Cylinder Head Replacement

Removal Procedure

Caution: Refer to Battery Disconnect Caution in Service Precautions.

1. Disconnect the negative battery cable.
2. Remove the intake manifold lower VIN K.
3. Remove the right exhaust manifold.
4. Remove the left valve rocker arm cover





5. Remove the electronic ignition module.
6. Disconnect the spark plug wires.
7. Remove the generator bracket and the generator.
8. Remove the A/C compressor bracket bolt.
9. Remove the power steering pump.
10. Remove the drive belt tensioner.
11. Remove the heat shield.
12. Remove the valve rocker arm assemblies and the push Rods.





13. Remove the cylinder head bolts. Discard the bolts.
14. Remove the cylinder head.





15. Remove the cylinder head gasket.
16. Clean all of the gasket mating surfaces.
17. Inspect the cylinder head.

Installation Procedure

^ Tools Required
- J 36660 Torque Angle Meter
- 7/16-14 tap

Notice: This engine uses special torque to yield head bolts. This design bolt requires a special tightening procedure. Failure to follow the given procedure will cause head gasket failure and possible engine damage.





1. Clean the threads in the block. Use a 7/16-14 tap.

Notice: Installing the head gasket with the arrow pointing to the front will cause gasket failure and possible engine failure. Head gaskets are not interchangeable.

2. Install the head gasket with the arrow pointing to the front of the engine.





3. Install the cylinder head.

Notice: This bolt is designed to permanently stretch when tightened. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged. Refer to Fastener Notice in Service Precautions.





4. Install the new cylinder head bolts.
^ Tighten the cylinder head bolts in sequence to 50 Nm (37 ft. lbs.).

^ Rotate each bolt 120 degrees in sequence. Use the J 36660.
5. Install the valve rocker arm assemblies and the pushrods.

Notice: This bolt is designed to permanently stretch when tightened. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.

6. Apply GM P/N 12345493 approved thread lock compound or equivalent to the valve rocker arm pedestal bolts before assembly.
7. Install the lower intake manifold VIN.
8. Install the left valve rocker arm cover.
9. Install the left exhaust manifold.





10. Install the A/C compressor bracket bolt.
^ Tighten the bolt to 70 Nm (52 ft. lbs.).

11. Install the generator support bracket to the cylinder head. Install the generator.
12. Install the electronic ignition module.
13. Connect the spark plug wires.
14. Install the drive belt tensioner.
15. Install the power steering pump.
16. Install the heat shield.
17. install the fuel injector sight shield. Refer to Intake Manifold.
18. Connect the negative battery cable.