Liberty, Wrangler 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



2.4L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove the cylinder head cover.
  4.  
  5. Remove the camshaft position sensor and camshaft target magnet.
  6.  
  7. Remove the timing belt.
  8.  
  9. Remove the camshaft sprockets and timing belt rear cover.
  10.  
  11. Bearing caps are identified for location. Remove the outside bearing caps first.
  12.  
  13. Loosen the camshaft bearing cap attaching fasteners in the sequence shown, one camshaft at a time.
    NOTE
    Camshafts are not interchangeable. The intake cam number 6 thrust bearing face spacing is wider.



    Click image to see an enlarged view

    Fig. Camshaft bearing cap identification-2.4L engines

  14.  
  15. Identify the camshafts before removing from the head. The camshafts are not interchangeable.
  16.  
  17. Remove the camshafts from the cylinder head.
    NOTE
    If removing the rocker arms, identify for reinstallation in the original position.

  18.  
  19. Inspect the camshaft bearing journals for damage and binding. If the journals are binding, check the cylinder head for damage. Also the check cylinder head oil holes for clogging.
  20.  
  21. Check the cam lobe and bearing surfaces for abnormal wear and damage. Replace the camshaft if defective.
    NOTE
    If the camshaft is replaced due to lobe wear or damage, always replace the rocker arms.



    Click image to see an enlarged view

    Fig. Checking camshaft wear-2.4L engines

  22.  
  23. Measure the lobe actual wear (unworn area minus wear zone = actual wear) and replace the camshaft if out of limit. Standard value is 0.001 inches (0.0254 mm), wear limit is 0.010 inches (0.254 mm).
  24.  

To install:


NOTE
Ensure that NONE of the pistons are at top dead center when installing the camshafts.

  1. Lubricate all camshaft bearing journals, rocker arms and camshaft lobes.
  2.  
  3. Install all rocker arms in original positions, if reused.

    Click image to see an enlarged view

    Fig. Camshaft bearing cap torque sequence-2.4L engines

  4.  
  5. Position the camshafts on cylinder head bearing journals. Install the right and left camshaft bearing caps No. 2-5 and right No. 6. Tighten M6 fasteners to 105 inch lbs. (12 Nm) in the sequence shown.
  6.  
  7. Apply Mopar® Gasket Maker, or equivalent, to the No. 1 and No. 6 bearing caps. Install the bearing caps and tighten the M8 fasteners to 250 inch lbs. (28 Nm).
  8.  
  9. Install the camshaft oil seals.
  10.  
  11. Install the camshaft target magnet and camshaft position sensor.
  12.  
  13. Install the cylinder head cover.
  14.  
  15. Install the timing belt rear cover and camshaft sprocket.
  16.  
  17. Install the timing belt.
  18.  

3.7L Engine
  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
     
    Cylinder head 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 8379 to retain the chain tensioners.

    Click image to see an enlarged view

    Fig. Chain Tensioner Retaining Wedges-3.7L Engine

  8.  
  9. Matchmark the timing chains to the camshaft sprockets.
  10.  
  11. Install Camshaft Holding Tool 8428 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. Camshaft bearing cap bolt tightening sequence-3.7L

     

  14.  

To install:

  1. Install or connect the following:

    Camshafts. Torque the bearing cap bolts in 1 / 2 turn increments, in sequence, to 100 inch lbs. (11 Nm).
     
    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
     
    Cylinder head covers
     
    Negative battery cable
     

  6.  

4.0L 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. Remove or disconnect the following:
    NOTE
    Keep all valvetrain components in order for assembly.



    Negative battery cable
     
    Grille, if necessary
     
    Radiator
     
    A/C condenser, if equipped
     
    Distributor or camshaft sensor housing
     
    Valve cover
     



    Rocker arms and pushrods
     
    Cylinder head
     
    Hydraulic valve tappets
     
    Accessory drive belt
     
    Crankshaft damper
     
    Front cover
     
    Timing chain and gears
     
    Thrust plate
     
    Camshaft
     

  8.  

To install:

  1. Lubricate the camshaft with clean engine oil.
  2.  
  3. Install or connect the following:

    Camshaft
     
    Thrust plate. Torque the bolts to 18 ft. lbs. (24 Nm).
     
    Timing chain and gears
     
    Front cover
     
    Crankshaft damper
     
    Accessory drive belt
     
    Hydraulic valve tappets
     
    Cylinder head
     
    Rocker arms and pushrods
     
    Valve cover
     
    Distributor or camshaft sensor housing
     
    A/C condenser, if equipped
     
    Radiator
     
    Grille, if removed
     
    Negative battery cable
     

  4.  
  5. Fill and bleed the cooling system.
  6.  
  7. Recharge the A/C system, if equipped.
  8.  
  9. Start the engine, check for leaks and repair if necessary.
  10.  

 
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