Timing Gear Replacement

Remove or Disconnect
1. Negative battery cable.
2. Power steering reservoir from the radiator shroud.
3. Upper fan shroud.
4. Drive belt.
5. Fan and pulley.
6. Crankshaft pulley.
7. Timing gear cover.
8. Distributor.
9. Oil pump drive shaft.
10. Pushrod cover.
11. Rocker arm cover.
12. Hydraulic lifters and pushrods.
13. Radiator.
14. Air conditioning condenser.
15. Grille and filler panel.





16. Thrust plate bolts (103)
17. Camshaft. Support the camshaft carefully to avoid damage to the camshaft bearings.
Inspect
^ Camshaft lobes and journals for scratches, pitting, and wear.
^ Timing gear for damaged teeth.

Measure





^ Thrust plate to camshaft clearance. Use a feeler gage. The proper clearance is 0.0015-0.0050 inch. If the clearance is excessive, replace the thrust plate. It the clearance is insufficient, replace the spacer ring.


Install or Connect

^ Coat the camshaft lobes and journals with High Viscosity Oil with Zinc (GM P/N 12345501 or equivalent).

1. Camshaft (108) to the engine. Handle the camshaft carefully to prevent damage to the camshaft bearings.
Important
^ Line up the timing marks on the crankshaft gear and camshaft gear.

NOTICE: See "Notice" on page 6A1-1.

2. Thrust plate bolts (103).
Tighten
Thrust plate bolts to 10 N.m (90 in. lbs.).
3. Grille and filler panel.
4. Air conditioning condenser.
5. Radiator.
6. Hydraulic lifters and pushrods.
7. Rocker arm cover.
8. Pushrod cover.
9. Oil pump drive shaft.
10. Distributor.
11. Timing gear cover.
12. Fan and pulley.
13. Drive belt.
14. Upper fan shroud.
15. Power steering reservoir to the fan shroud.
16. Negative battery cable.
^ Fill the cooling system with the proper quantity and grade of coolant.