Cylinder Head Assemble

Special Tools

• J-8062  Valve Spring Compressor
• J-9666  Valve Spring Tester
• EN-50031  Valve Spring Compressor (off-vehicle)
• EN-50723  Valve Seal Installer

Equivalent regional tools:Special Tools 

1. Courtesy of GENERAL MOTORS COMPANY

   Install NEW cylinder head plugs. Coat the plugs with sealer GM P/N 12345382 (Canadian P/N 10953489) or equivalent.

2. Tighten plugs to 60 N.m (44 lb ft)

3. Courtesy of GENERAL MOTORS COMPANY

   Assemble the valves.

4. 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 check. The traces of Prussian blue transferred to the valve face indicates valve face concentricity.

5. Courtesy of GENERAL MOTORS COMPANY

   Replace the valves, if required.

6. Courtesy of GENERAL MOTORS COMPANY

   Install the NEW valve seals using the EN-50723  installer. Fully seat the seals on the valve guides.

7. Install the spring (1).

8. Courtesy of GENERAL MOTORS COMPANY

   Install the retainer.

9. Using the J-8062  compressor and the EN-50031  compressor, compress the valve spring.
10. Install the valve keys.
11. Slowly release the J-8062  compressor and the EN-50031  compressor from the valve/spring assembly.
12. Inspect for proper valve key seating.
13. Install the remaining valves, springs, and other components.