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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 >> Removal Procedure

Removal 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.
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. Install the J 44222 onto the cylinder head in order to keep from disturbing the timing chain components.
    5. Fig 1: Installing J 44222 Onto Cylinder Head
    G01706267Courtesy of GENERAL MOTORS CORP.
  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.
    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 2: Removing Camshaft Caps
    G01706268Courtesy of GENERAL MOTORS CORP.
  9. Remove the camshafts.
    10. Fig 3: Removing Camshafts
    G01706269Courtesy of GENERAL MOTORS CORP.
  10. Using a suitable adapter, apply air pressure to the cylinder.
  11. Install the J 44228 and compress the valve springs.
    12. Fig 4: Installing J 44228 And Compressing Valve Springs
    G01706270Courtesy of GENERAL MOTORS CORP.
  12. Remove the valve keys.
    13. Fig 5: Removing Valve Keys
    G01706271Courtesy of GENERAL MOTORS CORP.
  13. Remove the J 44228.
  14. Remove the valve spring retainer and the valve spring.
    15. Fig 6: Removing Valve Spring Retainer And Valve Spring
    G01706272Courtesy of GENERAL MOTORS CORP.
  15. Remove the valves.
    16. Fig 7: Removing Valves
    G01706273Courtesy of GENERAL MOTORS CORP.
  16. Use the J 38820 and remove the seals.
    17. Fig 8: Removing Seals
    G01706274Courtesy of GENERAL MOTORS CORP.
  17. Clean and inspect the cylinder head. Refer to Cylinder Head Cleaning and Inspection in Engine Mechanical - 4.2 L Unit Repair.
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