Left Cylinder Head

Cylinder Head Replacement (Left Side)

Removal Procedure

1. Raise the vehicle.
2. Suitably support the vehicle.
3. Drain the coolant.
4. Remove the warm up three-way catalytic converter and the gasket from the exhaust manifold.
5. Lower the vehicle.
6. Remove the intake manifold.
7. Remove the secondary air injection hose from the check valve.
8. Remove the coolant air bleed pipe bolt from the left cylinder head using a backup wrench on the pipe fitting.
9. Remove the ignition coil bolts and the coil.
10. Remove the left exhaust manifold.
11. Remove the spark plug wire harness from the clips.
12. Remove the spark plug wire harness from the spark plugs.
13. Remove the spark plugs.
14. Remove the coolant temperature sensor electrical connector.
15. Remove the valve rocker arm cover bolts and the cover.
16. Remove the valve rocker arm nuts, rocker arms and pushrods.





17. Remove the cylinder head bolts.
18. Remove the cylinder head.
19. Remove the cylinder head gasket. Discard the cylinder head gasket.

Installation Procedure

Tools Required

J 36660-A Torque Angle Meter





1. Install the new cylinder head gasket. Ensure that the yellow tab is facing up.
2. Install the cylinder head over the locator pins and the cylinder head gasket.
3. Coat the threads of the cylinder head bolts with the sealing compound, GM P/N 12346004 or the equivalent.





4. Install the cylinder head bolts.

Tighten
Tighten the cylinder head bolts in sequence on the first pass to 30 Nm (22 lb ft).

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

5. Use the J 36660-A in order to tighten the cylinder head bolts on the second pass.

Tighten
^ Tighten the short bolts (3, 4, 7, 8, 11, 12, 15, 16) 55 degrees.
^ Tighten the medium bolts (14, 17) 65 degrees.
^ Tighten the long bolts (1, 2, 5, 6, 9, 10, 13) 75 degrees.

6. Install the valve rocker arms and the pushrods.
7. Install the left valve rocker arm cover and the bolts.

Tighten
Tighten the valve rocker arm cover bolts to 12 Nm (106 lb in).

8. Install the coolant temperature sensor electrical connector.
9. Install the spark plugs.

Tighten
^ Tighten the spark plugs to 30 Nm (22 lb ft) if a new cylinder head was installed.
^ Tighten the spark plugs to 20 Nm (15 lb ft) if a used cylinder head was installed.

10. Install the spark plug wire harness to the spark plugs.
11. Install the spark plug wire harness to the clips.
12. Install the left exhaust manifold.
13. Install the ignition coil bolts and the coil.

Tighten
Tighten the ignition coil studs to 40 Nm (30 lb ft).

14. Install the engine coolant air bleed pipe and the bolt to the left cylinder head using a backup wrench on the pipe fitting.

Tighten
Tighten the bolts to 40 Nm (30 lb ft).





15. Install the secondary air injection hose to the check valve.
16. Install the intake manifold.
17. Raise the vehicle.
18. Suitably support the vehicle.
19. Install the warm up three-way catalytic converter and the gasket to the exhaust manifold.
20. Lower the vehicle.
21. Refill with coolant. Bleed the system.