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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 >> Camshaft Position Actuator Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Remove Air Cleaner Assembly - Air Cleaner Assembly Replacement
  2. Remove Camshaft Cover - Camshaft Cover Replacement 
    3. NOTE:

    Perform step 3 if the Intake camshaft position actuator is being removed.

  3. Remove Fuel Pump - Fuel Pump Replacement
    4. Fig 1: Crankshaft Balancer Markings
    GM3682494Courtesy of GENERAL MOTORS COMPANY
  4. Adjust the engine to cylinder 1 top dead center (TDC) of the combustion stroke. Using the crankshaft balancer bolt (3), rotate the crankshaft in direction of engine rotation until the markings (1, 2) line up.
    5. Fig 2: Camshaft Holder
    GM4091100Courtesy of GENERAL MOTORS COMPANY
  5. Install the EN-51367  Camshaft Locking Tool (1).
  6. Remove Timing Chain Upper Guide - Timing Chain Upper Guide Replacement 
    7. Fig 3: Camshaft Position Actuator Marks And Timing Chain Marks
    GM4091103Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The actuator marks (2) should be at the 12 O'clock position when cylinder 1 is at top dead center.

  7. Mark the camshaft timing chain (1) at the corresponding actuator marks (2).
    8. Fig 4: Camshaft Holder
    GM4091100Courtesy of GENERAL MOTORS COMPANY
  8. Remove EN-51367  Camshaft Locking Tool
  9. Using a wrench rotate the intake camshaft clockwise, then release. Repeat this three times to relieve oil pressure from the tensioner.
    10. Fig 5: Camshaft Position Actuator Bolts
    GM4091117Courtesy of GENERAL MOTORS COMPANY
    NOTE:

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

  10. Loosen Camshaft Position Actuator Bolt (1)@Camshaft Position Actuator - [2x]
    11. Fig 6: Timing Chain Retainer And Camshaft Timing Chain
    GM4869144Courtesy of GENERAL MOTORS COMPANY
  11. Pre-Install the EN-51397-2  Timing Chain Retainer (2) to the intake side of the camshaft timing chain (3).
  12. Pre-Install the EN-51397-1  Timing Chain Retainer (5) to the exhaust side of the camshaft timing chain.
  13. Hand tighten the thumb wheels (1, 4) securely.
    14. Fig 7: Exhaust Camshaft And Wrench
    GM4868764Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    The tightening force must be applied gently to the wrench. Using too much force will lead to an overlap of the timing chain that will cause severe engine damages.

  14. Install a suitable wrench (1) at the exhaust camshaft (2).
  15. Apply tension to the chain tensioner by rotating the exhaust camshaft counter-clockwise.
    16. Fig 8: Timing Chain Retainer And Bolt
    GM4869162Courtesy of GENERAL MOTORS COMPANY
  16. While maintaining tension against the exhaust camshaft, install the EN-51397-1  Timing Chain Retainer(1) to the exhaust side of the camshaft timing chain.
    17. CAUTION:

    Refer to Fastener Caution .

  17. Tighten bolt (2) of the EN-51397-1  Timing Chain Retainer (1) to 5 N.m (44 lb in).
  18. Remove the wrench from the exhaust camshaft, and apply to the intake camshaft.
  19. Apply tension to the chain tensioner by slightly rotating the intake camshaft clockwise.
    20. Fig 9: Bolt And Retainer
    GM3936521Courtesy of GENERAL MOTORS COMPANY
  20. While maintaining tension against the intake camshaft, install the EN-51397-2  Timing Chain Retainer (1) to the intake side of the camshaft timing chain.
  21. Tighten the bolt (2) of the EN-51397-2  Timing Chain Retainer to N.m (lb in).
  22. If removing the exhaust camshaft position actuator, proceed to step 28.
    23. Fig 10: Intake Camshaft Position Actuator Bolt
    GM4868075Courtesy of GENERAL MOTORS COMPANY
  23. Remove and DISCARD the intake camshaft position actuator bolt (1).
    24. Fig 11: 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 pry the camshaft to move as far as possible toward the rear/flywheel end of the engine to help gain clearance for actuator removal.
    25. NOTE:

    The camshaft timing chain will be held by the EN-51397  Timing Chain Retainers.

  25. Pull the camshaft actuator straight back and off the nose of the camshaft, leaving it in place temporarily with the timing chain.
    26. Fig 12: Intake Camshaft Position Actuator And Timing Chain
    GM4867895Courtesy of GENERAL MOTORS COMPANY
  26. Disengage and lower the intake camshaft position actuator (1) from the timing chain (2).
    27. Fig 13: Camshaft Position Actuator
    GM4867902Courtesy of GENERAL MOTORS COMPANY
  27. Remove Camshaft Position Actuator (1)
    28. Fig 14: Exhaust Camshaft Position Actuator Bolt
    GM4868090Courtesy of GENERAL MOTORS COMPANY
  28. Remove and DISCARD the exhaust camshaft position actuator bolt (1).
    29. Fig 15: 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.

  29. Position a screwdriver or small pry bar between a camshaft cap and camshaft lobe. Carefully pry the camshafts to move as far as possible toward the rear/flywheel end of the engine to help gain clearance for actuator removal.
    30. NOTE:

    The camshaft timing chain will be held by the EN-51397  Timing Chain Retainers.

  30. Pull the camshaft actuator straight back and off the nose of the camshaft, leaving it in place temporarily with the timing chain.
    31. Fig 16: Exhaust Camshaft Position Actuator And Timing Chain
    GM4868808Courtesy of GENERAL MOTORS COMPANY
  31. Disengage and lower the exhaust camshaft position actuator (1) from the timing chain (2)
    32. Fig 17: Camshaft Position Actuator
    GM4868812Courtesy of GENERAL MOTORS COMPANY
  32. Remove Camshaft Position Actuator (1)
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