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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1443 (Engine Mechanical - 4.2L (Ll8)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Valve Stem Oil Seal And Valve Spring Replacement >> Installation Procedure

Installation Procedure

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    IMPORTANT: Lubricate the valve stems with clean engine oil before installing.
    Fig 1: View Of J 38820 & Valve Seals
    GM637703Courtesy of GENERAL MOTORS CORP.
  1. Use the J 38820  to install the valve seals. See Special Tools and Equipment . There is only one size seal.
    2. Fig 2: View Of Valve Springs & Retainer
    GM637700Courtesy of GENERAL MOTORS CORP.
  2. Install the valve spring and the valve spring retainer.
    3. Fig 3: View Of J 44228 Base Plate
    GM760725Courtesy of GENERAL MOTORS CORP.
  3. Use the J 44228  and compress the valve springs. See Special Tools and Equipment .
    4. Fig 4: View Of Valve Keys
    GM659577Courtesy of GENERAL MOTORS CORP.
  4. Install the valve keys.
  5. Remove the J 44228  . See Special Tools and Equipment .
  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. Fig 5: Identifying Camshafts
    GM637768Courtesy of GENERAL MOTORS CORP.
  8. Install the camshafts to their original position.
    9. Fig 6: Installing Camshaft Retainer Caps
    GM637767Courtesy 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).

    10. Fig 7: View Of J 44222 Installed Onto Cylinder Head
    GM760724Courtesy of GENERAL MOTORS CORP.
  10. Carefully move the camshaft sprockets back onto the camshafts and remove the J 44222  . See Special Tools and Equipment .
  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 Plug Replacement in Engine Controls-4.2 L.
  13. Install the camshaft cover. Refer to Camshaft Cover Replacement  .
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