ENG. OIL LEAK - REAR MAIN SEAL (NEW REAR MAIN SEAL RELEASED)

Subject: ENGINE OIL LEAK AT REAR MAIN BEARING CAP SIDE SEAL (INSTALL NEW REAR MAIN BEARING CAP SEAL)

Models Affected: ALL MODELS WITH 90 DEG. V-6 "BUICK" ENGINE

A new rear main bearing cap side seal has been released to service all 90 degree V-6 "BUICK" engines. It will no longer be necessary to seal the cap to the block with R.T.V. sealer.

The part number for the new seal is 24500058. Parts are expected to be available on March 16, 1992. In case of limited inventory, parts will be placed on 400 control to waive VIP surcharges. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. However, the part will be shipped premium transportation at dealer's expense and all other order types will be placed on backorder until the 400 control is removed.

SERVICE PROCEDURE:

REMOVE: - Flywheel (1990-92 3800 TPI) - Oil Pan - #4 (Rear) Main Bearing Cap

CLEAN: - Side seal area of bearing cap and block

INSTALL: - New Rear Main Bearing Oil "Rope" Seal (All Except 3800 TPI) - #4 (Rear) Main Bearing Cap in block - Side seal, part number 24500058, with gray rubber seal material facing the block

NOTE: Use the seal "handle" to guide the seal into place and then tap the "handle" lightly to disengage the "handle" from the seal. Using the "handle" as a wedge, drive it between the cap and block behind the seal. This will wedge the seal against the block.

(See Section A-A and View B)

- New Rear Main Seal (1990-92 3800 TPI) - Oil Pan - Flywheel (1990-92 3800 TPI)

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.