Special Tools

J 36660-A Electronic Torque Angle Meter

1. Drain the engine coolant. Refer to Cooling System Draining and Filling .
2. Remove the generator mounting bracket. Refer to Generator Bracket Replacement .



3. Remove the generator mounting bracket stud from the cylinder head.
4. Remove the lower intake manifold. Refer to Lower Intake Manifold Replacement .
5. Remove the exhaust manifold. Refer to Exhaust Manifold Replacement - Right Side .
6. Remove the valve pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .



7. Remove the spark plugs.



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



9. Remove and discard the cylinder head bolts.



10. Remove the cylinder head.



11. Remove and discard the cylinder head gasket.



12. Remove the dowel pins (cylinder head locator) (if required).
13. Clean the engine block and the cylinder head sealing surfaces.

Notice: Clean all dirt, debris, and coolant from the engine block cylinder head bolt holes. Failure to remove all foreign material may result in damaged threads, improperly tightened fasteners or damage to components.

14. Clean the engine block bolt holes.
15. For further service to the cylinder head refer to the following:

•	Cylinder Head Disassemble in Engine Unit Repair Manual.

•	Cylinder Head Cleaning and Inspection in Engine Unit Repair Manual.

•	Valve Guide Reaming, and Valve and Seat Grinding in Engine Unit Repair Manual.

•	Cylinder Head Assemble in Engine Unit Repair Manual.

1. Clean the cylinder head gasket surfaces on the engine block.
2. Inspect the dowel pins (cylinder head locator) for proper installation.
3. Clean the cylinder head gasket surfaces on the cylinder head.




Important: Do not use any type sealer on the cylinder head gasket (unless specified).

4. Install the NEW cylinder head gasket in position over the dowel pins (cylinder head locator).



5. Install the cylinder head onto the engine block.

Guide the cylinder head carefully into place over the dowel pins and the cylinder head gasket.




6. Apply sealant GM P/N 12346004 or equivalent to the threads of the NEW cylinder head bolts.
7. Install the cylinder head bolts finger tight.

Notice: Refer to Fastener Notice in the Preface section.




8. Tighten the cylinder head bolts in sequence on the first pass.

Tighten
Tighten the bolts in sequence on the first pass to 30 N·m (22 lb ft).

9. Use the in order to tighten the cylinder head bolts in sequence on the final pass.

Tighten

•	Tighten the long bolts (1, 4, 5, 8, 9) on the final pass in sequence to 75 degrees.

•	Tighten the medium bolts (12, 13) on the final pass in sequence to 65 degrees.

•	Tighten the short bolts (2, 3, 6, 7, 10, 11) on the final pass in sequence to 55 degrees.




10. Install the spark plug wire support and bolts.

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




11. Measure the NEW spark plugs for the proper gap.

Adjust the spark plug gap if necessary.

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

12. Install the spark plugs.

Tighten

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

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

13. Install the valve pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
14. Install the lower intake manifold. Refer to Lower Intake Manifold Replacement .
15. Install the exhaust manifold. Refer to Exhaust Manifold Replacement - Right Side .



16. Install the stud for the generator mounting bracket.

Tighten
Tighten the generator mounting bracket stud to 20 N·m (15 lb ft).

17. Install the generator mounting bracket. Refer to Generator Bracket Replacement .
18. Fill the engine coolant system. Refer to Cooling System Draining and Filling .