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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Mechanical - 1.8L (Lay)) >> Repair Instructions - Off Vehicle >> Camshaft Timing Chain and Sprocket Cleaning and Inspection

Camshaft Timing Chain and Sprocket Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.
  1. Install the camshaft timing gear.
  2. Check the lock of the camshaft timing gear and confirm it is locked.
    3. Fig 1: Locating Lock Pin
    GM2017086Courtesy of GENERAL MOTORS CORP.
  3. Release the lock pin.
    4. NOTE: There are 4 oil paths in the groove of the camshaft. Plug three of the paths with pieces of rubber.
  4. Cover the 4 oil paths of the cam journal with vinyl tape as shown in the illustration.
  5. Prick a hole in the tape placed on the advance side path. Prick a hole in the tape placed on the retard side path, on the opposite side to that of the advance side path, as shown in the illustration.
    6. Fig 2: Applying Air Pressure To Clean Sprocket
    GM2017087Courtesy of GENERAL MOTORS CORP.
    NOTE:
    • Cover the paths with a piece of cloth when applying pressure to keep oil from splashing.
    • Do not lock the camshaft timing gear assembly. If it is locked, release the lock pin again.
    • The camshaft timing gear assembly may be turned in the advance direction without applying any force.
    • If enough air pressure cannot be applied because of air leakage from the port, releasing the lock pin may be difficult.
  6. While applying approximately 150 kPa (22 psi) of air pressure to the oil paths, forcibly turn the camshaft timing gear assembly in the advance direction (counterclockwise).
    7. NOTE: Do not lock the camshaft timing gear assembly. If it is locked, release the lock pin again.
  7. Turn the camshaft timing gear within its movable range (26.5-28.5 degrees) 2 or 3 times, but do not turn it to the most retarded position. Make sure that the gear turns smoothly.
  8. Inspect the camshaft timing exhaust gear assembly.
  9. Install the camshaft timing gear.
  10. Make sure that the camshaft timing exhaust gear is locked.
    11. Fig 3: Identifying Lock Pin
    GM2017088Courtesy of GENERAL MOTORS CORP.
  11. Release the lock pin.
    12. NOTE: The 4 oil paths are provided in the grooves. Plug 2 paths with rubber pieces.
  12. Cover the 4 oil paths of the cam journal with vinyl tape as shown in the illustration.
  13. Prick a hole in the tape placed on the advance side path. Prick a hole in the tape placed on the retard side path, on the opposite side to that of the advance side path, as shown in the illustration.
    14. Fig 4: View Of Sprocket Assembly Cleaning With Compressed Air
    GM2017089Courtesy of GENERAL MOTORS CORP.
    NOTE: Cover the paths with a piece of cloth when applying pressure to keep oil from splashing.
  14. Apply approximately 200 kPa (28 psi) of air pressure to the 2 paths (the advance side path and the retard side path).
    15. Fig 5: Ensuring Camshaft Timing Exhaust Gear Turns In Retard Direction
    GM2017090Courtesy of GENERAL MOTORS CORP.
    NOTE: The lock pin is released and the camshaft timing exhaust gear turns in the retard direction.
  15. Make sure that the camshaft timing exhaust gear turns in the retard direction when reducing the air pressure applied to the advance side path.
    16. NOTE: Be sure to release the air pressure from the advance side path first. If the air pressure of the retard side path is released first, the camshaft timing exhaust gear may abruptly shift in the advance direction and break the lock pin or other parts.
  16. When the camshaft timing exhaust gear moves to the most retarded position, release the air pressure from the advance side path, and then release the air pressure from the retard side path.
    17. NOTE: When the air pressure is released from the advance side path and then from the retard side path, the gear automatically returns to the most advanced position due to the advance assist spring operation and locks. Gradually release the air pressure from the retard side path before performing the smooth rotation check.
  17. Turn the camshaft timing exhaust gear within its movable range (19-21 degrees) 2 or 3 times, but do not turn it to the most advanced position. Make sure that the gear turns smoothly.
  18. Make sure that the camshaft timing exhaust gear is locked at the most advanced position.
    19. Fig 6: Checking Maximum Chain Elongation
    GM2017091Courtesy of GENERAL MOTORS CORP.
  19. Pull the chain with a force of 147 N (33 lb ft) as shown in the illustration.
    20. NOTE: Perform the measurement at 3 random places. Use the average of the measurements. If the average elongation is greater than the maximum, replace the chain.
  20. Using vernier calipers, measure the length of 15 links.

