Canyon, Colorado 2004-2005

Camshaft, Bearings & Lifters

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Inspection



  1. Clean the camshafts with cleaning solvent.
  2.  
  3. Inspect the camshafts for scored journals, damaged lobes, damaged sprocket locator slots and damaged threads.
  4.  
  5. Measure the camshaft lobes using a micrometer. The intake camshaft lobes should be a minimum of 1.635 in. (41.5 mm). The exhaust camshaft lobes should be a minimum of 1.615 in. (41 mm).
  6.  
  7. Clean the valve rocker arms and valve lash adjusters in cleaning solvent.
  8.  
  9. Dry the valve rocker arms and valve lash adjusters with compressed air.
  10.  
  11. Inspect the valve rocker arms for the following conditions:
  12.  
  13. Excessive wear at the valve contact or lash adjuster socket area.
  14.  
  15. A loose or damaged pin.
  16.  
  17. A worn or damaged roller. The roller should rotate freely with no binding or roughness.
  18.  
  19. Inspect the valve lash adjusters for excessive wear, clogged oil passages, damage or collapsing or sponginess.
  20.  

  1. Clean the camshafts with cleaning solvent.
  2.  
  3. Inspect the camshafts for scored journals, damaged lobes, damaged sprocket locator slots and damaged threads.
  4.  
  5. Measure the camshaft lobes using a micrometer. The intake camshaft lobes should be a minimum of 1.635 in. (41.5 mm). The exhaust camshaft lobes should be a minimum of 1.615 in. (41 mm).
  6.  
  7. Clean the valve rocker arms and valve lash adjusters in cleaning solvent.
  8.  
  9. Dry the valve rocker arms and valve lash adjusters with compressed air.
  10.  
  11. Inspect the valve rocker arms for the following conditions:
  12.  
  13. Excessive wear at the valve contact or lash adjuster socket area.
  14.  
  15. A loose or damaged pin.
  16.  
  17. A worn or damaged roller. The roller should rotate freely with no binding or roughness.
  18.  
  19. Inspect the valve lash adjusters for excessive wear, clogged oil passages, damage or collapsing or sponginess.
  20.  

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Properly relieve the fuel system pressure.
  4.  
  5. Disconnect the negative battery cable.
  6.  
  7. Drain the engine cooling system and the engine oil.
  8.  
  9. Remove or disconnect the following:

    Intake manifold
     
    Ignition coils
     
    Coolant temperature sensor connector
     
    Injector harness connector
     
    Ignition coil connectors
     
    Oxygen Sensor (O 2 S) connector
     
    Fuel pressure regulator screw
     
    Camshaft cover
     
    Both Camshaft Position (CMP) sensors
     

  10.  
  11. Rotate the crankshaft clockwise until the no. 1 cylinder is at TDC on the compression stroke. The word DELPHI on the camshaft position actuator will be parallel with the cylinder head surface.
  12.  
  13. Install camshaft locking tool J-44221 to the rear of the camshafts.

    Click image to see an enlarged view

    Fig. Install the camshaft locking tool J-44221 to the rear of the camshafts.

  14.  
  15. Remove the camshaft sprocket bolts and discard them.
  16.  
  17. Install tension tool J-44222 on the cylinder head and install the holding bolts in the camshaft sprocket bolt holes to lock the timing chain and sprockets in position.

    Click image to see an enlarged view

    Fig. Use Special Tool J-44222 camshaft sprocket holding tool to prevent the timing chain and sprockets from turning.

  18.  
  19. Carefully slide the sprockets and timing chain onto the tension tool.
  20.  
  21. Remove the camshaft bearing caps.
  22.  
  23. Remove the Camshaft Locking Tool from the camshafts.
  24.  
  25. Remove the camshafts.
  26.  
  27. Remove the valve rocker arms.
  28.  
  29. Remove the valve lash adjusters.
  30.  
  31. Clean and inspect the valve rocker arms and valve lash adjusters.
  32.  

To install:

  1. Lubricate and fill the valve lash adjusters with engine oil.
  2.  
  3. Install the valve lash adjusters in their original locations.
  4.  
  5. Lubricate the entire valve rocker arm.
  6.  
  7. Install the valve rocker arms in their original locations.
  8.  
  9. Inspect the camshaft, journals and lobes for wear and replace, if necessary.
  10.  
  11. If removed, use the camshaft bearing tool to install a new set of bearings.
  12.  
  13. Coat the camshaft lobes, journals and thrust face with clean engine oil.
  14.  
  15. Install camshaft locking tool J-44221 to the rear of the camshafts.
  16.  
  17. Install the camshafts with the flats up and with cylinder no. 1 at TDC.
  18.  
  19. Install the bearing caps in their original position and tighten the bolts to 106 inch lbs. (12 Nm).
  20.  
  21. Carefully slide the sprockets and timing chain onto the camshafts, ensuring the alignment pins are engaged between the camshafts and sprockets.
  22.  
  23. Install new camshaft sprocket bolts and washers. Tighten the intake sprocket bolt to 15 ft. lbs. (20 Nm), plus it additional 100°. Tighten the exhaust sprocket bolt to 18 ft. lbs. (25 Nm), plus an additional 135°.
  24.  
  25. Remove the camshaft locking plate tool.
  26.  
  27. Install or connect the following:

