GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • EN 46119 Valve Spring Compressor Adapter
    • J 8062 Valve Spring Compressor
    • J 38820 Valve Stem Seal Remover/Installer

    Object Number: 637610  Size: SH
  1. Remove the spark plugs.

  2. Object Number: 1657356  Size: SH

    Important: Organize the valve train components when disassembling so they can be reassembled in the same location and matched up with the same components as previously installed.

  3. Use J 8062 and EN 46119 to compress the valve spring.

  4. Object Number: 659577  Size: SH
  5. Remove the valve keys.

  6. Object Number: 1657357  Size: SH
  7. Remove J 8062 and EN 46119 .
  8. Remove the valve spring retainer and valve spring.

  9. Object Number: 637701  Size: SH
  10. Remove the valves.

  11. Object Number: 637703  Size: SH
  12. Use J 38820 to remove the valve seals.

  13. Object Number: 637598  Size: SH
  14. Inspect the water jacket plug, for leakage. Replace if necessary.

  15. Object Number: 637599  Size: SH
  16. Inspect the (inner) oil gallery plug, for leakage. Replace if necessary.

  17. Object Number: 637600  Size: SH
  18. Inspect the (end) oil gallery plugs, for leakage. Replace if necessary.