Cylinder Head Assembly: Service and Repair

Fig. 2 Cylinder head installation:

REMOVE OR DISCONNECT
1. Intake manifold. Refer to Intake Manifold / Service and Repair. Service and Repair
2. Coolant from the engine block.
3. Raise the vehicle. Support with suitable safety stands.
4. Exhaust pipe from the manifold.
5. Lower the vehicle.
6. Dipstick tube (left side only).
7. Ground Strap at rear of head and sensor connector at front of head (left side only).
8. Drive belt generator. and AIR pump with mounting bracket (right side only).
9. Pushrods. Refer to Push Rod / Service and Repair. Service and Repair
10. Head bolts.
11. Cylinder head.
12. Head gasket.

CLEAN
^ Carbon deposits tram combustion chambers.
^ All traces of old head gasket from the cylinder head and block.
^ Cylinder head bolt threads and threads in the block.

INSPECT
^ Sealing surfaces of the block and cylinder head for nicks, heavy scratches, or other damage.

INSTALL OR CONNECT
1. Gasket in place over the dowel pins with the note "This Side Up" showing.
2. Cylinder head.
^ Gasket must be fully seated on the block before head installation.
3. Head bolts.
^ Coat the bolt threads with sealing compound (GM part no. 1052080 or equivalent).
^ Install all bolts finger tight.
Tighten
^ All bolts to 55 Nm (40 ft. lbs.), using the sequence shown.
^ In sequence, tighten all bolts an additional 90 degrees (1/4-turn).
4. Pushrods.
Adjust
^ Valves. Refer to Valve, Intake/Exhaust / Service and Repair. Adjustments
5. Generator and AIR pump with mounting bracket and drive belt (right side only).
6. Ground strap and sensor connector (left side only).
7. Dipstick tube (left side only).
8. Raise the vehicle.
9. Exhaust pipe.
10 Lower the vehicle.
11. Intake manifold.
12. Proper quantity and grade of coolant.