H3 2006

Camshaft & Lifters

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Inspection



3.5L Engine

Specific to:

Hummer H3 2006-2010

  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 inches (41.5 mm). The exhaust camshaft lobes should be a minimum of 1.615 inches (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.  

3.7L Engine

Specific to:

Hummer H3 2006-2010

  1. Clean the camshafts with cleaning solvent.
  2.  
  3. Inspect the camshafts for the following conditions:

    Scored camshaft journals
     
    Damaged camshaft lobes
     
    Damaged camshaft sprocket locator pin and slots
     
    Damaged threads
     

  4.  
  5. Measure the camshaft lobes using a micrometer. The intake camshaft lobes should be a minimum of 1.635 inches (41.5 mm). The exhaust camshaft lobes should be a minimum of 1.615 inches (41 mm).
  6.  
  7. Use J 7872 to measure the camshaft runout:
    1. Set the camshaft in V-blocks between the centers.
    2.  
    3. Measure the intermediate camshaft journal.
    4.  

  8.  
  9. Use J 7872 to measure the camshaft lobe lift.
    1. Lubricate the camshaft to V-block contact areas with engine oil.
    2.  
    3. Set the camshaft on V-blocks.
    4.  
    5. Measure the camshaft lobe lift.
    6.  

  10.  
  11. If the runout or camshaft lobe lift is not within specifications, replace the camshaft.

    Click image to see an enlarged view

    Fig. Camshaft inspection-3.7L engine

  12.  

5.3L Engine

Specific to:

Hummer H3 2006-2010

  1. Clean the components in solvent.
  2.  
  3. Dry the components with compressed air.
    CAUTION
    Wear safety glasses when using compressed air in order to prevent eye injury.

  4.  
  5. Inspect the camshaft bearing journals (1) for scoring or excessive wear.
  6.  
  7. Inspect the camshaft valve lifter lobes (2) for scoring or excessive wear.
  8.  
  9. Inspect the threaded bolt hole (3) in the front of the camshaft for damaged threads or debris.
  10.  
  11. Inspect the camshaft sprocket pin (204) for damage.

    Click image to see an enlarged view

    Fig. Camshaft journal and lobe inspection-5.3L engine

  12.  
  13. Inspect the camshaft retainer plate for wear or a damaged sealing gasket. If the camshaft retainer plate sealing gasket is not cut or damaged, it may be used again.
  14.  
  15. Inspect the camshaft bearings for the following:

    Excessive wear or scoring. The presence of the copper color bearing material should be considered normal and not a guideline for bearing replacement. Measure the bearing Inside Diameter (ID) as required for an over-sized condition.
     
    Proper fit in the engine block. Camshaft bearings have an interference fit to the engine block and should not be loose in the engine block bearing bores.
     
    Oil lubrication hole plugged by debris. Bearings with excessive wear or scoring must be replaced.
     

  16.  
  17. Using a micrometer, measure the camshaft journals for wear and out-of-round:
    1. If the camshaft bearing journals are greater than 0.001 inches (0.025 mm) out-of-round, replace the camshaft.
    2.  
    3. If the camshaft bearing journal diameter is less than 2.164 inches (54.99 mm), replace the camshaft.
    4.  

  18.  
  19. Using a micrometer, measure the camshaft lobes for wear.
  20.  
  21. Measure the camshaft runout:
    1. Mount the camshaft in wooden V-blocks or between centers on a fixture.
    2.  
    3. Using the J 7872 set, measure the runout of the intermediate camshaft bearing journals.
    4.  
    5. If camshaft runout exceeds 0.002 inches (0.05 mm), the camshaft is bent and should be replaced.

      Click image to see an enlarged view

      Fig. Camshaft runout measurement-5.3L engine

    6.  

  22.  
  23. Measure camshaft lobe lift, using the J8520 indicator:
    NOTE
    Measuring camshaft lobe lift is a procedure used to determine if the camshaft lobes have worn. This test is to be performed prior to engine disassembly and with the camshaft and valve train components installed in the engine.

