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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1497 (Engine Mechanical - 4.2L) >> Repair Instructions >> 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 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Lubricate the valve stems with clean engine oil before installing.
  1. Use the J 38820  to install the valve seals. There is only one size seal.
    Fig 1: Installing Valve Seals
    G02128516Courtesy of GENERAL MOTORS CORP.
  2. Install the valve spring and the valve spring retainer.
    Fig 2: Installing Valve Spring And Valve Spring Retainer
    G02128517Courtesy of GENERAL MOTORS CORP.
  3. Use the J 44228  and compress the valve springs.
    Fig 3: Compressing Valve Springs
    G02128518Courtesy of GENERAL MOTORS CORP.
  4. Install the valve keys.
  5. Remove the J 44228  .
  6. Remove the air pressure to the cylinder.
  7. Coat the camshaft journals, the camshaft journal thrust face, and the camshaft lobes with clean engine oil.
    Fig 4: Installing Valve Keys
    G02128519Courtesy of GENERAL MOTORS CORP.
  8. Install the camshafts to their original position.
    Fig 5: Installing Camshafts
    G02128520Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  9. Install the camshaft caps onto their original journal.

    Tighten 

    Tighten the camshaft cap bolts to 12 N.m (106 lb in).

    Fig 6: Installing Camshaft Caps
    G02128521Courtesy of GENERAL MOTORS CORP.
  10. Carefully move the camshaft sprockets back onto the camshafts and remove the J 44222  .
  11. Install the intake camshaft sprocket washer and the bolt, and the exhaust camshaft actuator bolt.

    Tighten 

    • Tighten the intake camshaft sprocket bolt the first pass to 20 N.m (15 lb ft).
    • Use the J 36660-A  to tighten the intake camshaft sprocket bolt the final pass and additional 100 degrees.
    • Tighten the exhaust camshaft actuator bolt the first pass to 25 N.m (18 lb ft).
    • Use the J 36660-A  to tighten the exhaust camshaft actuator bolt a final pass an additional 135 degrees.
  12. Install the spark plugs. Refer to SPARK PLUGS .
  13. Install the camshaft cover. Refer to CAMSHAFT COVER REPLACEMENT   .
    Fig 7: Installing Intake Camshaft Sprocket Washer And Bolt
    G02128522Courtesy of GENERAL MOTORS CORP.
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