Special Tools

J 36660-A Torque Angle Meter

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Remove the drive belt. Refer to Drive Belt Replacement .
3. Remove the lower intake manifold. Refer to Lower Intake Manifold Replacement .
4. Remove the left exhaust manifold. Refer to Exhaust Manifold Replacement - Left Side .
5. Remove the left side pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
6. Remove the junction block bracket bolt.
7. Position the bracket and wiring harness aside.



8. Position the power steering (P/S) pump bracket off of the stud and set aside.



9. Remove the P/S pump bracket stud.



10. Remove the harness ground bolt.
11. Position the harness ground (4) and ground strap (5).



12. Remove the engine coolant temperature (ECT) sensor.



13. Remove the spark plugs.



14. Remove the spark plug wire support bolts and support.



15. Remove and discard the cylinder head bolts.



16. Remove the cylinder head.



17. Remove and discard the cylinder head gasket.



18. Remove the cylinder head locator pins, if necessary.
19. Clean and inspect the cylinder head, if necessary. Refer to Cylinder Head Cleaning and Inspection for the 4.3L engine - Unit Repair.
20. Disassemble the cylinder head, if necessary. Refer to Cylinder Head Disassemble for the 4.3L engine - Unit Repair.

1. Assemble the cylinder head, if necessary. Refer to Cylinder Head Assemble for the 4.3L engine - Unit Repair.
2. Install the cylinder head locator pins, if necessary.




Important: Do not use any type of sealer on the cylinder head gasket.

3. Install a NEW cylinder head gasket.



4. Install the cylinder head.



5. Apply sealant GM U.S. P/N 12346004 (Canadian P/N 109534480), or equivalent to the threads of the NEW cylinder head bolts.
6. Install the cylinder head bolts finger tight.

Notice: Refer to Fastener Notice in the Preface section.




7. Tighten the cylinder head bolts using the sequence shown.

Tighten

1. Tighten the cylinder head bolts a first pass to 30 N·m (22 lb ft).
2. Tighten the long cylinder head bolts (1, 4, 5, 8, 9) a final pass to 75 degrees using J 36660-A .
3. Tighten the medium cylinder head bolts (12, 13) a final pass to 65 degrees using J 36660-A .
4. Tighten the short cylinder head bolts (2, 3, 6, 7, 10, 11) a final pass to 55 degrees using J 36660-A .



8. Install the spark plug wire support and bolts.

Tighten
Tighten the spark plug wire support bolts to 12 N·m (106 lb in).




9. Install the spark plugs.
10. If installing NEW spark plugs measure for the correct gap. Adjust the spark plug gap if necessary.

Specification
Spark plug gap to 1.52 mm (0.060 in).

Tighten

•	Tighten the spark plugs for a USED cylinder head to 15 N·m (11 lb ft).

•	Tighten the spark plugs on the initial installation of a NEW cylinder head to 30 N·m (22 lb ft).




11. Install the ECT sensor. If reusing the old sensor, apply sealant GM P/N 12346004 (Canadian P/N 109534480), or equivalent to the threads.

Tighten
Tighten the ECT sensor to 20 N·m (15 lb ft).




12. Position the ground strap (5) and harness ground (4).
13. Install the harness ground bolt.

Tighten
Tighten the harness ground bolt to 16 N·m (12 lb ft).




14. Install the P/S pump bracket stud.

Tighten
Tighten the P/S pump bracket stud to 20 N·m (15 lb ft).




15. Position the P/S pump bracket onto the stud.



16. Position the bracket and wiring harness.
17. Install the junction block bracket bolt.

Tighten
Tighten the junction block bracket bolt to 25 N·m (18 lb ft).

18. Install the left side pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
19. Install the left exhaust manifold. Refer to Exhaust Manifold Replacement - Left Side .
20. Install the lower intake manifold. Refer to Lower Intake Manifold Replacement .
21. Install the drive belt. Refer to Drive Belt Replacement .
22. Fill the cooling system. Refer to Cooling System Draining and Filling .