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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Mechanical (Repair Instructions -- 1 Of 3) -- 4.8L, 5.3L & 6.0L) >> Repair Instructions (On-Vehicle & Off-Vehicle - Part 1) >> On-Vehicle Repair Instructions >> Valve Stem Oil Seal and Valve Spring Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Clean the cylinder head valve spring seat and/or shim area.
  2. Lubricate the valve guide and valve stem oil seal with clean engine oil.
  3. Install the valve stem oil seal and shim (1, 5).
    4. Fig 1: View Of Valve Stem & Valve Spring Components
    GM832259Courtesy of GENERAL MOTORS CORP.
  4. Install the valve spring (4).
  5. Install the valve spring cap (3).
    6. Fig 2: View Of Valve Stem & Valve Spring Components
    GM832259Courtesy of GENERAL MOTORS CORP.
  6. Compress the valve spring using the J 38606  .
    7. Fig 3: Compress The Valve Spring (Cylinder Head Installed) Using Special Tools
    GM218211Courtesy of GENERAL MOTORS CORP.
  7. 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.
  8. Remove the J 22794  from the spark plug port.
    9. Fig 4: Removing J 22794 From Spark Plug Port
    GM65039Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  9. Hand start the spark plug.

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

    10. Fig 5: View Of Spark Plug And Sparkplug Seat
    GM14824Courtesy of GENERAL MOTORS CORP.
  10. Install the spark plug wires at the ignition coil.
  11. Install the spark plug wire to the spark plug.
  12. Inspect the wires for proper installation:
    • Push sideways on each boot in order to check for proper installation.
    • Reinstall any loose boot.
  13. Install the rocker arm. Refer to Valve Rocker Arm and Push Rod Replacement .
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