Cylinder Head Assemble

Tools Required 

• J 8062  Valve Spring Compressor
• J 9666  Valve Spring Tester
• J 43963  Valve Spring Compressor Adapter

1. Install NEW cylinder head plugs. Coat the plugs with Sealer GM P/N United States 12345382, GM P/N Canada 10953489, or equivalent.
   Fig 1: Cylinder Head Plugs

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2. Inspect the valve springs. Refer to Engine Mechanical Specifications .
3. Look for the following conditions when inspecting the valve springs:
   • Expanded height
   • Unparallel spring ends
   • Spring tension using J 9666 
   • Any distorted springs should be replaced
   Fig 2: Inspecting Valve Springs

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4. Assemble the valves.
5. Use the following steps to measure valve runout:
   1. 5.1. 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. 5.2. Clean all traces of Prussian blue.
   3. 5.3. 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.
   Fig 3: Checking Valve Seat

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6. Replace the valves, if required.
   Fig 4: Installing Valves

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7. Install the new valve seals. Fully seat the seals on the valve guides.
   Fig 5: Valve Seals

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8. Install the spring.
   Fig 6: Valve Spring

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9. Install the retainer.
10. Using the J 8062  and the J 43963,  compress the valve spring.
11. Install the valve keys.
Fig 7: Valve Keys
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12. Slowly release the J 8062  and the J 43963  from the valve/spring assembly.
13. Inspect for proper valve key seating.
14. Install the cylinder head air bleed tube.

    Tighten 

    Tighten the bolts to 15 N.m (133 lb in).