    1. Remove the valve rocker arms and bolts.
    2.  
    3. Install the dial indicator mounting stud into the valve rocker arm bolt hole.
    4.  
    5. Assemble the components of the J 8520 indicator and position onto the stud.
    6.  
    7. Position the shaft of the dial indicator onto the end of the pushrod.
    8.  
    9. Rotate the face of the dial indicator to zero.
    10.  
    11. Slowly rotate the crankshaft clockwise, until the dial indicator obtains its highest and lowest readings.
    12.  
    13. Compare the total to specifications.

      Click image to see an enlarged view

      Fig. Camshaft lobe lift measurement

    14.  

  24.  

Removal & Installation



3.5L Engine

Specific to:

Hummer H3 2006-2010

  1. Properly relieve the fuel system pressure.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Drain the engine cooling system and the engine oil.
  6.  
  7. 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
     

  8.  
  9. 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.
  10.  
  11. 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.

  12.  
  13. Remove the camshaft sprocket bolts and discard them.
  14.  
  15. 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.

  16.  
  17. Carefully slide the sprockets and timing chain onto the tension tool.
  18.  
  19. Remove the camshaft bearing caps.
  20.  
  21. Remove the Camshaft Locking Tool from the camshafts.
  22.  
  23. Remove the camshafts.
  24.  
  25. Remove the valve rocker arms.
  26.  
  27. Remove the valve lash adjusters.
  28.  
  29. Clean and inspect the valve rocker arms and valve lash adjusters.
  30.  

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.  

3.7L Engine

Specific to:

Hummer H3 2006-2010

  1. Remove the camshaft cover, as follows:
    1. Remove the intake manifold.
    2.  
    3. Remove the ignition coils.
    4.  
    5. Remove the following electrical connectors from the camshaft cover:

      The fuel injector
       
      The Heated Oxygen sensor (HO2S)
       
      The Engine Coolant Temperature (ECT) sensor

      Click image to see an enlarged view

      Fig. Remove sensor connectors

       

    6.  
    7. Remove the camshaft cover ground wire bolt from the cover.
    8.  
    9. Remove the ground wire from cover.

      Click image to see an enlarged view

      Fig. Remove the ground wire

    10.  
    11. Remove the camshaft cover bolts.
    12.  
    13. Remove the camshaft cover from the cylinder head.

      Click image to see an enlarged view

      Fig. Camshaft cover

    14.  
    15. Remove the seals from the camshaft cover.
    16.  
    17. Do not reuse the seals.
    18.  
    19. Clean and inspect the cylinder head sealing surface.
    20.  

  2.  
  3. Remove the Camshaft Position (CMP) sensor.
  4.  
  5. Rotate the crankshaft in the engine rotational direction clockwise, until the No. 1 piston is at top dead center (TDC) on the compression stroke.
    CAUTION
    The camshaft holding tools must be installed on the camshafts to prevent camshaft rotation. When performing service to the valve train and/or timing components, valve spring pressure can cause the camshafts to rotate unexpectedly and can cause personal injury.

  6.  
  7. Install the J 44221 to the rear of the camshafts.
  8.  
  9. Remove and discard the intake and the exhaust camshaft sprocket bolts.
    WARNING
    In order to maintain timing chain tension, make sure the 2 bolts that hold J 44222 to the front of the cylinder head are completely tightened and the horizontal bolt into the exhaust camshaft phaser actuator sprocket is adjusted correctly before sliding the sprockets off the camshafts. Failure to do so may disturb the timing chain components.



    Click image to see an enlarged view

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

  10.  
  11. Install the J 44222 onto the cylinder head and adjust the horizontal bolts into the camshaft sprockets in order to maintain chain tension and keep from disturbing the timing chain components.
  12.  
  13. Carefully slide the sprockets with the timing chain from the camshafts to the J 44222.

    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.

  14.  
  15. Alternately loosen the camshaft cap bolts a few turns at a time until all valve spring pressure has been released.
    NOTE
    Place the camshaft caps in a rack to ensure the caps are installed in the same location from which they were removed.

  16.  
  17. Remove the camshaft caps.

