Flywheel - Replacement Procedure Revision
9224buick04
Bulletin:
91-6A-8
Date:
May '91
Ref. No.:
91-174-6A
Corp. Ref. No.:
136110
SUBJECT:
SERVICE MANUAL UPDATE - SECTION 6A - ENGINE MECHANICAL
FLYWHEEL REPLACEMENT (REVISED PROCEDURE)
MODELS AFFECTED:
1989-91 CENTURY WITH 3300 V6 AND 4T60 TRANSAXLE
SERVICE MANUAL UPDATE - SECTION 6A
The following Flywheel Replacement procedure updates and replaces the current procedure found in the 1989 through 1991 Century Service Manual - Section 6A.
FLYWHEEL REPLACEMENT
Figures 1 through 7
Tools Required:
J 28467-A Engine Support FIXTURE
J 34754 Drive Axle Seal Protector
J 37292-B Axle Seal Protector
J 36660 Torque/Angle Meter (1991 Model)
Remove or Disconnect
1. Negative battery cable
2. Air cleaner and duct assembly
3. T.C.C. switch electrical connector
4. A/C low pressure switch electrical connector
5. Neutral start switch electrical connector
6. T.V. cable from throttle body and transaxle
7. Shift control cable from transaxle mounting bracket and lever
8. Vacuum modulator line from modulator
9. Three upper transaxle bolts from engine and ground wires
10. Steering shaft pinch bolt. Refer to Power Steering Gear and Pump (Section 3B1).
11. Install J 28467-A
12. Raise vehicle and suitably support. Refer to General Information (Section 0A).
13. Front tire and wheel assemblies. Refer to Tires and Wheels (Section 3E).
14. Engine splash shields
15. Pinch bolts from control arms. Refer to Front Suspension (Section 3C).
16. Stabilizer shaft bolts and reinforcement plates from frame
17. Stabilizer shaft nuts and bracket from control arm. Separate stabilizer shaft from control arm.
18. Using a 7/16 inch drill bit, drill through two spot welds located between front and rear holes of left front stabilizer shaft mounting.
19. Front and rear transaxle mounting nuts
20. Power steering cooler line bolts
21. Right frame to left frame retaining bolt. Position jack stand under frame for support. Refer to Frame and Underbody (Section 10-3)
22. Loosen two right frame mounts and discard bolts.
23. Two left frame bolts from frame
24. Left frame assembly
25. Transaxle mount retaining bolts from transaxle case. Remove mount.
26. Two flywheel inspection covers
27. Torque converter bolts
NOTICE:
DRIVE AXLE SEAL PROTECTOR J 34754 SHOULD BE MODIFIED AND INSTALLED ON ANY DRIVE AXLE PRIOR TO SERVICE PROCEDURES ON OR NEAR THE DRIVE AXLE. FAILURE TO OBSERVE THIS MAY RESULT IN SEAL DAMAGE AND POSSIBLE JOINT FAILURE. REFER TO DRIVE AXLE (SECTION 4D) FOR INFORMATION ON J 34754 AND FOR PROPER DRIVE AXLE REMOVAL AND HANDLING PROCEDURES.
28. Drive axles from transaxle. Refer to Drive Axle (Section 4D).
29. Transaxle support bracket bolts from transaxle
30. Vehicle speed sensor electrical connector from transaxle
31. Transaxle cooler lines
32. Install transaxle jack
33. Rear transaxle bolts from engine
34. Remaining transaxle bolts
35. Transaxle
36. Flywheel attaching bolts and flywheel. Discard bolts.
Inspect Flywheel, if cracked, badly worn or broken teeth, replace. Crankshaft and flywheel mating surfaces for burrs. Remove as required.
Install or Connect
1. Flywheel and new attaching bolts. Apply thread lock compound GM P/N 12345493 or equivalent to bolt threads before assembly.
Tighten
(1989-90 Models)
Bolts to 82 N-m (61 lbs.ft.)
(1991 Models)
Bolts to 15 N-m + 50~ (11 lbs.ft.+ 50~) Use J 36660 Torque/Angle Meter.
2. Dial indicator on engine block and check flywheel runout at three attaching bosses.
IMPORTANT
The crankshaft end-play must be held in one direction during this check. Run-out should not exceed 0.381 mm (0.015 in.).
3. If run out exceeds 0.381 mm (0.015 in.) attempt to correct by tapping high side with mallet.
4. If condition cannot be corrected, replace flywheel.
5. Transaxle
6. Remaining transaxle bolt
Tighten Bolts to 75 N-m (55 lbs.ft.).
7. Remove transaxle jack
8. Transaxle cooler lines
9. Rear transaxle to engine bolt.
Tighten Bolts to 55 N-m (41 lbs.ft.)
10. V.S.S. electrical connector to transaxle
11. Transaxle support bracket and bolts to transaxle
Tighten Bolts to 43 N-m (32 lbs.ft.)
12. Drive axles to transaxle. Refer to Drive Axle (Section 4D).
13. Converter to flywheel bolts
Tighten All bolts to 62 N-m (46 lbs.ft.). Retorque the first bolt after all three have been tightened.
14. Two flywheel inspection covers
Tighten Bolts to 10 N-m (89 lbs.in.)
15. Transaxle mount and transaxle mounting bolts to transaxle case
Tighten Bolts to 55 N-m (41 lbs.ft.)
16. Left frame assembly
17. Left frame assembly bolts to body
Tighten Bolts to 54 N-m (40 lbs.ft.)
18. Right frame bolts to body
Tighten Bolts to 54 N-m (40 lbs.ft.)
19. Remove jack stand
20. Right frame to left frame retaining bolts. Refer to Frame and Underbody (Section 10-3).
21. Power steering cooler lines
22. Transaxle mounting nuts
Tighten Nuts to 50 N-m (37 lbs.ft.)
23. Left stabilizer shaft to control arm nuts
24. Stabilizer shaft bolts and reinforcement plates to frame using a jack stand for support.
25. Pinch bolt to control arms. Refer to Front Suspension (Section 3C).
26. Engine splash shields
27. Front tire and wheel assemblies. Refer to Tires and Wheels (Section 3E).
28. Lower vehicle and remove J 24867-A.
29. Steering shaft pinch bolt. Refer to Power Steering Gear and Pumps (Section 3B1).
30. Three upper transaxle bolts and ground wires to engine
Tighten Bolts to 75 N-m (55 lbs.ft.)
31. Vacuum modulator line to modulator
32. Transaxle shift cable, mounting bracket and lever
33. T.V. cable to throttle body and transaxle
34. T.C.C. switch electrical connector
35. A/C low pressure switch electrical connector
36. Neutral start switch electrical connector
37. Air cleaner and duct assembly
38. Negative battery cable
Adjust
T.V. cable. Refer to "T.V. Cable Setting" in the Service Manual Toe-in, if required. Refer to Wheel Alignment (Section 3A). Transaxle fluid.
Inspect
Proper fluid levels.
Fluid leaks.