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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical - 1.2L (LIH)) >> Repair Instructions >> Camshaft Intake Sprocket Replacement

Camshaft Intake Sprocket Replacement

WARNING: This page is about a different variant/trim than selected.

Special Tools

Equivalent regional tools: Special Tools 

Removal Procedure

  1. Camshaft Cover - Remove - Camshaft Cover Replacement 
  2. Camshaft Position Actuator Solenoid Valve - Intake - Remove - Camshaft Position Actuator Solenoid Valve Replacement - Intake
  3. Camshaft Position Actuator Solenoid Valve - Exhaust - Remove - Camshaft Position Actuator Solenoid Valve Replacement - Exhaust
  4. Starter - Remove - Starter Replacement (LIH)
  5. Timing Belt Lower Cover - Remove - Timing Belt Lower Cover Replacement 
  6. GM5274424Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure the EN-52476  Flywheel Locking Tool (1) is properly assembled, and the timing pin plunger (3) is retracted. When using the EN-52476  Flywheel Locking Tool as an timing device, adjust the pawl armature (4) so the pawl is not engaging the teeth once installed.

    EN-52476  Flywheel Locking Tool (1) - Install

  7. Bolt (2) - Install and tighten [2x]
  8. GM5371396Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Balancer Bolt (1) - Install

    9. NOTE:

    The engine timing is located 118.14 degrees after top dead center.

  9. Adjust the engine to the engine timing position. Set the crankshaft in direction of engine rotation until the pin (2) of the EN-52476  Flywheel Locking Tool snaps automatically into the hole of the automatic transmission flex plate (3) or the engine flywheel.
  10. GM5372524Courtesy of GENERAL MOTORS COMPANY

    If the engine timing is adjusted correctly, the valves (1, 3) of the 3rd cylinder must be closed. Also the 2 flats (2) must stand in vertical position.

  11. GM5372525Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The EN-52457  Camshaft Locking Tool has an identification for which side it must be used. Place the EN-52457  Camshaft Locking Tool with the identification mark I (1) facing upwards. Also the surface has an identification for the intake (2).

    EN-52457-2  Locking Tool - Intake (5) - Install

  12. Bolt (3, 4) - Install and tighten
  13. GM5372539Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The EN-52457  Camshaft Locking Tool has an identification for which side it must be used. Place the EN-52457  Camshaft Locking Tool with the identification mark I (1) facing upwards. Also the surface has an identification for the exhaust (2).

    EN-52457-2  Locking Tool - Exhaust (5) - Install

  14. Bolt (3, 4) - Install and tighten [2x]
  15. GM5372540Courtesy of GENERAL MOTORS COMPANY

    Bolt @ EN-52458  VCP Locking Tool (2) - Loosen

  16. EN-52458  VCP Locking Tool (1) - Adjust
  17. EN-52458  VCP Locking Tool (1) - Install
    18. CAUTION:

    Fastener Caution

  18. Bolt (3) - Install and tighten [4x] 6 N.m (53 lb in)
  19. Bolt (2) - Tighten
  20. GM5372542Courtesy of GENERAL MOTORS COMPANY

    Loosen the timing belt tensioner bolt (2) and release the tension from the timing belt tensioner (1). Rotate the timing belt tensioner counter-clockwise.

  21. EN-955-10-A  locking pin (3) - Install
  22. GM5372544Courtesy of GENERAL MOTORS COMPANY

    Install the EN-52458-3  locking tool (2) to the holes in the camshaft sprocket.

  23. Check that the EN-52458-3  locking tool (2) sits correctly in the hole of the camshaft sprocket.
  24. Bolt (3, 4) - Tighten [2x] 20 N.m (15 lb ft)
  25. Camshaft Sprocket Actuator Valve Bolt (1) - Loosen [2x]
  26. Bolt (3, 4) - Loosen [2x]
  27. GM5372540Courtesy of GENERAL MOTORS COMPANY

    Bolt (3) - Remove [4x]

  28. EN-52458  locking tool (1) - Remove
  29. GM5372546Courtesy of GENERAL MOTORS COMPANY

    Camshaft Sprocket Actuator Valve Bolt (1) - Remove and DISCARD [2x]

  30. GM5372547Courtesy of GENERAL MOTORS COMPANY

    Camshaft Sprocket (1) - Remove [2x]

Installation Procedure

  1. GM5372547Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The front of the camshaft sprockets is recognizable by the pin (2).

    Camshaft Sprocket (1) - Install [2x]

  2. GM5372546Courtesy of GENERAL MOTORS COMPANY

    Camshaft Sprocket Actuator Valve Bolt (1) - Install NEW and hand tighten [2x]

  3. GM5372548Courtesy of GENERAL MOTORS COMPANY

    Timing Belt Tensioner (1) - Install

  4. Timing Belt Tensioner Bolt (2) - Loosely install
  5. Timing Belt Idler Pulley (4) - Install
    6. CAUTION:

    Fastener Caution

  6. Timing Belt Idler Pulley Bolt (3) - Install and tighten 36 N.m (27 lb ft)
  7. GM5389395Courtesy of GENERAL MOTORS COMPANY

    EN-955-10-A  pin (2) - Remove

    8. NOTE:

    The nominal position of the timing belt tensioner is when the mobile index (5) is between the gap in the front plate (4).

