REAR MAIN SEAL REPLACEMENT 1984'J'SERIES CARS & S/T TRUCK. Oldsmobile Firenza 1984

For 1990-2009 cars

# REAR MAIN SEAL REPLACEMENT 1984'J'SERIES CARS & S/T TRUCK

#### Models/Years 1982-84 Firenza with 1.8L (Vin Code G) & 2.0L (Vin Code P) Engines and 1980-84 Omega with 2.8L Engine

A one-piece rear main seal has been released for service on 1982 1.8L L4 engines (VIN Code 3). The service kit, part no. 14081761 previously approved for use in 1983 and early 1984 2.0L L-4 engines did not include servicing the 1982 1.8L L4 engine (refer to December, 1983 Service Guild, page 22), due to the knurls on the crankshaft rear seal surface, Testing, however, has shown this to be an acceptable service procedure for engines with crankshafts that are knurled.

A new 1.8L crankshaft, part no. 14086053, without knurls, has been released to service the 1.8L engine. This new crankshaft should also be used with the one-piece rear seal part no. 14081761.

Seat kit, part no. 14081761 has also been released to effectively correct rear main oil seal leaks on 1980 through 1984 2.8L engines. This supersedes the February, 1984 Service Guild, page 36 article on two-piece seal replacement in this engine.

To install seal kit, part no. 14081761, remove the engine per the appropriate service manual section and perform the following sequence of repair procedures;

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 by 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 1.0 mm bead) of anaerobic sealant, part no. 1052357 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 the 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 in the instructions, and discard.

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

10. Apply a 1.0 mm bead (approximately 1/32") of anaerobic sealant, part no. 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. Tighten bolts to a torque of 95 N.m (70 lbs.ft.).

11. Install remaining caps and main bearings. Tighten to a torque of 95 N.m (70 lbs. ft).

12. Install connecting rod bearings and caps. Tighten to torque specifications.

13. Complete engine assembly and installation per Oldsmobile Chassis 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.