Aspen 2007, Durango 2006-2007

Camshaft, Bearings & Lifters

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Bearing Replacement



The cam bearings are not serviceable. Do not attempt to replace cam bearings for any reason.

Inspection



  1. Inspect the camshaft bearing journals for wear or damage.
  2.  
  3. Inspect the cylinder head and check oil return holes.
  4.  
  5. Check the tooth surface of the distributor drive gear teeth of the right camshaft for wear or damage.
  6.  
  7. Check both camshaft surfaces for wear or damage.
  8.  
  9. Check camshaft lobe height and replace if out of limit.
  10.  

Removal & Installation



3.7L & 4.7L Engines
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Remove or disconnect the following:
    NOTE
    Keep all valvetrain components in order for assembly.



    Negative battery cable
     
    Valve covers
     
    Rocker arms
     
    Hydraulic lash adjusters
     

  4.  
  5. Set the engine at Top Dead Center (TDC) of the compression stroke for the No. 1 cylinder.
  6.  
  7. Install Timing Chain Wedge 8350 to retain the chain tensioners.

    Click image to see an enlarged view

    Fig. Chain Tensioner Retaining Wedges-4.7L engine

  8.  
  9. Matchmark the timing chains to the camshaft sprockets.
  10.  
  11. Install Camshaft Holding Tool 6958 and Adapter Pins 8346 to the left camshaft sprocket.
  12.  
  13. Remove or disconnect the following:

    Right camshaft timing sprocket and target wheel
     
    Left camshaft sprocket
     
    Camshaft bearing caps, by reversing the tightening sequence
     
    Camshafts

    Click image to see an enlarged view

    Fig. Hold the left camshaft sprocket with a spanner wrench while removing or installing the camshaft sprocket bolts-3.7L and 4.7L engine



    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt tightening sequence-3.7L and 4.7L engines

     

  14.  

To install:

  1. Install or connect the following:

    Camshafts. Tighten the bearing cap bolts in 1 / 2 turn increments, in sequence, to 100 inch lbs. (11 Nm).

    Click image to see an enlarged view

    Fig. Turn the camshaft with pliers, if needed, to align the dowel in the sprocket-4.7L engine

     
    Target wheel to the right camshaft
     
    Camshaft timing sprockets and chains, by aligning the matchmarks
     

  2.  
  3. Remove the tensioner wedges and tighten the camshaft sprocket bolts to 90 ft. lbs. (122 Nm).
  4.  
  5. Install or connect the following:

    Hydraulic lash adjusters in their original locations
     
    Rocker arms in their original locations
     
    Valve covers
     
    Negative battery cable
     

  6.  

5.7L Engine
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Recover the A/C refrigerant, if equipped with air conditioning.
  6.  
  7. Set the crankshaft to Top Dead Center (TDC) of the compression stroke for the No. 1 cylinder.
  8.  
  9. Remove or disconnect the following:

    Negative battery cable
     
    Camshaft rear cam bearing core plug
     
    Air cleaner
     
    Accessory drive belt
     
    Alternator
     
    A/C compressor
     
    Radiator
     
    Intake manifold
     
    Valve covers
     
    Cylinder heads
     
    Oil pan
     
    Front cover
     
    Oil pickup tube
     
    Oil pump
     
    Timing chain and sprockets
     
    Camshaft thrust plate
     
    Hydraulic lifters
     
    Camshaft

    Click image to see an enlarged view

    Fig. Lifter group-5.7L engine

     

  10.  

To install:

  1. Install or connect the following:
    NOTE
    Lifters must be replaced in their original positions.



    Camshaft
     
    Camshaft thrust plate. Tighten the bolts to 21 ft. lbs. (28 Nm).
     
    Timing chain and sprockets
     
    Oil pump
     
    Oil pickup tube
     



    Hydraulic lifters
     
    Cylinder heads
     
    Pushrods
     
    Rocker arms
     
    Front cover
     
    Oil pan
     
    Valve covers
     
    Intake manifold
     
    A/C compressor
     
    Alternator
     
    Accessory drive belt
     
    Radiator
     
    Air cleaner
     
    Camshaft rear cam bearing core plug
     
    Negative battery cable
     

  2.  
  3. Fill the cooling system.
  4.  
  5. Recharge the A/C system, if equipped.
  6.  
  7. Start the engine and check for leaks.
  8.  

 
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