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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Mechanical - 1.5L (LYX)) >> Repair Instructions - On Vehicle >> Valve Stem Oil Seal And Valve Spring Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Pliers And Intake Valve Stem Oil Seals
    GM2373171Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Valve stem oil seal sets will contain 2 different colored seals, black and green. The set of 8 seals that are green should be installed onto the exhaust valves.

  1. Using the EN-46116  installer (1), install NEW valve stem oil seal (2).
    2. Fig 2: Valve Springs And Retainers
    GM3216197Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Make sure that the valve springs and the valve spring retainers are installed in their original position.

  2. Install the exhaust valve spring (1), or the intake valve spring (3) and the upper valve spring retainer (2).
    3. Fig 3: Valve Spring Retainer And Valve Spring
    GM2678153Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    The valve stem keys must correctly seat in the valve spring cap. Engine damage may occur by not installing properly.

  3. Using the EN-50717-2  compressor, push down the valve spring retainer (1) and compress the valve spring (3) until the valve keys (2) can be inserted.
  4. Carefully insert the valve keys (2), so that they are properly installed into the valve stem grooves.
  5. Carefully release the tension from the EN-50717-2  compressor.
  6. Inspect the valve keys (2) and valve spring retainer (1) for proper seat.
    7. Fig 4: Valve Stem Oil Seal and Valve Spring Tools
    GM3701707Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    To keep the valve seated in the valve seat, ensure that air pressure is always applied to the combustion chamber of the treated cylinder.

  7. Repeat the procedure with the remaining valves and cylinders.
  8. Transfer the EN-50717-1  stands, EN-51511  plug and the EN-50717-2  compressor (1 - 6) as needed.
  9. Remove the EN-51511  plug from the injector bores.
  10. Remove EN-50717-1  stands and the EN-50717-2  compressor from the cylinder head.
  11. Install Hydraulic Valve Lash Adjuster Arm Replacement 
  12. Install Spark Plug Replacement
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