WHEEL ALUM BOLT HUB CONTACT FIT VIB SUSP STRG

The cast aluminum wheels used on the 1991 Oldsmobile Bravada may require some special procedures for off -vehicle wheel balancing. This wheel has a raised embossment in the bolt hole area which interferes with some off-vehicle wheel balancer pressure cups. The purpose of this raised embossment is to provide a threaded hole for hub cap retention.

If the pressure cup is found to contact this embossment, the wheel will not locate properly on the balancer, and an inaccurate balance will result. DO NOT attempt to balance the wheel in this manner. If this condition is encountered, it is recommended that dealers contact the manufacturer of their off-vehicle wheel balancing equipment (or G.M. Dealer Equipment) to determine if a pressure cup that fits the 1991 Bravada wheel is available.

If no suitable pressure cup is available, the wheel may be located on the balancer using the front cone method. This will eliminate the need to use a pressure cup. To use the front cone method, the procedure below should be followed:

1 . Remove any cone or spring that may be on balancer shaft.

2. Place wheel on balancer shaft, with the back side of the wheel located directly against the balancer mounting plate.

3. Slide proper cone onto balancer shaft.

4. Secure cone and wheel in position with large wing nut. See the illustration below.

IMPORTANT: The front cone method should be used on this wheel only. It should not be used on any other General Motors wheels.

REMINDER: For off-vehicle balancing, all wheels should be located using the center wheel hole only. Use of the bolt holes for locating may result in inaccurate balancing.

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.