tolerance stack ups to the right will reduce the "designed in" lean to the left. Therefore, comments of lean to the right are not likely. If an owner comments of a left lean, new springs can be selected and installed as outlined in this bulletin to repair the vehicle.

Verifying Owner Concerns

With the vehicle on a level surface, measure heights at the wheel we 11 opening, see Figure 1. If the difference in measurements from the left to right side (front or rear) is .64 cm (1/4 inch) or less, following the procedures in this bulletin will not leve I the vehicle. It will only shift the lean to the right. Unde r these conditions, the owner should be told that the lean is within design specifications.

If the difference is greater than .64 cm (1/4 inch), use the following procedure to diagnose and repair the condition.

Initial Checks

Check tire pressures using the specifications given on the tire placard located on the driver's door. Adjust pressures as necessary.

Check for a tight or sticking front or rear suspension. With the aid of a helper, push down on the rear of the vehicle and release. Allow vehicle to settle and measure rear wheel well opening heights, see Figure 1. With the aid of a helper, lift the rear of the vehicle and release. Allow the vehicle to settle and measure rear wheel well opening heights. If the height is not within 1.27 cm (1/2 inch) of the first measurement, check for tight, sticking or binding suspension components. Loosen all suspension components and torque to proper specificatiohs given in Section 3 of the appropriate Service Information Manual. Repeat test. If height is still not within 1.27 cm (1/2 inch), check for a sticking strut assembly by replacing the strut assembly. Repeat this procedure for the front suspension.

Isolating the Lean to the Front or Rear Suspension

Measuring the wheel well opening heights may be different at either the front or rear only. However, front and rear springs do interact and it is necessary to isolate the lean to the front and rear of the vehicle.

To isolate the rear suspension, raise the front of the vehicle using a floor jack (see Figure 2 for proper jack location). Measure and record heights at the front wheel wells as shown i n Figure 4. Springs should be selected for the end of the vehicle with the greater difference in left and right wheel well opening heights.

Checking Trim Heights

There are two choices when selecting springs to repair a lean: one is to replace the taller spring with a shorter spring, the other is to replace the shorter spring with a taller spring. To correctly make this choice, the trim heights should be checked, see Figure 5. If the trim height is at tbe low end of the specification, the shorter spring should be replaced with a taller spring; if the trim height i s at the high end of the specification, the taller spring should be replaced by a shorter spring.

Selecting A Spring

Identify the spring installed on the vehicle by locating the tag on the spring and recording the spring code. Select a new shorter or longer spring with the same "rate" as the original spring. The spring available through service closest in length to original spring should be selected. Refer to Figure 6 for front springs and Figure 7 for rear springs.

Recheck Trim Heights

Install springs and recheck trim heights.

Check Bumper Heights

Remove everything except jack and. spare tire assembly from the trunk. Make sure vehicle has a full tank of fuel or add compensating weight (4 litres of fuel weighs 2.7 kg). Set tire pressures, refer to tire placard on the rear face of the driver's door. Jounce front and rear of vehicle. Check bumper heights as outlined in Figure 8.

Check Headlight Alignment

Check headlight alignment and-adjust if necessary.

Check Front and Rear Suspension Alignment

Check front and rear suspension alignment using the specificatins - listed in Section 3A of the appropriate Service Information Manual.

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.