REAR MAIN OIL SEAL REPLACEMENT - NEW P/N RELEASED

VEHICLES AFFECTED: 1983 and Early 1984 'J' Series Vehicles With 2.0L L4 Engines (Codes B, P)

A new one (1) piece rear crankshaft oil seal (P/N 14081761) has been released to replace the two (2) piece seal used in all 1983 2.0 litre L4 engines. The use of the two(2) piece seal should be discontinued for service and the new one (1) piece seal should be utilized for all future repairs of these engines.

Early production 1984 engines were assembled with the one (1) piece seal included. Therefore, if a rear oil seal in these models need replacement, the above-mentioned seal should be used.

BEFORE REPLACING A REAR MAIN OIL SEAL, CAR SHOULD BE TAKEN IN DETERMINING THE EXACT SOURCE OF LEAK.

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

REMOVAL

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

2. Remove oil pan and oil pump assembly.

3. Remove front cover. Lock chain tensioner with pin (Do Not Force).

4. Rotate crankshaft until timing marks on cam and crank sprockets line up.

5. Remove camshaft bolt, cam sprocket, and timing chain.

6. Rotate crankshaft to horizontal position.

7. Remove rod bearing nuts, caps, and bearings.

NOTICE: Care must be taken so that caps and/or bearings are not mixed.

8. Remove main bearing bolts, caps, and bearings.

9. Remove crankshaft.

10. Remove old oil seal and clean sealant from grooves (both cap and case).

11. Clean crankshaft seal area with solvent to remove excess sealant.

NOTICE: Care should be taken to avoid damage on surface.

12. Apply light coat of sealant P/N 993010 equivalent to O.D. of seal (approximately 1.0 mm bead).

13. Place seal tool assembly on rear area of crankshaft.

14. Position seal tool so that arrow points toward cylinder and case assembly (Figure 1).

15. Place crankshaft in engine with tool in place.

16. Remove tool and discard.

17. Put light coat of oil on crankshaft journals.

18. Seal rear main bearing split-line surface and replace cap and main bearing. (Use sealant P/N 993010 or equivalent).

19. Replace balance of caps and main bearings. Tighten to 85-100 N.m (63-75 ft. lb.) torque.

20. Replace rod bearings and caps. Tighten to 46-54 N.m (34-50) ft. lb.) torque.

21. Install oil pump making sure mating surface is free of foreign material. Tighten 35-47 N.m (26 ft. lb.) torque.

22. Align crank sprocket timing mark and install cam sprocket and timing chain. Tighten bolt to 90-115 N.m (66-85 ft.lb.) torque.

23. Clean, seal and install oil pan and front cover as previously outlined.

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.