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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1537 (Engine Mechanical (Repair Instructions 1 Of 3) - 5.7L) >> 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 car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: The LS6 engine uses a copper plated spring shim. A shim of the same design must be installed during assembly.
    Fig 1: Valve Stem Keys
    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).

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

    4. Fig 2: J 42078, Valve Stem Oil Seal & Bolt
    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, and increased vehicle emissions.
  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 oil seal.

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

    5. Fig 3: Measuring Valve Stem Oil Seal For Properly Installed Height
    GM63158Courtesy of GENERAL MOTORS CORP.
  5. Measure the valve stem oil seal (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: Compress The Valve Spring (Cylinder Head Installed) Using Special Tools
    GM218211Courtesy of GENERAL MOTORS CORP.
  6. Install the valve spring to the J 38606  .
  7. Compress the valve spring using the J 38606  .
  8. Install the valve spring to the cylinder head.
    9. Fig 5: Valve Stem Keys
    GM721939Courtesy of GENERAL MOTORS CORP.
  9. Install the valve spring cap (4).
  10. Install the valve stem keys (3).
    • Use grease to hold the keys (3) in place and remove J 38606  .
    • Make sure the keys (3) 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 to the valve stem with a plastic faced hammer to seat the keys (if necessary).
    11. Fig 6: Install/Remove J 22794 Spark Plug Hole
    GM353918Courtesy of GENERAL MOTORS CORP.
  11. Disconnect and remove the air supply from the J 22794  .
  12. Remove the J 22794  from the spark plug hole.
    13. Fig 7: Measuring Valve Spring Installed Height
    GM64315Courtesy of GENERAL MOTORS CORP.
  13. Measure the valve spring installed height using a ruler.

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

    • 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.

  14. Remove the air hose from the J 22794  .
    15. Fig 8: View Of Spark Plug And Sparkplug Seat
    GM14824Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  15. Instal the spark plug by hand until snug.
  16. Tighten the spark plug.

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

    17. Fig 9: Spark Plug Wire
    GM74069Courtesy of GENERAL MOTORS CORP.
  17. Install the spark plug wire to the spark plug.
  18. Install the valve rocker arms. Refer to Valve Rocker Arm and Push Rod Replacement .
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