Engine - Updated Camshaft Gear Replacement
89buick08Bulletin 89-6-11
Date May, '89
Ref. No. 89-134-6
Corp. Ref. No. 936111
SUBJECT: SERVICE MANUAL UPDATE - CAMSHAFT GEAR REPLACEMENT, SECTION 6A3
MODELS AFFECTED: 1989 SKYLARKS WITH 2.5L (VIN CODE U)
SERVICE MANUAL UPDATE
A revised service procedure has been developed for replacement of camshaft timing gears. The revised method does not require the complete removal of the engine from the vehicle. Cam gear replacement is generally accomplished by partially lowering the engine/frame assembly to gain access to the cam gear.
IMPORTANT: SEE APPROPRIATE SERVICE MANUAL SECTION FOR FASTENER TORQUE SPECIFICATIONS.
Tools Required:
J28467-A Engine Support Fixture (with long hooks)
J24420-B Cam Gear Removal Tool
J25033-B Cam Gear Installation Tool
J34995 Crankshaft Front Cover Oil Seal Installer
J8001 Universal Dial Indicator w/Magnetic Base
Remove or Disconnect
1. Negative battery cable.
2. Accessory drive belts.
3. Power steering pump mount bolts - lay pump aside.
4. Body ground strap.
5. Front end sheet metal diagonal brace (R.H.).
6. Install engine support fixture - J28467-A per Service Manual.
7. Upper front engine mount to body bolts (2).
8. Raise vehicle.
9. Right front wheel.
IMPORTANT: USE CARE TO AVOID DRILL WANDER THAT COULD DAMAGE CAMSHAFT.
29. Enlarge pilot holes with 5.5mm drill; 1/4 inch deep.
30. Tap 5.5mm holes with 1/4-28-NF bottoming tap.
31. Drill a hole no larger than 1mm (.040 in.) in the front oil gallery plug. This provides improved lubrication to the timing gears.
Clean
- Oil pan of debris.
32. Cam gear with J24420-B - do not move cam or crank.
Inspect
- Thrust plate for scuffing and/or grooving. If evident, install new thrust plate, spacer ring, and key. Thrust plate-to-block bolts torque
- 10 N. (90 lb in).
IMPORTANT: LUBRICATE FRONT THRUST PLATE SURFACE WITH CLEAN ENGINE OIL
Install or Connect
1. Cam gear using J25033-B - align timing marks.
Measure
- Camshaft end play using dial indicator - J8001 or equivalent. Push cam gear onto camshaft until camshaft until camshaft end play is in the range of .0015 in. to .0050 in. (.04mm to .13mm).
2. Front cover seal using J34995 - lubricate seal lip with clean engine oil.
3. Apply RTV sealant to timing gear cover sealing surfaces.
4. Front cover to engine.
5. Lower vehicle.
6. Raise engine assembly with support fixture.
7. Thru bolt in rear transaxle mount.
8. Retaining bolts (2) in front engine mount.
9. Raise vehicle.
10. Retaining nuts (2) and thru bolts (2) in right front engine mount.
11. Retaining bolt (1) in left front engine mount.
12. Place axle stand under right front suspension support, raise into position and fasten with retaining bolts (6).
13. Place axle stand under left front suspension support, raise into position and fasten with retaining bolts.
14. Crankshaft pulley and bolt (with assistant).
15. Flywheel/flexplate cover and bolts.
16. Engine splash shield.
17. Brakeline-to-body bracket.
18. Right front wheel.
19. Lower vehicle.
20. Transaxle bracket to transaxle mount long bolt.
21. Remove engine support fixture.
22. Engine oil (replace oil filter).
23. Power steering pump mount bolts to engine.
24. Accessory drive belts.
25. Front end sheet metal diagonal brace (R.H.)
26. Body ground strap.
27. Negative battery cable.
28. Check front end toe-in and adjust if necessary.
Inspect
- For oil and coolant leaks with engine running at operating temperature.
- For proper completion of repairs.