H3 2006

Timing Chain Front Cover

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Removal & Installation



3.5L & 3.7L Engines

Specific to:

Hummer H3 2006-2010

  1. Remove the water pump.
  2.  
  3. Remove the crankshaft balancer.
  4.  
  5. Remove the drive belt tensioner.
  6.  
  7. Remove the power steering pump.
  8.  
  9. Reposition A/C compressor on the side, if applicable.
  10.  
  11. Remove the oil pump pipe and screen assembly.
  12.  
  13. Lower the vehicle.
  14.  
  15. Remove the 7 mm center bolt.
  16.  
  17. Remove the remaining engine front cover bolts and discard the plastic bolt retainers if present.
  18.  
  19. Install 2 bolts into the threaded holes to act as jack screws and tighten evenly to release the engine front cover from the engine block.
  20.  
  21. Remove the engine front cover.
  22.  
  23. Remove the 2 bolts from the jack screw holes.
  24.  
  25. Remove the oil pump, if necessary.
  26.  
  27. Clean and inspect the engine block sealing surface.

    Click image to see an enlarged view

    Fig. Remove the engine front cover

  28.  

To install:

  1. Install the oil pump, if previously removed.
  2.  
  3. To aid in alignment of the cover, thread the J 44219 into the engine block.
    NOTE
    The engine front cover must be installed within 10 minutes from when the sealer was applied.



    Click image to see an enlarged view

    Fig. Thread the J 44219 into the engine block

  4.  
  5. Apply a 0.12 inches (3 mm) bead of sealer to the engine front cover.

    Click image to see an enlarged view

    Fig. Sealant application

  6.  
  7. Align the oil pump to the crankshaft sprocket splines.
  8.  
  9. Position the engine front cover over the J 44219, and to the engine block.
  10.  
  11. Install the engine front cover bolts.
  12.  
  13. Remove the J 44219 from the engine block.
  14.  
  15. Install the 2 remaining engine front cover bolts. Tighten the bolts to 89 inch lbs. (10 Nm). Tighten the small center bolt (1) last to 71 inch lbs. (8 Nm).
  16.  
  17. Install the oil pump pipe and screen assembly.
  18.  
  19. Install the power steering pump.
  20.  
  21. Install the drive belt tensioner.
  22.  
  23. Install the crankshaft balancer.
  24.  
  25. Install the water pump.
  26.  

5.3L Engine

Specific to:

Hummer H3 2006-2010

  1. Remove the water pump.
  2.  
  3. Remove the crankshaft balancer.
  4.  
  5. Disconnect the engine harness electrical connector from the Camshaft Position (CMP) sensor wire harness electrical connector.
  6.  
  7. Remove the oil pan-to-front cover bolts.

    Click image to see an enlarged view

    Fig. Oil pan-to-front cover bolts (1)

  8.  
  9. Remove the front cover bolts.
  10.  
  11. Remove the front cover and gasket.
  12.  
  13. Discard the front cover gasket.
  14.  
  15. Remove the crankshaft front oil seal.

    Click image to see an enlarged view

    Fig. Remove the front cover bolts (1), front cover (2) and gasket (3)

  16.  
  17. If replacing the engine front cover perform the following steps, otherwise proceed to step 10 of the installation procedure.
  18.  
  19. Remove the CMP sensor wire harness bolts.
  20.  
  21. Disconnect the CMP sensor wire harness from the CMP sensor.
  22.  
  23. Remove the CMP sensor wire harness.
  24.  
  25. Remove the CMP sensor.

    Click image to see an enlarged view

    Fig. Remove the CMP sensor wire harness bolts (1, 6), the CMP sensor wire harness (5), and the CMP sensor (2)

  26.  

To install:


NOTE
Do not use the crankshaft oil seal or the engine front cover gasket again. Do not apply any type of sealant to the front cover gasket, unless specified.


NOTE
The special tools in this procedure are used to properly align the engine front cover at the oil pan surface and to center the crankshaft front oil seal. All gasket surfaces should be free of oil or other foreign material during assembly. The crankshaft front oil seal MUST be centered in relation to the crankshaft. The oil pan sealing surface at the front cover and engine block MUST be aligned within specifications. An improperly aligned front cover may cause premature front oil seal wear and/or engine assembly oil leaks.

  1. Install the front cover gasket, front cover, and bolts. Tighten the cover bolts finger tight. Do not overtighten.
  2.  
  3. Start the tool-to-front cover bolts. Do not tighten the bolts at this time.
  4.  
  5. Install the J 41480 tool. Tighten the tool-to-engine block bolts to 18 ft. lbs. (25 Nm).
    NOTE
    Align the tapered legs of the tool with the machined alignment surfaces on the front cover.



    Click image to see an enlarged view

    Fig. Install the J 41480 tool

  6.  
  7. Install the J 41476 tool.

    Click image to see an enlarged view

    Fig. Install the J 41476 tool

  8.  
  9. Install the crankshaft balancer bolt.
    1. Tighten the crankshaft balancer bolt by hand until snug. Do not overtighten.
    2.  
    3. Tighten the J 41480.
    4.  
    5. Tighten the engine front cover bolts to 18 ft. lbs. (25 Nm).
    6.  

  10.  
  11. Remove the tools.
  12.  
  13. Measure the oil pan surface flatness, front cover-to-engine block:
    1. Place a straight edge across the engine block and front cover oil pan sealing surfaces.
      NOTE
      Avoid contact with the portion of the gasket that protrudes into the oil pan surface.

    2.  
    3. Insert a feeler gage between the front cover and the straight edge tool. The cover must be flush with the oil pan surface or no greater than 0.02 inches (0.5 mm) below flush.

      Click image to see an enlarged view

      Fig. Front cover-to-engine block oil pan surface alignment

    4.  

  14.  
  15. If the front cover-to-engine block oil pan surface alignment is not within specifications, repeat the cover alignment procedure.
  16.  
  17. If the correct front cover-to-engine block alignment cannot be obtained, replace the front cover.
  18.  
  19. Inspect the CMP sensor O-ring seal for cuts or damage. If the seal is not cut or damaged, it may be used again.
  20.  
  21. Lubricate the O-ring seal with clean engine oil.
  22.  
  23. Install the O-ring seal onto the sensor.
  24.  
  25. Install the sensor to the cover.
  26.  
  27. Install the CMP sensor wire harness and bolts. Tighten the bolts to 106 inch lbs. (12 Nm).
  28.  
  29. Connect the engine harness electrical connector to the CMP sensor wire harness electrical connector.
  30.  
  31. Install a NEW crankshaft front oil seal.
  32.  
  33. Install the water pump.
  34.  

 
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