Cylinder Head Assemble

Tools Required

• J 8062:  Valve Spring Compressor. See Special Tools and Equipment .
• J 9666:  Valve Spring Tester. See Special Tools and Equipment .
• J 43963:  Valve Spring Compressor (off car). See Special Tools and Equipment .

1. Install NEW cylinder head plugs. Coat the plugs with sealer GM P/N 12345382 (Canadian P/N 10953489) or equivalent.
   Fig 1: View Of Cylinder Head Plugs

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2. Inspect the valve springs. Refer to Engine Mechanical Specifications  for the tolerances.
   Fig 2: Inspecting Valve Spring For Squareness

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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
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 check. The traces of Prussian blue transferred to the valve face indicates valve face concentricity.
   Fig 3: Checking Valve Concentricity

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

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

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8. Install the spring.
   Fig 6: View Of Valve Springs

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9. Install the retainer.
   Fig 7: Identifying Valve Spring Retainers

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10. Using the J 8062  and the J 43963  , compress the valve spring.
11. Install the valve keys.
12. Slowly release the J 8062  and the J 43963  from the valve/spring assembly.
13. Inspect for proper valve key seating.
14. Measure the valve installed height using a ruler. Measure from the base of the valve spring to the top of the valve. Refer to Engine Mechanical Specifications  for the correct specification.
    Fig 8: Measuring Valve Spring Installed Height

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15. Install the remaining valves, springs, and other components.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
16. Install the cylinder head air bleed tube.

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

    Fig 9: Identifying Cylinder Head Air Bleed Tube

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