REAR MAIN CRANKSHAFT SEAL SERVICE SEAL INFORMATION

VEHICLES AFFECTED: All 1980-84 Vehicles Equipped With 2.8L V-6 Engines

If a 2.8L V6 engine exhibits oil leakage from the rear main crankshaft seal area it should be serviced with a one-piece (thin) lip seal.

This seal has helices on the lip along with a garter spring and is available as kit, P/N 14081761, installation iiistructions are included in the kit. The one-piece real replaces the two-piece seal, P/N 14069889, previously authorized in 1984 Product Service Bulletin 6-125 dated January 14, 1984.

The following sequence of repair and installation should be followed.

INSTALLATION OF NARROW ONE-PIECE CRANKSHAFT SEAL KIT, 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 Loctite 515 (or quivalent) sealaiit 993010 to O.D. of new seal. Seal should remain on installation tool as received during application of sealant.

6. Push seal 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 tcol in place, set crankshaft in engine.

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 993010 to the rear main bearing split line surface between the redr main seal and the oil pan seal groove. Install cap and main bearing. Torque bolts to 95 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 installations 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.