Oil Pan/Gasket - Replacement Procedure Update
9224buick04
Bulletin:
91-6A-4
Date:
April, '91
Ref. No.:
91-168-6A
Corp. Ref. No.:
136112
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
1991 6A1-27
OIL PAN AND GASKET FIGURES 1 AND 2
Tools Required:
J 23467-A
Remove or Disconnect
1. Negative battery cable 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 0A).
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 0A).
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 0B).
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