Commander 2006-2007

Timing Chain & Sprockets

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Removal & Installation



3.7L Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Drain cooling system.
  4.  
  5. Remove right and left cylinder head covers.
  6.  
  7. Remove radiator fan.
  8.  
  9. Rotate engine until timing mark on crankshaft damper aligns with TDC mark on timing chain cover.

    Click image to see an enlarged view

    Fig. Aligning timing marks-3.7L and 4.7L engines

  10.  
  11. Align the camshaft sprocket so the -V6- marks are at the 12 o'clock position.

    Click image to see an enlarged view

    Fig. Aligning timing chain sprockets-3.7L engine

  12.  
  13. Remove power steering pump.
  14.  
  15. Remove access plugs from left and right cylinder heads for access to chain guide fasteners.
  16.  
  17. Remove the oil fill housing to gain access to the right side tensioner arm fastener.
  18.  
  19. Remove crankshaft damper and timing chain cover (see timing chain cover removal procedure.)
  20.  
  21. Collapse and pin primary chain tensioner.
    WARNING
    Plate behind left secondary chain tensioner could fall into oil pan. Therefore, cover pan opening.

  22.  
  23. Remove secondary chain tensioners.

    Click image to see an enlarged view

    Fig. Removing access plugs-3.7L engine

  24.  
  25. Remove camshaft position sensor.
    WARNING
    Care should be taken not to damage camshaft target wheel. Do not hold target wheel while loosening or tightening camshaft sprocket. Do not place the target wheel near a magnetic source of any kind. A damaged or magnetized target wheel could cause a vehicle no start condition.


    WARNING
    Do not forcefully rotate the camshafts or crankshaft independently of each other. Damaging intake valve to piston contact will occur. Ensure negative battery cable is disconnected to guard against accidental starter engagement.

  26.  
  27. Remove left and right camshaft sprocket bolts.
  28.  
  29. While holding the left camshaft steel tube Camshaft Holder 8428, remove the left camshaft sprocket. Slowly rotate the camshaft approximately 5 degrees clockwise to a neutral position.
  30.  
  31. While holding the right camshaft steel tube with Camshaft Holder 8428, remove the right camshaft sprocket.

    Click image to see an enlarged view

    Fig. Removing camshaft sprocket-3.7L engine

  32.  
  33. Remove idler sprocket assembly bolt.
  34.  
  35. Slide the idler sprocket assembly and crank sprocket forward simultaneously to remove the primary and secondary chains.
  36.  
  37. Remove both pivoting tensioner arms and chain guides.
  38.  
  39. Remove primary chain tensioner.
  40.  

To install:

  1. Using a vise, lightly compress the secondary chain tensioner piston until the piston step is flush with the tensioner body. Using a pin or suitable tool, release ratchet pawl by pulling pawl back against spring force through access hole on side of tensioner. While continuing to hold pawl back, Push ratchet device to approximately 2 mm from the tensioner body. Install Special Tool 8514 lock pin into hole on front of tensioner. Slowly open vise to transfer piston spring force to lock pin.
  2.  
  3. Position primary chain tensioner over oil pump and insert bolts into lower two holes on tensioner bracket. Tighten bolts to 250 inch lbs. (28 Nm).
  4.  
  5. Install right side chain tensioner arm. Apply Mopar® Lock N, Seal to Torx® bolt, and tighten Torx® bolt to 250 inch lbs. (28 Nm).
    NOTE
    .The silver bolts retain the guides to the cylinder heads and the black bolts retain the guides to the engine block.



    Click image to see an enlarged view

    Fig. Positioning timing chain tensioner-3.7L engine

  6.  
  7. Install the left side chain guide. Tighten the bolts to 250 inch lbs. (28 Nm).
  8.  
  9. Install left side chain tensioner arm. Apply Mopar® Lock N, Seal to Torx® bolt and tighten Torx® bolt to 250 inch lbs. (28 Nm).
  10.  
  11. Install the right side chain guide. Tighten the bolts to 250 inch lbs. (28 Nm).
  12.  
  13. Install both secondary chains onto the idler sprocket. Align two plated links on the secondary chains to be visible through the two lower openings on the idler sprocket (4 o'clock and 8 o'clock). Once the secondary timing chains are installed, position special tool 8429 to hold chains in place for installation.
  14.  
  15. Align primary chain double plated links with the timing mark at 12 o'clock on the idler sprocket. Align the primary chain single plated links with the timing mark at 6 o'clock on the crankshaft sprocket.
  16.  
  17. Lubricate idler shaft and bushings with clean engine oil.
    NOTE
    The idler sprocket must be timed to the counterbalance shaft drive gear before the idler sprocket is fully seated.

