REAR MAIN BEARING CAP O-RING INFORMATION

VEHICLES AFFECTED: 1985 S/T with 2.8L V6 Engines

The 1985 2.8L V6 engine uses an 'O' ring, P/N 14083381, to seal the oil pump transfer passage from the rear main bearing cap to the cylinder block. Any time the rear main bearing cap is removed, the 'O' ring must be replaced.

The 'O' ring fits into a machined groove in the cylinder block (see Figure 1). The rear main bearing cap must also be sealed to the block in the normal manner using anerobic sealer P/N 993010 or equivalent, plus the 'O' ring (see Figure 2).

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.