SERVICE MANUAL UPDATE SEC. 6A ENGINE MECHANICAL-OIL PAN

SUBJECT: SERVICE MANUAL UPDATE - SECTION 6A - ENGINE MECHANICAL (OIL PAN AND GASKET REPLACEMENT PROCEDURE)

MODELS AFFECTED: 1989-91 CENTURY MODELS WITH 2.5L ENGINE (VIN CODE R)

SERVICE MANUAL UPDATE - SECTION 6A

The following Oil Pan and Gasket Replacement procedure updates and replaces the current procedure found in the 1989 - '91 Century Service Manuals - Section 6A on the following pages, due to a new Labor Time Study.

Year Page

1989 6A1-13 1990 6A1-20 1993 6A1-27

OIL PAN AND GASKET FIGURES 1 AND 2

Tools Required:

J 23467-A

Remove or Disconnect

1. Negative battery cable 2. Air cleaner and duct assembly 3. Serpentine belt 4. Engine torque strut from engine bracket 5. Two upper front A/C compressor bolts to mounting bracket 6. Install J 28467-A 7. Raise vehicle and suitably support. Refer to General Information (Section OA). 8. Right front tire and wheel assembly. Refer to Tires and Wheels (Section 3E). 9. Right engine splash shield 10. Exhaust pipe and converter 11. Lower front A/C compressor mounting bolt and support brace. 12. Rear A/C compressor mounting bracket bolts 13. Wire harness from bracket at transaxle 14. Flywheel cover bolts 15. Starter and support bracket, set aside 16. Flywheel cover 17. Engine support bracket bolts to engine 18. Loosen transaxle mounting nuts 19. Lower vehicle 20. Raise front of engine about 3 inches using J 28467-A 21. Engine support bracket nuts to engine mount and frame assembly Remove support bracket and mount. Refer to Frame and Underbody (Section 10-3). 22. Raise vehicle and suitably support. Refer to General Information (Section OA). 23. Drain engine oil. 24. Using a jack stand, place a wood support along transaxle oil pan inside edge. Raise transaxle and engine assembly to normal sitting position using J 28467-A. 25. Oil pan retaining bolts 26. Oil pan from engine block

Clean Engine block and oil pan surfaces

Install or Connect 1. Apply RTV sealer GM P/N 12345739 or equivalent 2. Oil pan to engine block 3. Oil pan retaining bolts

Tighten Bolts to 10 N.m (89 lbs. in.)

4. Remove jack stand and wood support 5. Lower vehicle 6. Fill engine oil. Refer to Maintenance and Lubrication (Section OB). 7. Nuts holding engine support bracket to engine mount and mount assembly to frame assembly, bracket and mount. 8. Lower front of engine 9. Raise vehicle 10. Transaxle mounting nuts.

Tighten Nuts to 50 N.m (37 lbs. ft.).

11. Engine support bracket bolts to engine

Tighten Bolts to 50 N.m (37 lbs. ft.)

12. Flywheel cover 13. Starter assembly and support bracket. Refer to Cranking System (Section 6D2). 14. Flywheel cover bolts

Tighten Bolts to 10 N.m (89 lbs. in.)

15. Wire harness to bracket at transaxle 16. Rear A/C compressor mounting bracket bolts

Tighten Bolts 'to 30 N.m (22 lbs. ft.)

17. Lower front A/C compressor mounting bolts and support brace

Tighten Bolts to 25 N.m (18 lbs. ft.)

18. Exhaust pipe and converter 19. Right engine splash shield 20. Right front tire and wheel assembly. Refer to Tires and Wheels (Section 3E). 21. Lower vehicle 22. Remove J 24867-A 23. Upper front A/C compressor to mounting bracket bolts

Tighten Bolts to 25 N.m (18 lbs. ft.)

24. Engine torque strut to engine bracket Nuts to 56 N.m (41 lbs. ft.)

25. Serpentine belt 26. Air cleaner and duct assembly

Inspect Oil level Leaks

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.