Grand Cherokee 2006-2007

Cylinder Head

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Removal & Installation



3.7L Engine
Left Side
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Properly relieve the fuel system pressure.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Exhaust Y-pipe
     
    Intake manifold
     
    Cylinder head cover
     
    Engine cooling fan and shroud
     
    Accessory drive belt
     
    Power steering pump
     

  8.  
  9. 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 as shown.

    Crankshaft damper
     
    Front cover

    Click image to see an enlarged view

    Fig. Camshaft sprocket timing marks-3.7L

     

  10.  
  11. Lock the secondary timing chain to the idler sprocket with Timing Chain Locking tool 8429.

    Click image to see an enlarged view

    Fig. Camshaft locking tool-3.7L

  12.  
  13. Matchmark the secondary timing chain one link on each side of the V6 mark to the camshaft sprocket.
    NOTE
    The cylinder head is retained by twelve bolts. Four of the bolts are smaller and are at the front of the head.



    Left secondary timing chain tensioner
     
    Cylinder head access plug
     
    Secondary timing chain guide
     
    Camshaft sprocket
     
    Cylinder head
     

  14.  

To install:

Click image to see an enlarged view

Fig. Examine the head bolts for signs of stretching-3.7L engine

  1. Check the cylinder head bolts for signs of stretching and replace as necessary.
  2.  
  3. Lubricate the threads of the 11mm bolts with clean engine oil.
  4.  
  5. Coat the threads of the 8mm bolts with Mopar® Lock and Seal Adhesive, or equivalent.
  6.  
  7. Install the cylinder heads. Use new gaskets and tighten the bolts, in sequence, as follows:
    1. Step 1: Bolts 1-8 to 20 ft. lbs. (27 Nm)
    2.  
    3. Step 2: Bolts 1-10 verify torque without loosening
    4.  
    5. Step 3: Bolts 9-12 to 10 ft. lbs. (14 Nm)
    6.  
    7. Step 4: Bolts 1-8 plus 1 / 4 (90 degree) turn
    8.  
    9. Step 5: Bolts 1-8 plus 1 / 4 (90 degree) turn again
    10.  
    11. Step 6: Bolts 9-12 to 19 ft. lbs. (26 Nm)

      Click image to see an enlarged view

      Fig. Cylinder head bolt torque sequence-3.7L

    12.  

  8.  
  9. Install or connect the following:

    Camshaft sprocket. Align the secondary chain matchmarks and tighten the bolt to 90 ft. lbs. (122 Nm).
     
    Secondary timing chain guide
     
    Cylinder head access plug
     
    Secondary timing chain tensioner. Refer to the timing chain procedure in this section.
     

  10.  
  11. Remove the Timing Chain Locking tool.
  12.  
  13. Install or connect the following:

    Front cover
     
    Crankshaft damper. Torque the bolt to 130 ft. lbs. (175 Nm).
     
    Power steering pump
     
    Accessory drive belt
     
    Engine cooling fan and shroud
     
    Cover
     
    Intake manifold
     
    Exhaust Y-pipe
     
    Negative battery cable
     

  14.  
  15. Fill and bleed the cooling system.
  16.  
  17. Start the engine, check for leaks and repair if necessary.
  18.  

Right Side
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Properly relieve the fuel system pressure.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Exhaust Y-pipe
     
    Intake manifold
     
    Valve cover
     
    Engine cooling fan and shroud
     
    Accessory drive belt
     
    Oil fill housing
     
    Power steering pump
     

  8.  
  9. 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 as shown.

    Click image to see an enlarged view

    Fig. Crankshaft timing marks-3.7L engine



    Click image to see an enlarged view

    Fig. Camshaft positioning-3.7L engine

  10.  
  11. Remove or disconnect the following:

    Crankshaft damper
     
    Front cover
     

  12.  
  13. Lock the secondary timing chains to the idler sprocket with Timing Chain Locking tool 8429.
  14.  
  15. Matchmark the secondary timing chains to the camshaft sprockets.
  16.  
  17. Remove or disconnect the following:
    NOTE
    Each cylinder head is retained by eight 11mm bolts and four 8mm bolts.



    Secondary timing chain tensioners
     
    Cylinder head access plugs
     
    Secondary timing chain guides
     
    Camshaft sprockets
     
    Cylinder heads
     

  18.  

To install:

  1. Check the cylinder head bolts for signs of stretching and replace as necessary.
  2.  
  3. Lubricate the threads of the 11mm bolts with clean engine oil.
  4.  
  5. Coat the threads of the 8mm bolts with Mopar® Lock and Seal Adhesive, or equivalent.
  6.  
  7. Install the cylinder heads. Use new gaskets and tighten the bolts, in sequence, as follows:
    1. Step 1: Bolts 1-8 to 20 ft. lbs. (27 Nm)
    2.  
    3. Step 2: Bolts 1-10 verify torque without loosening
    4.  
    5. Step 3: Bolts 9-12 to 10 ft. lbs. (14 Nm)
    6.  
    7. Step 4: Bolts 1-8 plus 1 / 4 (90 degree) turn
    8.  
    9. Step 5: Bolts 9-12 to 19 ft. lbs. (26 Nm)
    10.  

  8.  
  9. Install or connect the following:

    Camshaft sprockets. Align the secondary chain matchmarks and tighten the bolts to 90 ft. lbs. (122 Nm).
     
    Secondary timing chain guides
     
    Cylinder head access plugs
     
    Secondary timing chain tensioners. Refer to the timing chain procedure in this section.
     

  10.  
  11. Remove the Timing Chain Locking tool.
  12.  
  13. Install or connect the following:

    Front cover
     
    Crankshaft damper. Torque the bolt to 130 ft. lbs. (175 Nm).
     
