REAR MAIN SEAL REPLACEMENT NEW SERVICE PROCEDURE

A new one-piece rear main crankshaft seal has been put into production on 1984 2.0L L4 engines. This seal requires a new service procedure as detailed below.

The new rear main seal has demonstrated to be successful in correcting rear main seal oil leaks on 2.0L L4 engines. For this reason, it should be used to service 1983 2.01,L2 engines as well as 1984 engines. The use of the two-piece rear main seal on 1983 models should be discontinued in favor of the 1984 one-piece design.

A repair kit, P/N 14081761, is available through WDDGM and includes the one-piece seal, an installation tool, and the necessary instructions.

Before replacing the rear main oil seal, care should be taken to determine the exact source of the leak.

The following procedure should be used when replacement of the rear oil seal is necessary.

INSTALLATION OF NARROW ONE-PIECE CRANKSHAFT SEAL, P/N 14081761

1. Remove engine and mount on stand in inverted position with coolant and oil drained.

2. Remove crankshaft per service manual instructions.

3. With crankshaft out of engine, remove oil seal and clean all sealant and foreign material from cylinder case, bearing cap and crankshaft using a non-abrasive cleaning solvent.

4. Inspect components for nicks, burrs, scratches and machining defects at all sealing and mating surfaces and crankshaft journal.

5. Apply a very thin coat (approximately 1.0mm bead) of anaerobic sealant 1052357 to O.D. of new seal. Seal should remain on installation tool as received during application of sealant.

6. Push seat and tool assembly onto the rear of crankshaft as far as it will go. Position the tool so that the arrow points toward the cylinder and case assembly as shown in the instructions.

7. With the tool in place, set crankshaft in engine. Align seal in case groove.

8. Remove the installation tool, rotating as shown, and discard.

9. Apply a light coat of engine oil on crankshaft journals.

10. Apply a 1.0mm bead of anaerobic sealant 1052357 to the rear main bearing split line surface between the rear main seal and the oil pan seal groove. Install cap and main bearing. Torque bolts to 96 N.m (70 ft. lbs.).

11. Install remaining caps and main bearings.Torque bolts to 95 N.m (70 ft. lbs.).

12. Install connecting rod bearings and caps. Torque to specifications.

13. Complete engine assembly and installation per Service Manual.

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.