Liberty, Wrangler 2006-2007

Timing Chain & Sprockets

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Removal & Installation



3.7L Engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this manual.
  2.  
  3. Drain the cooling system.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Valve covers
     
    Radiator fan
     

  6.  
  7. Rotate the crankshaft so that the crankshaft timing mark aligns with the Top Dead Center (TDC) mark on the front cover, and the V6 marks on the camshaft sprockets are at 12 o-clock.

    Power steering pump
     
    Access plugs from the cylinder heads
     
    Oil fill housing
     
    Crankshaft damper

    Click image to see an enlarged view

    Fig. Camshaft sprocket timing marks-3.7L engine



    Click image to see an enlarged view

    Fig. Crankshaft timing marks-3.7L engine



    Click image to see an enlarged view

    Fig. Cylinder head access plugs-3.7L engine

     

  8.  
  9. Compress the primary timing chain tensioner and install a lockpin.
  10.  
  11. Remove the secondary timing chain tensioners.
  12.  
  13. Hold the left camshaft with adjustable pliers and remove the sprocket and chain. Rotate the left camshaft 15 degrees clockwise to the neutral position.
  14.  
  15. Hold the right camshaft with adjustable pliers and remove the camshaft sprocket. Rotate the right camshaft 45 degrees counterclockwise to the neutral position.
  16.  
  17. Remove the primary timing chain and sprockets.
  18.  

To install:

Click image to see an enlarged view

Fig. Secondary timing chain tensioner preparation-3.7L engine

  1. Use a small prytool to hold the ratchet pawl and compress the secondary timing chain tensioners in a vise and install locking pins.
    NOTE
    The black bolts fasten the guide to the engine block and the silver bolts fasten the guide to the cylinder head.

  2.  
  3. Install or connect the following:

    Secondary timing chain guides. Tighten the bolts to 21 ft. lbs. (28 Nm).
     
    Secondary timing chains to the idler sprocket so that the double plated links on each chain are visible through the slots in the primary idler sprocket
     

  4.  
  5. Lock the secondary timing chains to the idler sprocket with Timing Chain Locking tool as shown.

    Click image to see an enlarged view

    Fig. Installing the idler gear and timing chain-3.7L engine



    Click image to see an enlarged view

    Fig. Counterbalance shaft timing marks-3.7L engine



    Click image to see an enlarged view

    Fig. Tightening the left side camshaft sprocket-3.7L engine



    Click image to see an enlarged view

    Fig. Tightening the right side camshaft sprocket-3.7L engine



    Click image to see an enlarged view

    Fig. Use the Timing Chain Locking tool to lock the timing chains on the idler gear-3.7L engine



    Click image to see an enlarged view

    Fig. Timing chain system and alignment marks-3.7L engine

  6.  
  7. Align the primary chain double plated links with the idler sprocket timing mark and the single plated link with the crankshaft sprocket timing mark.
  8.  
  9. Install the primary chain and sprockets. Tighten the idler sprocket bolt to 25 ft. lbs. (34 Nm).
  10.  
  11. Align the secondary chain single plated links with the timing marks on the secondary sprockets. Align the dot at the L mark on the left sprocket with the plated link on the left chain and the dot at the R mark on the right sprocket with the plated link on the right chain.
  12.  
  13. Rotate the camshafts back from the neutral position and install the camshaft sprockets.
  14.  
  15. Remove the secondary chain locking tool.
  16.  
  17. Remove the primary and secondary timing chain tensioner locking pins.
  18.  
  19. Hold the camshaft sprockets with a spanner wrench and tighten the retaining bolts to 90 ft. lbs. (122 Nm).

    Click image to see an enlarged view

    Fig. Timing cover bolt torque sequence-3.7L engine

  20.  
  21. Install or connect the following:

    Front cover. Tighten the bolts, in sequence, to 40 ft. lbs. (54 Nm).
     
    Front crankshaft seal
     
    Cylinder head access plugs
     
    A/C compressor
     
    Alternator
     
    Accessory drive belt tensioner. Tighten the bolt to 40 ft. lbs. (54 Nm).
     
    Oil fill housing
     
    Crankshaft damper. Tighten the bolt to 130 ft. lbs. (175 Nm).
     
    Power steering pump
     
    Lower radiator hose
     
    Heater hoses
     
    Accessory drive belt
     
    Engine cooling fan and shroud
     
    Camshaft Position (CMP) sensor
     
    Valve covers
     
    Negative battery cable
     

  22.  
  23. Fill and bleed the cooling system.
  24.  
  25. Start the engine, check for leaks and repair if necessary.
  26.  

4.0L Engine
  1. Disconnect negative cable from battery.
  2.  
  3. Remove the fan and shroud.
  4.  
  5. Remove the serpentine drive belt.
  6.  
  7. Remove the crankshaft vibration damper.
  8.  
  9. Remove the timing case cover.
  10.  
  11. Rotate crankshaft until the -0- timing mark is closest to and on the center line with camshaft sprocket timing mark.
  12.  
  13. Remove the oil slinger from the crankshaft.
  14.  
  15. Remove the camshaft sprocket bolt and washer.
  16.  
  17. Remove the crankshaft sprocket, camshaft sprocket and timing chain as an assembly.
  18.  
  19. Installation of the timing chain with the timing marks on the crankshaft and camshaft sprockets properly aligned ensures correct valve timing. A worn or stretched timing chain will adversely affect valve timing. If the timing chain deflects more than 12.7 mm ( 1 / 2 inch) replace it.
  20.  

To install:


NOTE
Assemble the timing chain, crankshaft sprocket and camshaft sprocket with the timing marks aligned.

  1. Apply Mopar® Silicone Rubber Adhesive Sealant to the keyway in the crankshaft and insert the key. With the key in the keyway on the crankshaft, install the assembly on the crankshaft and camshaft.
  2.  
  3. Install the camshaft sprocket bolt and washer. Tighten the bolt to 50 ft. lbs. (68 Nm) torque.
  4.  
  5. To verify correct installation of the timing chain, rotate the crankshaft 2 revolutions. The camshaft and crankshaft sprocket timing mark should align.
  6.  
  7. Install the crankshaft oil slinger.
  8.  
  9. Replace the oil seal in the timing case cover.
  10.  
  11. Install the timing case cover and gasket.
  12.  
  13. With the key installed in the crankshaft keyway, install the vibration damper.
  14.  
  15. Install the serpentine drive belt.
  16.  
  17. Install the fan, hub assembly and shroud.
  18.  
  19. Connect negative cable to battery.
  20.  

 
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