  8. Tension the timing belt tensioner (1) to the nominal position and an additional a = 10 degrees. Rotate the timing belt tensioner clockwise.
  9. Timing Belt Tensioner Bolt (3) - Tighten 36 N.m (27 lb ft)
  10. GM5372540Courtesy of GENERAL MOTORS COMPANY

    Bolt (2) - Loosen

  11. Slide the EN-52458  VCP Locking Tool (1) apart.
  12. EN-52458  VCP Locking Tool (1) - Install
  13. Bolt (3) - Install and tighten [4x] 6 N.m (53 lb in)
  14. Bolt (2) - Tighten
  15. GM5389396Courtesy of GENERAL MOTORS COMPANY

    Install the EN-52458-3  locking tool (2) to the holes in the intake camshaft sprocket.

  16. Check that the EN-52458-3  locking tool (2) sits correctly in the hole of the camshaft sprocket.
    17. NOTE:

    A second technician is required.

  17. Tighten the EN-52458-3  locking tool (2) to 20 N.m (15 lb ft). Rotate the EN-52458-3  locking tool clockwise.
  18. While holding the EN-52458-3  locking tool to 20 N.m (15 lb ft), tighten the bolt (3) to 20 N.m (15 lb ft).
    19. CAUTION:

    Torque-to-Yield Fastener Warning

  19. Camshaft Sprocket Actuator Valve Bolt (1) @ Intake Camshaft - Tighten
    1. First Pass: 50 N.m (37 lb ft)
    2. Final Pass: 28 degrees, use the EN-45059  meter
  20. GM5389399Courtesy of GENERAL MOTORS COMPANY

    Install the EN-52458-3  locking tool (3) to the holes in the exhaust camshaft sprocket.

  21. Check that the EN-52458-3  locking tool (3) sits correctly in the hole of the camshaft sprocket.
    22. NOTE:

    A second technician is required.

  22. Tighten the EN-52458-3  locking tool (3) to 20 N.m (15 lb ft). Rotate the EN-52458-3  locking tool clockwise.
  23. While holding the EN-52458-3  locking tool to 20 N.m (15 lb ft), tighten the bolt (2) to 20 N.m (15 lb ft).
    24. CAUTION:

    Torque-to-Yield Fastener Warning

  24. Camshaft Sprocket Actuator Valve Bolt (1) @ Exhaust Camshaft - Tighten
    1. First Pass: 50 N.m (37 lb ft)
    2. Final Pass: 28 degrees, use the EN-45059  meter
  25. GM5372540Courtesy of GENERAL MOTORS COMPANY

    Bolt (3) - Remove [4x]

  26. EN-52458  locking tool (1) - Remove
  27. GM5372539Courtesy of GENERAL MOTORS COMPANY

    Bolt (3, 4) - Remove [2x]

  28. EN-52457-1  locking tool (5) - Remove
  29. GM5372525Courtesy of GENERAL MOTORS COMPANY

    Bolt (3, 4) - Remove

  30. EN-52457-2  locking tool (5) - Remove
  31. GM5274430Courtesy of GENERAL MOTORS COMPANY

    Turn the crankshaft 720 degrees in the direction of engine rotation by the crankshaft balancer bolt (1) until the pin (2) of the EN-52476  lock tool snaps automatically into the hole (3) of the automatic transmission flex plate or the engine flywheel.

  32. GM5389401Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The nominal position of the timing belt tensioner is when the mobile index (2) sits in the middle between the gap of the front plate (3). A tolerance is given when half of the hole (4) is visible (+/- 5 degrees).

    Check that the timing belt tensioner (1) is in the nominal position.

  33. If not, repeat the step to adjust the tensioner.
  34. GM5372525Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The EN-52457  Camshaft Locking Tool has an identification for which side of the tool must be facing upward. Place the EN-52457  Camshaft Locking Tool with the I (1) facing upwards. The surface of the tool will also have the identification intake (2) for use on the intake camshaft.

    EN-52457-2  locking tool (5) @ Intake Camshaft - Install

  35. GM5372539Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The EN-52457  Camshaft Locking Tool has an identification for which side of the tool must be facing upward. Place the EN-52457  Camshaft Locking Tool with the I (1) facing upwards. The surface of the tool will also have the identification exhaust (2) for use on the exhaust camshaft.

    EN-52457-2  locking tool (5) - Install

  36. If the EN-52457  Camshaft Locking Tool can be installed, the engine timing is properly adjusted.
  37. If the EN-52457  Camshaft Locking Tool can not be installed, repeat the steps to set the engine timing.
  38. EN-52457  Camshaft Locking Tool - Remove
  39. GM5274430Courtesy of GENERAL MOTORS COMPANY

    Crankshaft Balancer Bolt (1) - Remove

  40. GM5274424Courtesy of GENERAL MOTORS COMPANY

    Bolt (2) - Remove [2x]

  41. EN-52476  Flywheel Locking Tool (1) - Remove
  42. Timing Chain Lower Cover - Install - Timing Belt Lower Cover Replacement 
  43. Starter - Install - Starter Replacement (LIH)
  44. Camshaft Position Actuator Solenoid Valve - Exhaust - Install - Camshaft Position Actuator Solenoid Valve Replacement - Exhaust
  45. Camshaft Position Actuator Solenoid Valve - Intake - Install - Camshaft Position Actuator Solenoid Valve Replacement - Intake
  46. Camshaft Cover - Install - Camshaft Cover Replacement 
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