    Rocker arms
     
    Power steering pump
     
    Oil fill housing
     
    Accessory drive belt
     
    Engine cooling fan and shroud
     
    Valve covers
     
    Intake manifold
     
    Exhaust Y-pipe
     
    Negative battery cable
     

  14.  
  15. Fill and bleed the cooling system.
  16.  
  17. Start the engine, check for leaks and repair if necessary.
  18.  

4.7L Engine
Left Side
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Exhaust pipe
     
    Intake manifold
     
    Cylinder head cover
     
    Fan shroud and fan
     
    Accessory drive belt
     
    Power steering pump
     

  6.  
  7. Rotate the crankshaft until the damper mark is aligned with the TDC mark. Verify that the V8 mark on the camshaft sprocket is at the 12 o-clock position.
  8.  
  9. Remove or disconnect the following:

    Vibration damper
     
    Timing chain cover
     

  10.  
  11. Lock the secondary timing chains to the idler sprocket with tool 8515, or equivalent.
  12.  
  13. Mark the secondary timing chain, on link on either side of the V8 mark on the cam sprocket.
  14.  
  15. Remove the left side secondary chain tensioner.
  16.  
  17. Remove the cylinder head access plug.
  18.  
  19. Remove the chain guide.
  20.  
  21. Remove the camshaft sprocket.
    NOTE
    There are 4 smaller bolts at the front of the head. Don-t overlook these.

  22.  
  23. Remove the head bolts and head.
    WARNING
    Don-t lay the head on its sealing surface. Due to the design of the head gasket, any distortion to the head sealing surface will result in leaks.



    Click image to see an enlarged view

    Fig. Cylinder head tightening sequence-4.7L engine

  24.  
  25. Installation is the reverse of removal. Observe the following:

    Check the head bolts. If any necking is observed, replace the bolt.
     
    The 4 small bolts must be coated with sealer.
     
    The head bolts are tightened in the following sequence:
     

  26.  

Step 1: Bolts 1-10 to 15 ft. lbs. (20 Nm)

Step 2: Bolts 1-10 to 35 ft. lbs. (47 Nm)

Step 3: Bolts 11-14 to 18 ft. lbs. (25 Nm)

Step 4: Bolts 1-10 90 degrees

Step 5: Bolts 11-14 to 22 ft. lbs. (30 Nm)

Right Side
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Exhaust pipe
     
    Intake manifold
     
    Cylinder head cover
     
    Fan shroud and fan
     
    Oil filler housing
     
    Accessory drive belt
     

  6.  
  7. Rotate the crankshaft until the damper mark is aligned with the TDC mark. Verify that the V8 mark on the camshaft sprocket is at the 12 o-clock position.
  8.  
  9. Remove or disconnect the following:

    Vibration damper
     
    Timing chain cover
     

  10.  
  11. Lock the secondary timing chains to the idler sprocket with tool 8515, or equivalent.
  12.  
  13. Mark the secondary timing chain, on link on either side of the V8 mark on the cam sprocket.
  14.  
  15. Remove the left side secondary chain tensioner.
  16.  
  17. Remove the cylinder head access plug.
  18.  
  19. Remove the chain guide.
  20.  
  21. Remove the camshaft sprocket.
    WARNING
    Do not pry on the target wheel for any reason!


    NOTE
    There are 4 smaller bolts at the front of the head. Don-t overlook these.

  22.  
  23. Remove the head bolts and head.
    WARNING
    Do not lay the head on its sealing surface. Due to the design of the head gasket, any distortion to the head sealing surface will result in leaks.

  24.  
  25. Installation is the reverse of removal. Observe the following:

    Check the head bolts. If any necking is observed, replace the bolt.
     
    The 4 small bolts must be coated with sealer.
     
    The head bolts are tightened in the following sequence:
     

  26.  

Step 1: Bolts 1-10 to 15 ft. lbs. (20 Nm)

Step 2: Bolts 1-10 to 35 ft. lbs. (47 Nm)

Step 3: Bolts 11-14 to 18 ft. lbs. (25 Nm)

Step 4: Bolts 1-10 90 degrees

Step 5: Bolts 11-14 to 22 ft. lbs. (30 Nm)

5.7L Engine
  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Properly relieve the fuel system pressure.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Air cleaner resonator and ducts
     
    Alternator
     
    Closed crankcase ventilation system
     
    EVAP control system
     
    Heater hoses
     
    Cylinder head covers
     
    Intake manifold
     
    Rocker arms and pushrods
     
    Cylinder heads
     

  8.  

To install:


NOTE
The head gaskets are not interchangeable. They are marked -L- and -R-.



Click image to see an enlarged view

Fig. Cylinder head torque sequence-5.7L engine

  1. Install the cylinder heads. Use new gaskets and tighten the bolts, in sequence, as follows:
    1. Step 1: 12 mm bolts-25 ft. lbs. (34 Nm); 8mm bolts-15 ft. lbs. (20 Nm)
    2.  
    3. Step 2: 12mm bolts-40 ft. lbs. (54 Nm); 8mm bolts retorque-15 ft. lbs. (20 Nm)
    4.  
    5. Step 3: 12mm bolts-plus 90 degrees; 8mm bolts-25 ft. lbs. (34 Nm)
    6.  

  2.  
  3. Install or connect the following:

    Rocker arms and pushrods
     
    Intake manifold
     
    Heater hoses
     
    Alternator
     
    Cylinder head covers.
     
    Air cleaner resonator and ducts
     
    Negative battery cable
     

  4.  

 
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