TRANS OIL LEAK/THM200-4R FLYWHEEL COVER INTERFERENCE

EARLY PRODUCTION 1983 DEVILLES AND BROUGHAMS EQUIPPED WITH HT4100 ENGINES AND THM 200-4R TRANSMISSIONS MAY EXPERIENCE A TRANSMISSION OIL LEAK AT THE FRONT EDGE OF THE TRANSMISSION OIL PAN. THIS CONDITION CAN BE CAUSED BY INTERFERENCE BETWEEN THE BACK EDGE OF THE FLYWHEEL COVER AND THE FRONT EDGE OF THE TRANSMISSION OIL PAN FLANGE. BEGINNING AT VEHICLE BROADCAST NUMBER 173549, A NEW DESIGN FLYWHEEL COVER (P/N 1627822) WAS PUT INTO PRODUCTION TO ELIMINATE THE INTERFERENCE DESCRIBED ABOVE. VEHICLES EXHIBITING THIS CONDITION CAN BE CORRECTED BY REMOVING APPROXIMATELY 2-4MM (1/16-1/8 IN.) FROM THE TOP, REAR EDGE OF THE TWO RADII AND BACK EDGE ON THE FLYWHEEL COVER WITH A FILE OR GRINDER (FIGURE 1). BEFORE RESEALING THE TRANSMISSION OIL PAN WITH RTV (DO NOT USE A GASKET), MAKE CERTAIN ITS FLANGE IS NOT DEFORMED.

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.