REAR MAIN SEAL INSTALLATION ENGINE OIL LEAK

The following is a revised rear main seal installation procedure for the engines listed above:

REAR MAIN SEAL INSTALLATION

(1) Clean the seal groove in the block and/or cap as necessary.

(2) After cleaning the groove, apply a THIN even coat, about two drops of bonding adhesive, GM P/N 1052621, Loctite 414, Fel-Pro 361 (Mighty Seal), or equivalent over the entire seal surface of the groove.

(3) WITHIN ONE (1) MINUTE install the seal using service manual procedures. (After one minute, the adhesive begins to cure and loses its bonding ability.) It is important to remember that most adhesives have a shelf life of about one year. However, the adhesive is considered usable if it flows freely from the container.

The above procedure should also be used on all PAST model diesel engines which utilize a rope type rear main seal.

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.