34. Cylinder Head Assemble

Cylinder Head Assemble

Special Tools

J 8062 - Valve Spring Compressor - Head Off

For equivalent regional tools, refer to Special Tools (Special Tools)




1. Clean the cylinder head valve spring shim area.

Note: When using the valves and related components again, install the parts to their original location.

2. Install the valves (228) into the proper port. Refer to Separating Parts (Separating Parts)
3. Install a NEW valve stem oil seal (222).
4. Install the valve spring (223).
5. Install the valve spring cap (224).




6. Using the J 8062 - spring compressor , compress the valve spring.
7. Install the valve stem keys.

1. Use grease in order to hold the keys in place and remove the J 8062 - spring compressor.
2. Ensure the keys seat properly in the groove of the valve stem.
3. Tap the end of the valve stem with a plastic face hammer to seat the keys, if necessary.




8. After installation, measure the valve spring installed height.
Measure from the base of the valve spring to the top of the valve spring. If the spring installed height is not within specification, the valve and/or cylinder head must be replaced. Refer to Engine Mechanical Specifications (RPO L20 VIN A) (Service Limits & General Specifications)Engine Mechanical Specifications (RPO L96 VIN G) (6.0L RPO L96 VIN G)Engine Mechanical Specifications (RPO L9H) (Service Limits & General Specifications)Engine Mechanical Specifications (RPO LC9 VIN 3) ()Engine Mechanical Specifications (RPO LMG VIN 0) ()Engine Mechanical Specifications (RPO LY6 VIN K) (6.0L RPO LY6 VIN K)
9. Install the remaining valves, springs, and other components.




10. Install sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the coolant temperature sensor (725).

Caution: Refer to Fastener Caution (Fastener Caution)

11. Install the coolant temperature sensor into the left cylinder head and tighten to 20 Nm (15 lb ft).




12. Install sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the cylinder head plug (229).
13. Install the cylinder head plug to the right cylinder head and tighten to 20 Nm (15 lb ft).




14. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the sides of the cylinder head plugs (216).
15. Install the cylinder head plugs into the cylinder head.
A properly installed plug should be installed 2.5 mm (0.1 in) below the end face of the head.




16. Install the rivet plug (1) into a rivet gun.




17. Insert the rivet into the coolant passage of the cylinder head.
18. Squeezing the handle of the tool, install the rivet.




19. Inspect for proper installation of the rivet (1).
A properly installed plug should be installed flush with the surface of the head.




20. Installation of the first design coolant air bleed cover (313) and bolt (312) may be used instead of the rivet plug to complete the repair. Tighten the coolant air bleed bolts to 12 Nm (106 lb in).