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Home >> Buick >> 2004 >> Century Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 134 (Engine Mechanical - 3.8L) >> 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 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the left or the right valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Left  or Valve Rocker Arm Cover Replacement - Right .
    2. IMPORTANT: Rotate the engine so that the piston in the cylinder being worked on is at top dead center before removing the valve locks. This will eliminate the possibility of the valve accidentally falling inside the cylinder.
  2. Remove the valve rocker arms and the push rods. Refer to Valve Rocker Arm and Push Rod Replacement .
  3. Remove the spark plug. Refer to Spark Plug Replacement in Engine Controls - 3.8L.
  4. Install the J 23590  to the spark plug port and apply compressed air in order to hold the valves closed.
    5. Fig 1: Identifying J 23590
    GM406031Courtesy of GENERAL MOTORS CORP.
  5. Install the J 38606  on the valve spring.
    6. Fig 2: Identifying J 38606 & Valve Spring
    GM406033Courtesy of GENERAL MOTORS CORP.
  6. Compress the valve spring using the J 38606  .
  7. Remove the valve locks.
    8. Fig 3: Compressing Valve Spring
    GM190527Courtesy of GENERAL MOTORS CORP.
  8. Remove the valve spring and cap.
  9. Remove the valve stem oil seal.
    10. Fig 4: Identifying Valve Stem Oil Seal
    GM406035Courtesy of GENERAL MOTORS CORP.
  10. Inspect the valve spring for bent, cracked, or broken parts. Replace the valve spring if damaged. Refer to Cylinder Head Cleaning and Inspection .
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