    Click image to see an enlarged view

    Fig. Remove the camshaft caps

  18.  
  19. Remove the J 44221 from the camshafts.
  20.  
  21. Remove the camshafts from the cylinder head.

    Click image to see an enlarged view

    Fig. Remove the camshaft

  22.  

To install:

  1. Coat the camshaft journals, camshaft journal thrust face, and camshaft lobes with clean engine oil.
  2.  
  3. Install the J 44221 with the camshaft flats up and the No. 1 piston at TDC.
  4.  
  5. Install the intake and exhaust camshafts to their original positions.
  6.  
  7. Observe the markings on the camshaft caps. Each camshaft cap is marked in order to identify its location. The markings have the following meanings:

    The arrow should point to the front of the engine.
     
    The number indicates the position from the front of the engine.
     
    The "E" indicates the exhaust camshaft.
     
    The "I" indicates the intake camshaft.
     

  8.  
  9. Install the camshaft caps according to the identification marks.

    Click image to see an enlarged view

    Fig. Camshaft cap identification marks

  10.  
  11. Install the camshaft cap bolts. Tighten the bolts evenly in order to compress the valve springs before final torque. Tighten the bolts to 106 inch lbs. (12 Nm).
    NOTE
    To aid in aligning the sprockets to the camshafts, use a 1 inches (25 mm) wrench on the hex of the camshafts to rotate.


    NOTE
    Ensure the alignment pins are properly engaged with the camshafts.

  12.  
  13. Carefully slide the sprockets with the timing chain from the J 44222 to the camshafts.
  14.  
  15. Remove the J 44222 from the cylinder head.
  16.  
  17. Install the new intake camshaft sprocket bolt. Tighten the intake camshaft sprocket bolt to 15 ft. lbs. (20 Nm) plus an additional 100 degrees using the J 45059.
  18.  
  19. Install the new exhaust camshaft actuator bolt. Tighten the exhaust camshaft actuator bolt to 18 ft. lbs. (25 Nm) plus an additional 135 degrees using the J 45059.
  20.  
  21. Remove the J 44221 from the camshafts.
  22.  
  23. Install the CMP sensor.
  24.  
  25. Install the camshaft cover, as follows:
    1. Install a NEW camshaft cover seal into the camshaft cover groove.
    2.  
    3. Install NEW ignition coil seals into the camshaft cover grooves.
    4.  
    5. Place the camshaft cover onto the cylinder head.
    6.  
    7. Install the camshaft cover bolts and tighten to 89 inch lbs. (10 Nm).
    8.  
    9. Position the ground wire to the camshaft cover. Ensure that the anti rotation tab is seated against the cover.
    10.  
    11. Install the camshaft cover ground wire bolt to the cover and tighten to 89 inch lbs. (10 Nm).
    12.  
    13. Install the following electrical connectors to the camshaft cover:

      The fuel injector
       
      The HO2S
       
      The ECT sensor
       

    14.  
    15. Install the ignition coils.
    16.  
    17. Install the intake manifold.
    18.  

  26.  

5.3L Engine

Specific to:

Hummer H3 2006-2010

  1. Remove the condenser.
  2.  
  3. Remove the engine front cover.
  4.  
  5. Remove all of the valve lifters, as follows:
    1. Remove the cylinder head and gasket.
    2.  
    3. Remove the guide bolts.
    4.  
    5. Remove the guides with lifters.
      NOTE
      Note the installed position of the guides. The notched area of the guide is to align with the locating tab on the block.



      Click image to see an enlarged view

      Fig. Remove the guide bolts (211), and the guides (210) with lifters

    6.  
    7. Remove the valve lifters from the guide.

      Click image to see an enlarged view

      Fig. Remove the valve lifters (209) from the guide (210)

    8.  
    9. Organize or mark the components so they can be installed in the same location from which they were removed.
    10.  
    11. Clean and inspect the valve lifters.
    12.  

  6.  
  7. Remove the camshaft sensor bolt and sensor.
  8.  
  9. Rotate the crankshaft until the timing marks on the crankshaft and camshaft sprockets are aligned.

