42. Cylinder Head Assemble

Cylinder Head Assemble

Special Tools
* J 8062 - Valve Spring Compressor - Head Off
* J 9666 - Valve Spring Tester
* J 43963 - Valve Spring Compressor (Off Car)

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





Caution: In order to avoid damage, install the spark plugs after the cylinder head has been installed on the engine.

1. Install NEW cylinder head plugs. Coat the plugs with sealer GM P/N 12345382 (Canadian P/N 10953489) or equivalent.
2. Inspect the valve springs.
3. Look for the following conditions when inspecting the valve springs:

* Expanded height
* Unparalleled spring ends
* Spring tension using J 9666 - tester
* Any distorted springs should be replaced




4. Assemble the valves.
5. Use the following steps to measure valve runout:

1. Apply a dab of Prussian blue on the entire valve face. Seat the valve but do not rotate it. The Prussian blue traces transferred to the valve seat are an indication of concentricity of the valve seat.
2. Clean all traces of Prussian blue.
3. Apply a dab of Prussian blue on the valve seat and repeat the inspection. The traces of Prussian blue transferred to the valve face indicates valve face concentricity.




6. Replace the valves, if required.




7. Install the new valve seals. Fully seat the seals on the valve guides.




8. Install the springs.




9. Install the retainer.
10. Using the J 8062 - compressor and the J 43963 - compressor , compress the valve spring.
11. Install the valve keys.
12. Slowly release the J 8062 - compressor and the J 43963 - compressor from the valve/spring assembly.
13. Inspect for proper valve key seating.
14. Install the remaining valves, springs, and other components.




15. Lubricate the camshaft position sensor O-ring with clean engine oil.

Caution: Refer to Fastener Caution (Fastener Caution).

16. Install the intake camshaft position sensor and bolt. Tighten the intake camshaft position sensor bolt to 10 Nm (89 lb in).