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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1020 (Engine Mechanical - 6.6L (LLY)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Valve Stem Oil Seal and Valve Spring Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Air pressure should remain applied to the cylinder for installation.
  1. Install the valve spring lower seat.
  2. Install the valve stem seal using J 44640  .
    3. Fig 1: Installing Valve Stem Using J 44640
    GM663571Courtesy of GENERAL MOTORS CORP.
  3. Install the valve spring (3), the painted end of the valve spring goes toward the cylinder head.
  4. Install the valve spring upper seat (2).
    5. Fig 2: View Of Valve Stem & Spring Components
    GM663504Courtesy of GENERAL MOTORS CORP.
    CAUTION: Compressed valve springs have high tension against the valve spring compressor. Valve springs that are not properly compressed by or released from the valve spring compressor can be ejected from the valve spring compressor with intense force. Use care when compressing or releasing the valve spring with the valve spring compressor and when removing or installing the valve stem keys. Failing to use care may cause personal injury.
  5. Using J 44646  compress the valve spring.
    6. Fig 3: Compressing Valve Spring Using J 44646
    GM702702Courtesy of GENERAL MOTORS CORP.
  6. Install the valve keys to the valve stem.
    7. NOTE: The valve stem keys must correctly seat in the valve spring cap. Engine damage may occur by not installing properly.
  7. Carefully release the valve spring pressure. Make sure the valve keys stay in place.
  8. Continue to install the 3 remaining valve stem seals for the cylinder.
  9. Release the compressed air holding the valves in place.
  10. Remove J 26999-20  (1) from the glow plug hole.
    11. Fig 4: View Of J 26999-20 & J 26999
    GM702726Courtesy of GENERAL MOTORS CORP.
  11. Continue to replace the valve stem seals on the remaining cylinders using the above procedures.
  12. Install the glow plug. Refer to Glow Plug Replacement - Bank 1 or Glow Plug Replacement - Bank 2 .
  13. Install the valve rocker arm shaft, the valve bridges, and the push rods. Refer to Valve Rocker Arm, Shaft, and Push Rod Replacement .
  14. Install the upper and lower fan shroud. Refer to Fan Shroud Replacement - Lower and Fan Shroud Replacement - Upper (W/O M74) or Fan Shroud Replacement - Upper (W/M74) in Engine Cooling.
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