GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 8062 Valve Spring Compressor Head-Off
    • EN 46116 Valve Stem Seal Remover/Installer
    • EN 46117 Valve Stem Key Remover/Installer
    • EN 46119 Off-Vehicle Valve Spring Compressor Adapter

    Object Number: 1799044  Size: SH

    Important: Ensure valve heads will not contact anything during the following step in order to avoid bending or damage.

  1. Remove the cylinder head assembly. Refer to Cylinder Head Disassemble.
  2. Using an appropriately sized deep socket (1) and a plastic hammer (2), lightly tap on the valve spring retainer to loosen the valve collets.

  3. Object Number: 1799046  Size: SH

    Caution: Compressed valve springs have high tension against the valve spring compressor. Valve springs that are not properly compressed by or released from the valve spring compressor can be ejected from the valve spring compressor with intense force. Use care when compressing or releasing the valve spring with the valve spring compressor and when removing or installing the valve stem keys. Failing to use care may cause personal injury.

    Notice: Do not compress the valve springs to less than 24.0 mm (0.943 in). Contact between the valve spring retainer and the valve stem oil seal can cause potential valve stem oil seal damage.

  4. Compress the valve spring (1) using J 8062  (2) and EN 46119 .

  5. Object Number: 1799064  Size: SH
  6. Remove the valve collets using EN 46117  (1).
  7. Remove the valve spring compressor (2) and the adapter (3).

  8. Object Number: 1799128  Size: SH
  9. Remove the valve spring retainer (1).
  10. Remove the valve spring (2).

  11. Object Number: 1799133  Size: SH
  12. Remove the valves (1).

  13. Object Number: 1799134  Size: SH

    Important: Never reuse a valve stem oil seal.

  14. Remove the valve stem oil seal using EN 46116 and discard.
  15. Repeat these procedures for the remaining valves.

  16. Object Number: 1799136  Size: SH
  17. Remove the cylinder head oil gallery expansion plugs (1).

  18. Object Number: 1799148  Size: SH
  19. Remove the cylinder head coolant threaded plugs (1).