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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 417 (Engine Mechanical - 3.6L (LGX) - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Camshaft Position Actuator Replacement - Bank 1 >> Removal Procedure

Removal Procedure

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  1. Remove Camshaft Cover - Right Side Camshaft Cover Replacement - Right Side 
    2. Fig 1: Laser Etched Flat
    GM4216942Courtesy of GENERAL MOTORS COMPANY
  2. Rotate the engine clockwise using the crankshaft dampener retaining bolt until laser etched flat is facing up (This will put the camshafts in a rested position and aid in removal).
    3. Fig 2: Opened End Wrench On Cast Hexagonal Portion Of Camshaft
    GM4170120Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Torque Reaction Against Timing Drive Chain Caution .

    NOTE:

    Do NOT remove or back out the camshaft position actuator bolt(s). Simply break them loose from their fully-torqued position. The position actuators must stay firmly attached until the retaining tools are in place, but they should be broken loose while the chain is still tight and in position.

  3. Use an opened end wrench on the cast hexagonal portion of the camshafts to hold them in place while breaking the actuator fasteners loose to prevent camshaft rotation.
    4. Fig 3: Loosening Intake And Exhaust Camshaft Position Actuator Retaining Bolts
    GM4170131Courtesy of GENERAL MOTORS COMPANY
  4. Loosen both intake and exhaust camshaft position actuator retaining bolts but DO NOT remove.
  5. Clean off any oil residue on camshaft position actuators.
    6. NOTE:

    Marking the relationship of the timing chain to actuators is critical for timing alignment.

    Fig 4: Position Of Chain To Camshaft Position Actuator
    GM4216989Courtesy of GENERAL MOTORS COMPANY
  6. Mark the position of the chain to the camshaft position actuator - intake.
  7. Mark the position of the chain to the camshaft position actuator - exhaust.
    8. Fig 5: Camshaft Front Cap Bolt Tightening Sequence
    GM4167703Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT remove or loosen any other camshaft bearing caps at this time, even if you intend to eventually remove the camshaft.

  8. Remove camshaft front cap bolts (1)
    9. Fig 6: Camshaft Front Cap
    GM4167757Courtesy of GENERAL MOTORS COMPANY
  9. Remove the camshaft front cap (1).
    10. Fig 7: Locating Front Cover And Cylinder Head Surface Cleaning Areas
    GM4168095Courtesy of GENERAL MOTORS COMPANY
  10. Clean RTV from front cover and cylinder head surface at the indicated locations prior to timing retainer tool installation.
    11. Fig 8: Loosen Wingnut To Open Clamping Area Of EN-51333-1 Retainer
    GM4645191Courtesy of GENERAL MOTORS COMPANY
  11. Loosen the wingnut (1) to open the clamping area of EN-51333-1  retainer.
    12. NOTE:

    Do NOT overtighten the bolts. The EN-51333-1  retainer should be able to slide slightly via the slots the bolts go through. This fore/aft movement will allow easier removal and installation of the chain later.

  12. Install the EN-51333-1  retainer on the exhaust side front cover and cylinder head by screwing in the bolts (2) on the EN-51333-1  retainer finger-tight.
    13. Fig 9: Loosen Wingnut To Open Clamping Area Of EN-51333-2 Retainer
    GM4645252Courtesy of GENERAL MOTORS COMPANY
  13. Loosen the wingnut (1) to open the clamping area of EN-51333-2  retainer.
    14. NOTE:

    Do NOT overtighten the bolts. The EN-51333-2  retainer should be able to slide slightly via the slots the bolts go through. This fore/aft movement will allow easier removal and installation of the chain later.

  14. Install the EN-51333-2  retainer on the intake side front cover and cylinder head by screwing in the bolts (2) on the EN-51333-2  retainer finger-tight.
    15. Fig 10: Wrench On Cast Hexagonal Portion Of Exhaust Camshaft
    GM4170806Courtesy of GENERAL MOTORS COMPANY
  15. Using a wrench on the cast hexagonal portion of the intake camshaft, rotate the camshaft toward the exhaust camshaft and then release. Repeat this action three to fully drain the tensioners of oil.
  16. Rotate the intake camshaft toward the exhaust camshaft and hold.
    17. NOTE:

    Do NOT tighten the wingnut with a tool of any kind. Firm finger-tightening is sufficient.

  17. Tighten wingnut (1) so EN-51333-2  retainer closes and firmly grasps timing chain.
  18. Tighten the EN-51333-2  retainer bolts.
    19. Fig 11: Wrench On Cast Hexagonal Portion Of Exhaust Camshaft And Wing Nut
    GM4663487Courtesy of GENERAL MOTORS COMPANY
  19. Using a wrench on the cast hexagonal portion of the exhaust camshaft, rotate the camshaft toward the intake camshaft and then release. Repeat this action three to fully drain the tensioners of oil.
  20. Rotate the exhaust camshaft toward the intake camshaft and hold.
    21. NOTE:

    Do NOT tighten the wingnut with a tool of any kind. Firm finger-tightening is sufficient.

  21. Tighten wingnut (1) so EN-51333-1  retainer closes and firmly grasps timing chain.
  22. Tighten the EN-51333-1  retainer bolts.
    23. Fig 12: Bolt And Exhaust Camshaft Position Actuator
    GM4647651Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The Exhaust camshaft position actuator must be removed first to provide enough chain slack to remove the intake Position Actuator.

  23. Fully remove the bolt (1) for the exhaust camshaft position actuator.
    24. Fig 13: Prying Camshaft Toward Rear/Flywheel End Of Engine
    GM4170757Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Do not pry against the face of the camshaft position actuators or the position actuator retaining bolts as the position actuators will be damaged.

  24. Position a screwdriver or small pry bar between a camshaft cap and camshaft lobe. Carefully move/pry the camshafts as far as possible toward the rear/flywheel end of the engine.
    25. Fig 14: Camshaft Position Actuator
    GM4647671Courtesy of GENERAL MOTORS COMPANY
  25. Slide the camshaft position actuator (1) forward and off the end of the exhaust camshaft.
    26. Fig 15: Tilt Camshaft Position Actuator Forward And Out/Away From Engine
    GM4647691Courtesy of GENERAL MOTORS COMPANY
  26. Tilt the camshaft position actuator forward and out/away from the engine.
  27. Repeat steps 11-26 to remove the intake camshaft position actuator.
    NOTE:

    DO NOT remove the EN-51333  Timing Chain Retainer Set, they are holding the cam chain to maintain the proper timed position.

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