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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 421 (Engine Mechanical - 4.8L, 5.3L, & 6.0L (On-Vehicle)) >> Repair Instructions >> Valve Stem Oil Seal and Valve Spring Replacement >> Installation Procedure

Installation Procedure

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    Fig 1: Valve Components
    GM721939Courtesy of GENERAL MOTORS CORP.
  1. Clean the cylinder head valve spring seat and/or shim area.
  2. Install the valve spring shim (7) (first design).
  3. Install the valve stem oil seal and shim (2) (second design).

    J 42078  is not required for installation of the second design seal and shim.

    4. Fig 2: Installing Valve Stem Oil Seal
    GM63193Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The valve stem oil seal alignment and position on the valve guide is critical.
    An improperly installed valve stem oil seal may lead to excessive oil consumption, increased vehicle emissions, or component damage.
  4. Install the valve stem oil seal (first design) onto the guide.
    1. Lubricate the valve guide and valve stem oil seal with clean engine oil.
    2. Install the valve stem oil seal (first design) onto the valve stem. Push the seal down until the seal contacts the valve guide.
    3. Use the J 42078  in order to install the valve stem oil seal.

      Push or lightly tap the tool until the tool bottoms against the valve spring shim.

    5. Fig 3: Measuring Valve Stem Oil Seals
    GM63158Courtesy of GENERAL MOTORS CORP.
  5. Measure the valve stem oil seals (first design) for the properly installed height.

    There should be a 18.1-19.1 mm (0.712-0.752 in) gap between the top edge of the oil seal body and the valve spring shim surface.

    6. Fig 4: Valve Components
    GM721939Courtesy of GENERAL MOTORS CORP.
  6. Install the valve spring (5).
  7. Install the valve spring cap (4).
    8. Fig 5: Compress The Valve Spring (Cylinder Head Installed) Using Special Tools
    GM218211Courtesy of GENERAL MOTORS CORP.
  8. Compress the valve spring using the J 38606 .
  9. Install the valve keys.
    • Use grease in order to hold the valve keys in place.
    • Make sure the keys seat properly in the groove of the valve stem.
    • Carefully release the valve spring pressure, making sure the valve keys stay in place.
    • Remove the J 38606 .
    • Tap the end of the valve stem with a plastic faced hammer to seat the keys (if necessary).
    10. Fig 6: J 22794 At Spark Plug Port
    GM65039Courtesy of GENERAL MOTORS CORP.
  10. Remove J 22794  from the spark plug port.
    11. Fig 7: View Of Spark Plug And Spark Plug Seat
    GM14824Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  11. Hand start the spark plug.

    Tighten:  Tighten the spark plug to 15 N.m (11 lb ft).

  12. Install the spark plug wires at the ignition coil.
  13. Install the spark plug wire to the spark plug.
  14. Inspect the wires for proper installation:
    • Push sideways on each boot in order to check for proper installation.
    • Reinstall any loose boot.
  15. Install the valve rocker arm. Refer to Valve Rocker Arm and Push Rod Replacement .
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