  18.  
  19. Install all chains, crankshaft sprocket, and idler sprocket as an assembly. After guiding both secondary chains through the block and cylinder head openings, affix chains with an elastic strap or equivalent. This will maintain tension on chains to aid in installation. Align the timing mark on the idler sprocket gear to the timing mark on the counterbalance shaft drive gear, then seat idler sprocket fully. Before installing idler sprocket bolt, lubricate washer with oil, and tighten idler sprocket assembly retaining bolt to 25 ft. lbs. (34 Nm).
    NOTE
    It will be necessary to slightly rotate camshafts for sprocket installation.

  20.  
  21. Align left camshaft sprocket -L- dot to plated link on chain.
  22.  
  23. Align right camshaft sprocket -R- dot to plated link on chain.
    NOTE
    Remove excess oil from the camshaft sprocket bolt. Failure to do so can result in over-torque of bolt resulting in bolt failure.



    Click image to see an enlarged view

    Fig. Aligning left and right camshaft sprocket links-3.7L engine

  24.  
  25. Remove Special Tool 8429, then attach both sprockets to camshafts. Remove excess oil from bolts, then install sprocket bolts, but do not tighten at this time.
  26.  
  27. Verify that all plated links are aligned with the marks on all sprockets and the -V6- marks on camshaft sprockets are at the 12 o'clock position.
    WARNING
    Ensure the plate between the left secondary chain tensioner and block is correctly installed.

  28.  
  29. Install both secondary chain tensioners. Tighten bolts to 250 inch lbs. (28 Nm).
    NOTE
    Left and right secondary chain tensioners are not common.

  30.  
  31. Remove all locking pins from tensioners.
    WARNING
    After pulling locking pins out of each tensioner, DO NOT manually extend the tensioner(s) ratchet. Doing so will over tension the chains, resulting in noise and/or high timing chain loads.

  32.  
  33. Using Special Tool 6958, Spanner with Adaptor Pins 8346, tighten left and right camshaft sprocket bolts to 90 ft.lbs. (122 Nm).

    Click image to see an enlarged view

    Fig. Tightening left camshaft sprocket bolts-3.7L and 4.7L engines

  34.  
  35. Rotate engine two full revolutions. Verify timing marks are at the following locations:

    Primary chain idler sprocket dot is at 12 o'clock
     
    Primary chain crankshaft sprocket dot is at 6 o'clock
     
    Secondary chain camshaft sprockets -V6- marks are at 12 o'clock
     
    Balance shaft drive gear dot is aligned to the idler sprocket gear dot

    Click image to see an enlarged view

    Fig. Tightening right camshaft sprocket bolts-3.7L and 4.7L engines

     

  36.  
  37. Lubricate all three chains with engine oil.
  38.  
  39. After installing all chains, it is recommended that the idler gear end play be checked. The end play must be within 0.004 - 0.010 inches (0.10 -0.25 mm). If not within specification, the idler gear and idler shaft must be replaced.
  40.  
  41. Install timing chain cover and crankshaft damper. (See timing chain cover installation procedure.)
  42.  
  43. Install cylinder head covers.
    NOTE
    Before installing threaded plug in right cylinder head, the plug must be coated with sealant to prevent leaks.

  44.  
  45. Coat the large threaded access plug with Mopar® Thread Sealant with Teflon, then install into the right cylinder head and tighten to 60 ft. lbs. (81 Nm).
  46.  
  47. Install the oil fill housing.
  48.  
  49. Install access plug in left cylinder head.
  50.  
  51. Install power steering pump.
  52.  
  53. Install radiator fan.
  54.  
  55. Fill cooling system.
  56.  
  57. Connect negative cable to battery.
  58.  

4.7L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Drain cooling system.
  4.  
  5. Remove right and left cylinder head covers.
  6.  
  7. Remove radiator fan.
  8.  
  9. Rotate engine until timing mark on crankshaft damper aligns with TDC mark on timing chain cover.

    Click image to see an enlarged view

    Fig. Aligning timing marks-4.7L engine

  10.  
  11. Align the camshaft sprocket so the -V8- marks are at the 12 o'clock position.

    Click image to see an enlarged view

    Fig. Aligning timing chain sprockets-3.7L engine (4.7L engine similar)

  12.  
  13. Remove power steering pump.
  14.  
  15. Remove access plugs from left and right cylinder heads for access to chain guide fasteners.
  16.  
  17. Remove the oil fill housing to gain access to the right side tensioner arm fastener.
  18.  
  19. Remove crankshaft damper and timing chain cover (see timing chain cover removal procedure.)
  20.  
  21. Collapse and pin primary chain tensioner.
    WARNING
    Plate behind left secondary chain tensioner could fall into oil pan. Therefore, cover pan opening.

  22.  
  23. Remove secondary chain tensioners.

