NEW ONE-PIECE REAR MAIN CRANKSHAFT SEAL
Model and Year 1983-84 2.0L CAVALIER AND "S/T" TRUCK
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 2.0L L4 (not 1982 1.8L L4's) 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.
Care should be taken in diagnosis of oil leaks. In many cases, oil pan, cam cover or rocker arm cover leaks are misdiagnosed as rear main seal leaks.
All 2.0L engines have ultraviolet (UV) dye added to the engine oil to facilitate oil leak diagnosis. This dye mixes with the engine oil and causes it to take on a yellowish glow under a blacklight.
Kit, P/N 14081761, includes: tool, seal and instructions.
Use of shop manual is advised.
The following sequence of repair and installation should be followed.
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 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 tool in place, set crankshaft in engine. Aligning 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 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 installation per Chevrolet Service Manual.
Labor Operation Number: J1120
Labor Time "J" "S" "T" ---- ---- --- 6.2 6.7 9.2 With A/C .8 .3 .3 With P/S .2 .3 .3 With Cruise Control .2 W/Auto Transmission .4 W/Skid Plate .2
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.
