GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Colorado Pickup - 2WD 🢒 Engine 🢒 Engine Mechanical - 2.8L (LK5) 🢒 Cylinder Head Assemble

Tools Required

    • J 8062 Valve Spring Compressor
    • J 42037 Valve Spring Compressor Adapter
    • J 38820 Valve Stem Seal Remover/Installer

    Object Number: 637600 Size: SH
  1. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads.

    2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2. Install the (end) oil gallery plugs.

    3. Tighten
    Tighten the oil gallery plugs to 38 N·m (28 lb ft).


    Object Number: 637599 Size: SH
  3. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the plugs.
  4. Install the (inner) oil gallery plugs.

    5. Object Number: 637598 Size: SH
  5. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the plug.
  6. Install the water jacket plug.

    7. Object Number: 858302 Size: SH
  7. Use J 38820 to install the valve seals. There is only one size valve seal.

    8. Object Number: 858300 Size: SH

    Important: Lubricate the valve stems with clean engine oil before installing.

  8. Install the valves. 0.075 mm (0.003 in) oversized valves are available if the valve guides needed to be reamed. Use the same (original size) valve seal.

    9. Object Number: 858298 Size: SH
  9. Install the valve spring and the valve spring retainer.

    10. Object Number: 858292 Size: SH
  10. Use J 8062  (2) and J 42037  (1) to compress the valve spring.

    11. Object Number: 858296 Size: SH
  11. Install the valve keys.
  12. Remove J 8062 and J 42037 .

    13. Object Number: 64315 Size: SH
  13. 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 .
  14. Install the remaining valves, springs, and other components.

    15. Object Number: 858289 Size: SH

    Important: Do not try to centralize the electrode on the spark plug. The electrode is offset by design.

  15. Install the spark plugs.

    16. Tighten
    Tighten the spark plugs to 18 N·m (13 lb ft).


    Object Number: 954132 Size: SH
  16. Install the A.I.R. injection pipe gasket.
  17. Install the A.I.R. injection pipe cover.
  18. Install the A.I.R. injection pipe studs.

    19. Tighten
    Tighten the studs to 25 N·m (18 lb ft).