    Click image to see an enlarged view

    Fig. Rotate the crankshaft until the timing marks on the crankshaft and camshaft sprockets are aligned

  10.  
  11. Remove the camshaft sprocket bolt.

    Click image to see an enlarged view

    Fig. Remove the camshaft sprocket bolt (206)

  12.  
  13. Remove the bolts (231) and timing chain tensioner (232).

    Click image to see an enlarged view

    Fig. Remove the bolts (231) and timing chain tensioner (232)

  14.  
  15. Remove the camshaft sprocket and reposition the timing chain.
  16.  
  17. Remove the camshaft retainer bolts (204) and retainer (203).
    WARNING
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.



    Click image to see an enlarged view

    Fig. Remove the camshaft retainer bolts (204) and retainer (203)

  18.  
  19. Install a bolt into the camshaft.
  20.  
  21. Using the bolt as a handle, carefully rotate and pull the camshaft out of the engine block.
  22.  
  23. Clean and inspect the camshaft and bearings.

    Click image to see an enlarged view

    Fig. Remove camshaft

  24.  

To install:


NOTE
If camshaft replacement is required, the valve lifters must also be replaced.

  1. Lubricate the camshaft journals and the bearings with clean engine oil.
    WARNING
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.

  2.  
  3. Using the bolt as a handle, carefully install the camshaft into the engine block.
  4.  
  5. Remove the bolt from the front of the camshaft.
    NOTE
    Install the retainer with the sealing gasket facing the engine block.


    NOTE
    The gasket surface on the engine block should be clean and free of dirt and/or debris.

  6.  
  7. Install the camshaft retainer and bolts.
  8.  
  9. Tighten the camshaft retainer bolts:

    Tighten the first design hex head bolts to 18 ft. lbs. (25 Nm).
     
    Tighten the second design TORX® head bolts to 11 ft. lbs. (15 Nm).
     

  10.  
  11. Compress the timing chain tensioner guide and install the EN 46330.
  12.  
  13. Install the timing chain tensioner and bolts. Tighten the timing chain tensioner bolts to 18 ft. lbs. (25 Nm).
    WARNING
    Properly locate the camshaft sprocket locating pin with the camshaft sprocket alignment hole. The sprocket teeth and timing chain must mesh. The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly. Locate the camshaft sprocket alignment mark (1) in the 6 o'clock position and the crankshaft sprocket (2) should be located in the 12 o'clock position.



    Click image to see an enlarged view

    Fig. Camshaft and the crankshaft sprocket alignment marks

  14.  
  15. If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks.
  16.  
  17. Install the camshaft sprocket and the timing chain.
  18.  
  19. Install a NEW camshaft sprocket bolt.
  20.  
  21. Tighten the camshaft sprocket bolt:

    Tighten the camshaft sprocket bolt a first pass to 55 ft. lbs. (75 Nm).
     
    Tighten the camshaft sprocket bolt a final pass, an additional 50 degrees using the J 45059.
     

  22.  
  23. Remove the EN 46330.
  24.  
  25. Inspect the camshaft sensor O-ring seal. If the O-ring seal is not cut or damaged, it may be reused.
  26.  
  27. Lubricate the O-ring seal with clean engine oil.
  28.  
  29. Install the camshaft sensor and bolt. Tighten the bolt to 18 ft. lbs. (25 Nm).
  30.  
  31. Install the valve lifters, as follows:
    NOTE
    When using the valve lifters again, install the lifters to their original locations.


    NOTE
    If camshaft replacement is required, the valve lifters must also be replaced.

    1. Lubricate the valve lifters and engine block valve lifter bores with clean engine oil.
    2.  
    3. Insert the valve lifters into the lifter guides. Align the flat area on the top of the lifter with the flat area in the lifter guide bore. Push the lifter completely into the guide bore.
    4.  
    5. Install the valve lifters and guide assembly to the engine block.
    6.  
    7. Install the valve lifter guide bolts and tighten to 106 inch lbs. (12 Nm).
    8.  

  32.  
  33. Install the cylinder head and gasket.
  34.  
  35. Install the engine front cover.
  36.  
  37. Install the condenser.
  38.  

 
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