Firenza L4-121 2.0L (1983)
Crankshaft Main Bearing Seal: Technical Service Bulletins
Engine - New Rear Main Oil Seal
SUBJECT
NEW REAR MAIN OIL SEAL
NUMBER: 84-T-5
DATE:
March 1, 1984
MODELS/YEARS
1982-84 FIRENZA WITH 1.8L (VIN CODE G) &
2.0L (VIN CODE P) ENGINES AND
SECTION:
6A
1980-84 OMEGA WITH 2.8L ENGINE
A one-piece rear main seal has been released for service on 1982 1.8L L-4 engines (VIN Code G). 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 L-4 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 engine 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 ft.lbs.).
11.
Install remaining caps and main bearings. Tighten to a torque of 95 N-m (70 ft.lbs.).
12.
Install connecting rod bearings and caps. Tighten to torque specifications.
13.
Complete engine assembly and installation per Oldsmobile Chassis Service Manual.
