LEMON Manuals: Even more car manuals for everyone
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 >> Removal Procedure

Removal 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: 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 PLUGS .
  3. Remove the exhaust and the intake sprocket bolts.
    Fig 1: Removing Exhaust And Intake Sprocket Bolts
    G02128509Courtesy of GENERAL MOTORS CORP.
  4. Install the J 44222  onto the cylinder head in order to keep from disturbing the timing chain components.
  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.
    Fig 2: Removing Camshaft Caps
    G02128510Courtesy of GENERAL MOTORS CORP.
  9. Remove the camshafts.
  10. Using a suitable adapter, apply air pressure to the cylinder.
    Fig 3: Removing Camshafts
    G02128511Courtesy of GENERAL MOTORS CORP.
  11. Install the J 44228  and compress the valve springs.
    Fig 4: Compressing Valve Springs
    G02128512Courtesy of GENERAL MOTORS CORP.
  12. Remove the valve keys.
  13. Remove the J 44228  .
    Fig 5: Removing Valve Keys
    G02128513Courtesy of GENERAL MOTORS CORP.
  14. Remove the valve spring retainer and the valve spring.
    Fig 6: Removing Valve Spring Retainer And Valve Spring
    G02128514Courtesy of GENERAL MOTORS CORP.
  15. Use the J 38820  and remove the seals.
  16. Clean and inspect the cylinder head. Refer to Cylinder Head Cleaning and Inspection .
    Fig 7: Removing Seals
    G02128515Courtesy of GENERAL MOTORS CORP.
scientia non olet · About LEMON Manuals