Cylinder Head Assemble

Tools Required 

• J 8062  Valve Spring Compressor
• J 43184  Valve Spring Compressor Adaptor

1. Use a steel square and measure the deviation of the valve spring.

   Valve Spring Deviation 

   1.6 mm (0.063 in)

2. If the deviation of any valve spring is greater than the specified maximum, the valve spring must be replaced.
   Fig 1: Measuring Deviation Of Valve Spring

   Courtesy of GENERAL MOTORS CORP.
3. Use a Vernier caliper and measure the free length of the valve spring.

   Intake Valve Spring Free Length 

   46.4 mm (1.830 in)

   Exhaust Valve Spring Free Length 

   46.5 mm (1.831 in)

4. If the free length of any valve spring is not within specifications, the valve spring must be replaced.
   Fig 2: Measuring Free Length Of Valve Spring

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5. Use a spring tester and measure the tension of the valve spring at the specified installed height.

   Intake Valve Spring Tension 

   22.5-24.7 kgf (49.6-55.5 lbf) at 38.5 mm (1.516 in)

   Exhaust Valve Spring Tension 

   21.2-23.4 kgf (47.6-52.6 lbf) at 38.5 mm (1.516 in)

6. If the installed tension of any valve spring is not within specifications, the valve spring must be replaced.
   Fig 3: Measuring Tension Of Valve Spring

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7. Inspect the valve spring seating surface of the valve spring seats for wear or gouging. Replace as required.
8. Temporarily install the valves (1) into the cylinder head.
9. Use the following steps to measure valve runout:
   1. 9.1. 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. 9.2. Clean all traces of Prussian blue.
   3. 9.3. 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.
   4. 9.4. Recondition the valve seat or replace the valves, if required.
   Fig 4: Measuring Valve Runout

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   Important:  Pay close attention when installing the valve seals. The intake valve seals are light brown in color and the exhaust valve seals are gray in color.

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

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11. Install the spring seat (2).
12. Install the spring (3).
13. Install the retainer (4).
    Fig 6: Installing Valve Components

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    NOTE: Refer to FASTENER NOTICE .
14. Compress the valve spring. Use the J 8062  and the J 43184  .
    Fig 7: Compressing Valve Spring

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15. Install the valve keepers.
16. Slowly release the J 8062  (3) from the valve/spring assembly.
    Fig 8: Installing Valve Keepers

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17. Use a plastic faced hammer and lightly tap the valve stem tip and inspect for proper valve keeper seating.
    Fig 9: Inspecting For Proper Valve Keeper Seating

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