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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 >> Removal Procedure

Removal Procedure

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IMPORTANT: Organize the valve train components when disassembling so they can be reassembled in the same location and matched up with the same components, as previously installed.
  1. Remove the cam cover. Refer to Camshaft Cover Replacement  .
  2. Remove the spark plugs. Refer to Spark Plug Replacement in Engine Controls-4.2 L.
  3. Remove the exhaust and the intake sprocket bolts.
    4. Fig 1: View Of J 44222 Installed Onto Cylinder Head
    GM760724Courtesy of GENERAL MOTORS CORP.
  4. Install the J 44222  onto the cylinder head in order to keep from disturbing the timing chain components. See Special Tools and Equipment .
  5. Adjust the 2 horizontal bolts into the camshaft sprockets to maintain chain tension.
  6. Carefully move the sprockets with the timing chain, off of the camshafts.
  7. Remove the camshaft cap bolts.
    8. Fig 2: Installing Camshaft Retainer Caps
    GM637767Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Place the camshaft caps in a rack to ensure the caps are installed in the same location from which they were removed.
  8. Remove the camshaft caps.
    9. Fig 3: Identifying Camshafts
    GM637768Courtesy of GENERAL MOTORS CORP.
  9. Remove the camshafts.
  10. Using a suitable adapter, apply air pressure to the cylinder.
    11. Fig 4: View Of J 44228 Base Plate
    GM760725Courtesy of GENERAL MOTORS CORP.
  11. Install the J 44228  and compress the valve springs. See Special Tools and Equipment .
    12. Fig 5: View Of Valve Keys
    GM659577Courtesy of GENERAL MOTORS CORP.
  12. Remove the valve keys.
  13. Remove the J 44228  . See Special Tools and Equipment .
    14. Fig 6: View Of Valve Springs & Retainer
    GM637700Courtesy of GENERAL MOTORS CORP.
  14. Remove the valve spring retainer and the valve spring.
    15. Fig 7: View Of J 38820 & Valve Seals
    GM637703Courtesy of GENERAL MOTORS CORP.
  15. Use the J 38820  and remove the seals. See Special Tools and Equipment .
  16. Clean and inspect the cylinder head. Refer to Cylinder Head Cleaning and Inspection  .
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