H3 2006

Timing Chain & Sprockets

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Removal & Installation



3.5L & 3.7L Engines

Specific to:

Hummer H3 2006-2010

  1. Remove No. 1 cylinder spark plug.
  2.  
  3. Remove the camshaft cover.
  4.  
  5. Remove the exhaust Camshaft Position (CMP) sensor.
  6.  
  7. Remove the intake CMP sensor.
  8.  
  9. Remove the engine front cover.
  10.  
  11. Rotate the crankshaft in the engine rotational direction clockwise, until the No. 1 piston is at top dead center (TDC) on the compression stroke.
  12.  
  13. Install the J 44221 to the rear of the camshafts.

    Click image to see an enlarged view

    Fig. Install the J 44221 to the rear of the camshafts

  14.  
  15. Release the tension on the timing chain by moving the tensioner shoe in.
  16.  
  17. Place the tee into the tensioner to hold the shoe in place.

    Click image to see an enlarged view

    Fig. Place the tee into the tensioner to hold the shoe in place

  18.  
  19. Remove and discard the exhaust camshaft position actuator bolt.
  20.  
  21. Remove the exhaust camshaft position actuator.

    Click image to see an enlarged view

    Fig. Remove the exhaust camshaft position actuator

  22.  
  23. Remove and discard the intake camshaft sprocket bolt.
  24.  
  25. Remove the intake camshaft sprocket.
  26.  
  27. Remove the timing chain.
  28.  
  29. Remove the crankshaft sprocket.

    Click image to see an enlarged view

    Fig. Remove the intake camshaft timing chain and sprocket

  30.  

To install:


NOTE
Ensure the No. 1 piston is at TDC. The pin on the crankshaft for the timing chain sprocket should be straight up.

  1. Install the crankshaft sprocket to the crankshaft snout.
    NOTE
    Every 7th link of the timing chain is darkened to aid in aligning the timing marks.

  2.  
  3. Install the intake camshaft sprocket into the timing chain.
  4.  
  5. Align the dark link of the timing chain with the timing mark on the intake camshaft sprocket.
  6.  
  7. Feed the timing chain down through the opening in the cylinder head.
  8.  
  9. Install the timing chain on the crankshaft sprocket.
  10.  
  11. Align the dark link of the timing chain with the timing mark on to the crankshaft sprocket.
    NOTE
    Ensure the alignment pin is properly engaged with the camshaft

  12.  
  13. Install the intake camshaft sprocket onto the intake camshaft.
  14.  
  15. Install the new intake camshaft sprocket bolt and tighten to 15 ft. lbs. (20 Nm) plus an additional 100 degrees using the J 45059.

    Click image to see an enlarged view

    Fig. Install the new intake camshaft sprocket bolt

  16.  
  17. Ensure the camshaft actuator is fully advanced prior to installation.
  18.  
  19. Install the exhaust camshaft actuator into the timing chain. Align the dark link of the timing chain with the timing mark on the exhaust camshaft position actuator sprocket.
    NOTE
    To aid in aligning the actuator to the camshaft, use a 1 inches (25 mm) wrench on the hex of the camshaft to rotate. Ensure the alignment pin is properly engaged with the camshaft.



    Click image to see an enlarged view

    Fig. Align the dark link (1) of the timing chain with the timing mark (1) on the exhaust camshaft position actuator sprocket

  20.  
  21. Install the exhaust camshaft actuator onto the exhaust camshaft.
  22.  
  23. Install the new exhaust camshaft actuator bolt and tighten to 18 ft. lbs. (25 Nm) plus an additional 135 degrees using the J 45059.
  24.  
  25. Remove the tee in the timing chain tensioner to regain tension on the timing chain.
  26.  
  27. Remove the J 44221 from the camshafts.
  28.  
  29. The dark links on the timing chain should be aligned with the marks on the sprockets as shown.

    Click image to see an enlarged view

    Fig. The dark links (1) on the timing chain should be aligned with the marks on the sprockets

  30.  
  31. Install the engine front cover.
  32.  
  33. Install the intake CMP sensor.
  34.  
  35. Install the exhaust CMP sensor.
  36.  
  37. Install the camshaft cover.
  38.  
  39. Install No. 1 cylinder spark plug.
  40.  

5.3L Engine

Specific to:

Hummer H3 2006-2010

  1. Remove the oil pump.
    WARNING
    Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves.

  2.  
  3. Rotate the crankshaft until the timing marks on the crankshaft and the camshaft sprockets are aligned.
    WARNING
    Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves.

  4.  
  5. Remove and discard the camshaft sprocket bolt.
  6.  
  7. Remove the camshaft sprocket and timing chain.

    Click image to see an enlarged view

    Fig. Remove camshaft sprocket (205), bolt (206), and timing chain (208)

  8.  
  9. Remove the bolts and timing chain tensioner.

    Click image to see an enlarged view

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

  10.  
  11. Use the J 41816-2, the J 41558, bolts, and the J 8433 in order to remove the crankshaft sprocket.

    Click image to see an enlarged view

    Fig. Use the J 41816-2 (1), the J 41558 (2), bolts (3), and the J 8433 (4)

  12.  
  13. Remove the crankshaft sprocket.

    Click image to see an enlarged view

    Fig. Remove crankshaft sprocket (207)

  14.  
  15. Remove the crankshaft sprocket key, as required.
  16.  

To install:

  1. Install the key into the crankshaft keyway, if previously removed.
  2.  
  3. Tap the key into the keyway until both ends of the key bottom onto the crankshaft.
  4.  
  5. Install the crankshaft sprocket onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.
  6.  
  7. Use the J 41478 and the J 41665 in order to install the crankshaft sprocket. Install the sprocket onto the crankshaft until fully seated against the crankshaft flange.

    Click image to see an enlarged view

    Fig. Use the J 41478 (1) and the J 41665 (2) in order to install the crankshaft sprocket

  8.  
  9. Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.
  10.  
  11. Compress the timing chain tensioner guide and install the EN 46330.

    Click image to see an enlarged view

    Fig. 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
    The sprocket teeth and timing chain must mesh. The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly.

  14.  
  15. Install the camshaft sprocket, timing chain, and bolt.
  16.  
  17. Inspect the sprockets for proper alignment. The mark on the camshaft sprocket should be located in the 6 o'clock position and the mark on the crankshaft sprocket should be located in the 12 o'clock position.

    Click image to see an enlarged view

    Fig. Inspect the sprockets for proper alignment

  18.  
  19. Remove the EN 46330.
    NOTE
    Do not apply threadlock to the flex plate bolts at this time.



    Click image to see an enlarged view

    Fig. Remove the EN 46330

  20.  
  21. Temporarily install the automatic transmission flex plate and bolts.
  22.  
  23. Install the J 42386-A and bolts. Use 1 M10-1.5 x 120 mm bolt and 1 M10-1.5 x 45 mm bolt for proper tool operation. Tighten the J 42386-A bolts to 37 ft. lbs. (50 Nm).

    Click image to see an enlarged view

    Fig. Install the J 42386-A and bolts

  24.  
  25. 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.

    Click image to see an enlarged view

    Fig. Tighten the camshaft sprocket bolt

  26.  
  27. Remove the J 42386-A and bolts.
  28.  
  29. Remove the automatic transmission flex plate and bolts.
  30.  
  31. Install the oil pump.
  32.  

 
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