    Click image to see an enlarged view

    Fig. Removing access plugs-4.7L engine

  24.  
  25. Remove camshaft position sensor from right cylinder head.
    WARNING
    Care should be taken not to damage camshaft target wheel. Do not hold target wheel while loosening or tightening camshaft sprocket. Do not place the target wheel near a magnetic source of any kind. A damaged or magnetized target wheel could cause a vehicle no start condition.


    WARNING
    Do not forcefully rotate the camshafts or crankshaft independently of each other. Damaging intake valve to piston contact will occur. Ensure negative battery cable is disconnected to guard against accidental starter engagement.

  26.  
  27. Remove left and right camshaft sprocket bolts.
  28.  
  29. While holding the left camshaft steel tube with adjustable pliers, remove the left camshaft sprocket. Slowly rotate the camshaft approximately 15 degrees clockwise to a neutral position.
  30.  
  31. While holding the right camshaft steel tube with adjustable pliers, remove the right camshaft sprocket. Slowly rotate the camshaft approximately 45 degrees counterclockwise to a neutral position.

    Click image to see an enlarged view

    Fig. Removing camshaft sprocket-4.7L engine

  32.  
  33. Remove idler sprocket assembly bolt.
  34.  
  35. Slide the idler sprocket assembly and crank sprocket forward simultaneously to remove the primary and secondary chains.
  36.  
  37. Remove both pivoting tensioner arms and chain guides.
  38.  
  39. Remove chain tensioner.
  40.  

To install:

  1. Using a vise, lightly compress the secondary chain tensioner piston until the piston step is flush with the tensioner body. Using a pin or suitable tool, release ratchet pawl by pulling pawl back against spring force through access hole on side of tensioner. While continuing to hold pawl back, Push ratchet device to approximately 2 mm from the tensioner body. Install Special Tool 8514 lock pin into hole on front of tensioner. Slowly open vise to transfer piston spring force to lock pin.
  2.  
  3. Position primary chain tensioner over oil pump and insert bolts into lower two holes on tensioner bracket. Tighten bolts to 250 inch lbs. (28 Nm).
  4.  
  5. Install right side chain tensioner arm. Apply Mopar® Lock N, Seal to torx® bolt, and tighten Torx® bolt to 250 inch lbs. (28 Nm).
    NOTE
    .The silver bolts retain the guides to the cylinder heads and the black bolts retain the guides to the engine block.



    Click image to see an enlarged view

    Fig. Positioning timing chain tensioner-4.7L engine

  6.  
  7. Install the left side . Tighten the bolts to 250 inch lbs. (28 Nm).
    WARNING
    Overtightening the tensioner arm torx® bolt can cause severe damage to the cylinder head. Tighten torx® bolt to specified torque only.

  8.  
  9. Install left side chain tensioner arm. Apply Mopar® Lock N, Seal to Torx® bolt and tighten Torx® bolt to 250 inch lbs. (28 Nm).
  10.  
  11. Install the right side chain guide. Tighten the bolts to 250 inch lbs. (28 Nm).
  12.  
  13. Install both secondary chains onto the idler sprocket. Align two plated links on the secondary chains to be visible through the two lower openings on the idler sprocket (4 o'clock and 8 o'clock). Once the secondary timing chains are installed, position special tool 8429 to hold chains in place for installation.
  14.  
  15. Align primary chain double plated links with the timing mark at 12 o'clock on the idler sprocket. Align the primary chain single plated links with the timing mark at 6 o'clock on the crankshaft sprocket.
  16.  
  17. Lubricate idler shaft and bushings with clean engine oil.
  18.  
  19. Install all chains, crankshaft sprocket, and idler sprocket as an assembly. After guiding both secondary chains through the block and cylinder head openings, affix chains with an elastic strap or equivalent. This will maintain tension on chains to aid in installation.
    NOTE
    It will be necessary to slightly rotate camshafts for sprocket installation.

  20.  
  21. Align left camshaft sprocket -L- dot to plated link on chain.
  22.  
  23. Align right camshaft sprocket -R- dot to plated link on chain.
    NOTE
    Remove excess oil from the camshaft sprocket bolt. Failure to do so can result in over-torque of bolt resulting in bolt failure.



    Click image to see an enlarged view

    Fig. Aligning left and right camshaft sprocket links-3.7L engine

  24.  
  25. Remove Special Tool 8429, then attach both sprockets to camshafts. Remove excess oil from bolts, then install sprocket bolts, but do not tighten at this time.
  26.  
  27. Verify that all plated links are aligned with the marks on all sprockets and the -V8- marks on camshaft sprockets are at the 12 o'clock position.
    WARNING
    Ensure the plate between the left secondary chain tensioner and block is correctly installed.

  28.  
  29. Install both secondary chain tensioners. Tighten bolts to 250 inch lbs. (28 Nm).
    NOTE
    Left and right secondary chain tensioners are not common.