    Both Camshaft Position (CMP) sensors
     
    Camshaft cover
     
    Fuel pressure regulator screw
     
    Oxygen Sensor (O 2 S) connector
     
    Ignition coil connectors
     
    Injector harness connector
     
    Coolant temperature sensor connector
     
    Ignition coils
     
    Intake manifold
     
    Negative battery cable
     

  28.  
  29. Refill the engine cooling system and engine oil.
  30.  

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Properly relieve the fuel system pressure.
  4.  
  5. Disconnect the negative battery cable.
  6.  
  7. Drain the engine cooling system and the engine oil.
  8.  
  9. Remove or disconnect the following:

    Intake manifold
     
    Ignition coils
     
    Coolant temperature sensor connector
     
    Injector harness connector
     
    Ignition coil connectors
     
    Oxygen Sensor (O 2 S) connector
     
    Fuel pressure regulator screw
     
    Camshaft cover
     
    Both Camshaft Position (CMP) sensors
     

  10.  
  11. Rotate the crankshaft clockwise until the no. 1 cylinder is at TDC on the compression stroke. The word DELPHI on the camshaft position actuator will be parallel with the cylinder head surface.
  12.  
  13. Install camshaft locking tool J-44221 to the rear of the camshafts.

    Click image to see an enlarged view

    Fig. Install the camshaft locking tool J-44221 to the rear of the camshafts.

  14.  
  15. Remove the camshaft sprocket bolts and discard them.
  16.  
  17. Install tension tool J-44222 on the cylinder head and install the holding bolts in the camshaft sprocket bolt holes to lock the timing chain and sprockets in position.

    Click image to see an enlarged view

    Fig. Use Special Tool J-44222 camshaft sprocket holding tool to prevent the timing chain and sprockets from turning.

  18.  
  19. Carefully slide the sprockets and timing chain onto the tension tool.
  20.  
  21. Remove the camshaft bearing caps.
  22.  
  23. Remove the Camshaft Locking Tool from the camshafts.
  24.  
  25. Remove the camshafts.
  26.  
  27. Remove the valve rocker arms.
  28.  
  29. Remove the valve lash adjusters.
  30.  
  31. Clean and inspect the valve rocker arms and valve lash adjusters.
  32.  

To install:

  1. Lubricate and fill the valve lash adjusters with engine oil.
  2.  
  3. Install the valve lash adjusters in their original locations.
  4.  
  5. Lubricate the entire valve rocker arm.
  6.  
  7. Install the valve rocker arms in their original locations.
  8.  
  9. Inspect the camshaft, journals and lobes for wear and replace, if necessary.
  10.  
  11. If removed, use the camshaft bearing tool to install a new set of bearings.
  12.  
  13. Coat the camshaft lobes, journals and thrust face with clean engine oil.
  14.  
  15. Install camshaft locking tool J-44221 to the rear of the camshafts.
  16.  
  17. Install the camshafts with the flats up and with cylinder no. 1 at TDC.
  18.  
  19. Install the bearing caps in their original position and tighten the bolts to 106 inch lbs. (12 Nm).
  20.  
  21. Carefully slide the sprockets and timing chain onto the camshafts, ensuring the alignment pins are engaged between the camshafts and sprockets.
  22.  
  23. Install new camshaft sprocket bolts and washers. Tighten the intake sprocket bolt to 15 ft. lbs. (20 Nm), plus it additional 100°. Tighten the exhaust sprocket bolt to 18 ft. lbs. (25 Nm), plus an additional 135°.
  24.  
  25. Remove the camshaft locking plate tool.
  26.  
  27. Install or connect the following:

    Both Camshaft Position (CMP) sensors
     
    Camshaft cover
     
    Fuel pressure regulator screw
     
    Oxygen Sensor (O 2 S) connector
     
    Ignition coil connectors
     
    Injector harness connector
     
    Coolant temperature sensor connector
     
    Ignition coils
     
    Intake manifold
     
    Negative battery cable
     

  28.  
  29. Refill the engine cooling system and engine oil.
  30.  

 
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