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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 418 (Engine Mechanical - 4.2L 6-Cylinder (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 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Use the J 38820 to install the valve seals. There is only one size seal.
    Fig 1: Installing Valve Seals
    G01706275Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Lubricate the valve stems with clean engine oil before installing.
  2. Install the valves. 0.075 mm (0.003 in) oversized valves are available if the valve guides need to be reamed. Use the same (original size) valve seal.
    3. Fig 2: Installing Valves
    G01706276Courtesy of GENERAL MOTORS CORP.
  3. Install the valve spring and the valve spring retainer.
    4. Fig 3: Installing Valve Spring And Retainer
    G01706277Courtesy of GENERAL MOTORS CORP.
  4. Use the J 44228 and compress the valve springs.
    5. Fig 4: Compressing Valve Springs
    G01706278Courtesy of GENERAL MOTORS CORP.
  5. Install the valve keys.

    Remove the J 44228.

    6. Fig 5: Installing Valve Keys
    G01706279Courtesy of GENERAL MOTORS CORP.
  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.
  8. Install the camshafts to their original position.
    9. Fig 6: Installing Camshafts
    G01706280Courtesy of GENERAL MOTORS CORP.
  9. Install the camshaft caps onto their original journal.
    NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    Tighten 

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

    10. Fig 7: Installing Camshaft Caps
    G01706281Courtesy of GENERAL MOTORS CORP.
  10. Carefully move the camshaft sprockets back onto the camshafts and remove the J 44222.
    11. Fig 8: Removing J 44222
    G01706282Courtesy of GENERAL MOTORS CORP.
  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 30 N.m (22 lb ft).
    • Use the J 36660-A to tighten the intake camshaft sprocket bolt the final pass and additional 135 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 Plug Replacement in Engine Controls-4.2 L.
  13. Install the camshaft cover. Refer to Camshaft Cover Replacement .
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