  30.  
  31. Before installing idler sprocket bolt, lubricate washer with oil, and then tighten idler sprocket assembly retaining bolt to 25 ft. lbs. (34 Nm).
  32.  
  33. Remove all 3 locking pins from tensioners.
    WARNING
    After pulling locking pins out of each tensioner, DO NOT manually extend the tensioner(s) ratchet. Doing so will over tension the chains, resulting in noise and/or high timing chain loads.

  34.  
  35. Using Special Tool 6958, Spanner with Adaptor Pins 8346, tighten left and right camshaft sprocket bolts to 90 ft.lbs. (122 Nm).

    Click image to see an enlarged view

    Fig. Tightening left camshaft sprocket bolts-3.7L and 4.7L engines

  36.  
  37. Rotate engine two full revolutions. Verify timing marks are at the following locations:

    Primary chain idler sprocket dot is at 12 o'clock
     
    Primary chain crankshaft sprocket dot is at 6 o'clock
     
    Secondary chain camshaft sprockets -V8- marks are at 12 o'clock

    Click image to see an enlarged view

    Fig. Tightening right camshaft sprocket bolts-3.7L and 4.7L engines

     

  38.  
  39. Lubricate all three chains with engine oil.
  40.  
  41. After installing all chains, it is recommended that the idler gear end play be checked. The end play must be within 0.004 - 0.010 inches (0.10 -0.25 mm). If not within specification, the idler gear and idler shaft must be replaced.
  42.  
  43. Install timing chain cover and crankshaft damper. (See timing chain cover installation procedure.)
  44.  
  45. Install cylinder head covers.
    NOTE
    Before installing threaded plug in right cylinder head, the plug must be coated with sealant to prevent leaks.

  46.  
  47. Coat the large threaded access plug with Mopar® Thread Sealant with Teflon, then install into the right cylinder head and tighten to 60 ft. lbs. (81 Nm).
  48.  
  49. Install the oil fill housing.
  50.  
  51. Install access plug in left cylinder head.
  52.  
  53. Install power steering pump.
  54.  
  55. Install radiator fan.
  56.  
  57. Fill cooling system.
  58.  
  59. Connect negative cable to battery.
  60.  

5.7L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Drain cooling system.
  4.  
  5. Remove timing chain cover (see timing chain cover removal procedure.)
  6.  
  7. Using the vibration damper bolt, and a suitable socket and breaker bar, rotate the crankshaft to align timing chain sprockets and keyways.
    WARNING
    The camshaft pin and the slot in the cam sprocket must be clocked at 12:00. The crankshaft keyway must be clocked at 2:00. The crankshaft sprocket must be installed so that the dots and or paint marking is at 6:00.



    Click image to see an enlarged view

    Fig. Removing timing chain-5.7L engine

  8.  
  9. Remove oil pump.

    Click image to see an enlarged view

    Fig. Removing oil pump-5.7L engine

  10.  
  11. Retract tensioner shoe until hole in shoe lines up with hole in bracket.

    Click image to see an enlarged view

    Fig. Retracting tensioner shoe-5.7L engine

  12.  
  13. Install Tensioner Pin 8514 into the holes.
  14.  
  15. Remove camshaft sprocket attaching bolt and remove timing chain with crankshaft and camshaft sprockets.
  16.  
  17. If tensioner assembly is to be replaced, remove the tensioner to block bolts and remove tensioner assembly.
  18.  

To install:

  1. If tensioner assembly is being replaced, install tensioner and mounting bolts. Tighten bolts to 250 inch lbs. (28 Nm).
  2.  
  3. Retract tensioner if required.
    WARNING
    The timing chain must be installed with the single plated link aligned with the dot and or paint marking on the camshaft sprocket. The crankshaft sprocket is aligned with the dot and or paint marking on the sprocket between two plated timing chain links.


    WARNING
    The camshaft pin and the slot in the cam sprocket must be clocked at 12:00. The crankshaft keyway must be clocked at 2:00. The crankshaft sprocket must be installed so that the dots and or paint marking is at 6:00.

  4.  
  5. Place timing chain around both sprockets with timing marks aligned with the plated links.
  6.  
  7. Slide both sprockets evenly over their respective shafts and check alignment of timing marks.
  8.  
  9. Install the camshaft bolt. Tighten the bolt to 90 ft. lbs. (122 Nm).
  10.  
  11. Remove tensioner pin. Again, verify alignment of timing marks.
  12.  
  13. Install the oil pump.
  14.  
  15. Install the timing chain cover (see timing chain cover installation procedure.)
  16.  
  17. Fill engine with oil.
  18.  
  19. Fill cooling system.
  20.  
  21. Connect the negative battery cable.
  22.  
  23. Start engine and check for leaks
  24.  

 
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