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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 271 (Engine Mechanical - 4.8L, 5.3L, 6.0L Or 6.2L (4 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 3) >> Cylinder Head Assemble >> Procedure

Cylinder Head Assemble: Procedure

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    Fig 1: Valve Stem Keys, Valve Spring Cap & Valve Spring
    GM1559870Courtesy of GENERAL MOTORS CORP.
  1. Clean the cylinder head valve spring shim area.
    2. IMPORTANT: When using the valves and related components again, install the parts to their original location.
  2. Install the valves (228) into the proper port. Refer to Separating Parts .
  3. Install the valve stem oil seal (222).
  4. Install the valve spring (223).
  5. Install the valve spring cap (224).
    6. Fig 2: Compressing Valve Spring
    GM260151Courtesy of GENERAL MOTORS CORP.
  6. Using the J 8062  , compress the valve spring. See Special Tools .
  7. Install the valve stem keys.
    1. Use grease in order to hold the keys in place and remove the J 8062  . See Special Tools .
    2. Ensure the keys seat properly in the groove of the valve stem.
    3. Tap the end of the valve stem with a plastic face hammer to seat the keys, if necessary.
    8. Fig 3: Measuring Valve Spring Installed Height
    GM64315Courtesy of GENERAL MOTORS CORP.
  8. Using a ruler, measure the valve spring installed height.

    Measure from the base of the valve spring to the top of the valve spring.

    Specification: 

    • If the installed height exceeds 46.25 mm (1.82 in), install a valve spring shim of approximately 0.5 mm (0.02 in) thick.
    • Do not shim the valve spring to obtain less than the specified height.

      Do not assemble the components without a spring shim on the cylinder head.

  9. Install the remaining valves, springs, and other components.
    10. Fig 4: Locating Coolant Temperature Sensor
    GM1559875Courtesy of GENERAL MOTORS CORP.
  10. Install sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the coolant temperature sensor (725).
    11. NOTE: Refer to Fastener Notice .
  11. Install the coolant temperature sensor into the left cylinder head.

    Tighten:  Tighten the coolant temperature sensor to 20 N.m (15 lb ft).

    12. Fig 5: Locating Coolant Plug
    GM1559878Courtesy of GENERAL MOTORS CORP.
  12. Install sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the cylinder head plug (229).
  13. Install the cylinder head plug to the right cylinder head.

    Tighten:  Tighten the cylinder head plug to 20 N.m (15 lb ft).

    14. Fig 6: Locating Cylinder Head Core Hole Plug
    GM1559873Courtesy of GENERAL MOTORS CORP.
  14. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the sides of the cylinder head plugs (216).
  15. Install the cylinder head plugs into the cylinder head.

    A properly installed plug should be installed 2.5 mm (0.1 in) below the end face of the head.

    16. Fig 7: Rivet-Type Plug
    GM2046466Courtesy of GENERAL MOTORS CORP.
  16. Second design applications use a rivet-type plug (1) at the top rear coolant passage of each cylinder head. If service of a leaking plug is required, it is necessary to remove the cylinder head from the engine to properly remove the plug.
    17. Fig 8: Engine Coolant Air Bleed Cover, Bolts & Seals
    GM1408862Courtesy of GENERAL MOTORS CORP.
  17. If plug removal is required, install a first design coolant air bleed cover and bolt to complete the repair.
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