    Specification:  Maximum Chain Elongation - 115.2 mm (4.535 in).

    21. Fig 7: Inspecting Camshaft Timing Gear Assembly
    GM2017098Courtesy of GENERAL MOTORS CORP.
  21. Inspect the camshaft timing gear assembly.
  22. Place the chain around the gear.
    23. NOTE: The vernier calipers must be in contact with the chain rollers when measuring.
  23. Using vernier calipers, measure the diameter of the gear and chain.

    If the diameter is less than the minimum, replace the chain and gear.

    Specification:  Minimum gear diameter (with chain) - 96.8 mm (3.811 in).

    24. Fig 8: Measuring Diameter Of Sprocket & Chain
    GM2017099Courtesy of GENERAL MOTORS CORP.
  24. Inspect camshaft timing exhaust gear assembly
  25. Place the chain around the sprocket.
    26. NOTE: The vernier calipers must be in contact with the chain rollers when measuring.
  26. Using vernier calipers, measure the diameter of the sprocket and chain.

    If the diameter is less than the minimum, replace the chain and sprocket.

    Specification:  Minimum sprocket diameter (with chain) - 96.8 mm (3.811 in).

    27. Fig 9: Inspecting Oil Pump Drive Gear
    GM2017094Courtesy of GENERAL MOTORS CORP.
  27. Inspect crankshaft timing gear.
  28. Place the chain around the gear.
    29. NOTE: The vernier calipers must be in contact with the chain rollers when measuring.
  29. Using vernier calipers, measure the diameter of the gear and chain.

    If the diameter is less than the minimum, replace the chain and gear.

    Specification:  Minimum gear diameter (with chain) - 51.1 mm (2.012 in).

    30. Fig 10: View Of Tensioner Slipper
    GM2017101Courtesy of GENERAL MOTORS CORP.
  30. Inspect chain tensioner slipper.
  31. Using vernier calipers, measure the tensioner slipper wear.

    If the wear is greater than the maximum, replace the chain tensioner slipper.

    Specification:  Maximum wear - 1.0 mm (0.039 in).

    32. Fig 11: View Of Chain Vibration Damper
    GM2017102Courtesy of GENERAL MOTORS CORP.
  32. Inspect No. 1 chain vibration damper.
  33. Using vernier calipers, measure the vibration damper wear.

    If the wear is greater than the maximum, replace the No. 1 chain vibration damper.

    Specification:  Maximum wear - 1.0 mm (0.039 in).

    34. Fig 12: View Of Chain Vibration Damper
    GM2017103Courtesy of GENERAL MOTORS CORP.
  34. Inspect No. 2 chain vibration damper.
  35. Using vernier calipers, measure the vibration damper wear.

    If the wear is greater than the maximum, replace the No. 2 chain vibration damper.

    Specification:  Maximum wear - 1.0 mm (0.039 in).

    36. Fig 13: Inspecting Chain Tensioner Plate
    GM2017104Courtesy of GENERAL MOTORS CORP.
  36. Inspect chain tensioner plate.
  37. Using vernier calipers, measure the chain tensioner plate wear.

    If the wear is greater than the maximum, replace the chain tensioner plate.

    Specification:  Maximum wear - 1.0 mm (0.039 in).

    38. Fig 14: Inspecting Chain Tensioner Assembly
    GM2017107Courtesy of GENERAL MOTORS CORP.
  38. Inspect No. 1 chain tensioner.
  39. Check that the plunger moves smoothly when the ratchet pawl is raised with your finger.
  40. Release the ratchet pawl, then check that the plunger is locked in place by the ratchet pawl and does not move when pushed with your finger.
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