Maxima 2007

Cylinder Head

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Removal & Installation




NOTE
You must remove the engine from the vehicle in order to remove the cylinder head for this procedure.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the engine oil.
  6.  
  7. Drain the cooling system.
    NOTE
    Before detaching any hoses or connectors, note the locations for reassembly.

  8.  
  9. Remove negative battery cable
  10.  
  11. Remove engine assembly.
  12.  
  13. Remove exhaust manifold.
  14.  
  15. Place the engine on a suitable workstand.
  16.  
  17. Remove oil pan.
  18.  
  19. Remove timing chain.
  20.  
  21. Remove intake manifold.
  22.  
  23. Remove water outlet.
  24.  
  25. Remove rear timing chain case bolts, in the sequence shown.

    Click image to see an enlarged view

    Fig. Loosen the rear timing chain case bolts in sequence-Maxima 3.5L engine

  26.  
  27. Remove rear timing chain case.
  28.  
  29. Remove O-rings from the cylinder head and block.

    Click image to see an enlarged view

    Fig. Remove the O-rings from the cylinder head-Maxima 3.5L engine



    Click image to see an enlarged view

    Fig. Remove the O-rings from the engine block-Maxima 3.5L engine

  30.  
  31. Remove intake valve timing control solenoid valves.
    NOTE
    For installation purposes, matchmark the camshaft brackets before removing them.

  32.  
  33. Remove intake and exhaust camshafts and brackets. Loosen the bracket bolts in several steps, in the sequence shown.

    Click image to see an enlarged view

    Fig. Right camshaft bracket bolt loosening sequence-Maxima 3.5L engine



    Click image to see an enlarged view

    Fig. Left camshaft bracket bolt loosening sequence-Maxima 3.5L engine

  34.  
  35. Remove right and left side cam chain tensioner from the cylinder head.
  36.  
  37. Remove cylinder head bolts. Loosen in several steps, in the sequence shown.
    WARNING
    A warped or cracked cylinder head could result from removing the bolts in incorrect order.



    Click image to see an enlarged view

    Fig. Right cylinder head bolt loosening sequence-Maxima 3.5L engine



    Click image to see an enlarged view

    Fig. Left cylinder head bolt loosening sequence-Maxima 3.5L engine

  38.  
  39. Remove cylinder heads from the vehicle.
  40.  
  41. Discard the head gaskets.
  42.  
  43. Remove all traces of liquid gasket from the timing chain case and from the water pump covers.
  44.  
  45. Remove all traces of liquid gasket from the engine block.
  46.  
  47. Inspect the timing chain for excessive wear or damage and replace as necessary.
  48.  

To install:

  1. Turn the crankshaft until the No. 1 piston is a Top Dead Center (TDC) on compression stroke. The crankshaft key should face toward the right bank.
  2.  
  3. Using new head gaskets, install the cylinder heads.
    NOTE
    If possible, replacement of the head bolts is suggested.

  4.  
  5. If replacement of the head bolts is not possible, perform the following bolt measurement:
    1. Measure the diameter of the head bolt 0.43 in. (11 mm) from the bottom of the bolt.
    2.  
    3. Measure the diameter of the head bolt 1.89 in. (48 mm) from the bottom of the bolt.
    4.  
    5. Whenever the size difference between the 2 measurements exceeds 0.0043 in. (0.11 mm), the head bolts must be replaced.
    6.  

  6.  
  7. Install the cylinder head bolts and torque in sequence, as follows:
    1. Step 1: 72 ft. lbs. (98 Nm).
    2.  
    3. Step 2: Completely loosen all bolts.
    4.  
    5. Step 3: 26-32 ft. lbs. (34-44 Nm).
    6.  
    7. Step 4: plus 90-95 degrees clockwise.
    8.  
    9. Step 5: plus 90-95 degrees clockwise.

      Click image to see an enlarged view

      Fig. Right cylinder head bolt torque sequence-Maxima 3.5L engine



      Click image to see an enlarged view

      Fig. Left cylinder head bolt torque sequence-Maxima 3.5L engine

    10.  

  8.  
  9. Install or connect the following:


  10.  
  11. Install camshafts and related components.
  12.  
  13. Install intake valve timing control solenoid valves.
  14.  
  15. Install new O-rings to the front of the engine block and cylinder head.
  16.  
  17. Apply sealant to the hatched portion of the of the rear timing chain case.
  18.  
  19. Align the rear timing chain case with the dowel pins and install onto the cylinder heads and engine block.
  20.  
  21. Torque the rear timing chain case mounting bolts in sequence to 105-121 inch lbs. (11.8-13.7 Nm).
  22.  
  23. Install or connect the following:

    Water outlet
     
    Intake manifold
     
    Timing chain
     
    Oil pan
     
    Exhaust manifold
     
    Engine assembly into the vehicle
     
    Negative battery cable
     

  24.  
  25. Fill the cooling system.
  26.  
  27. Fill the engine with clean oil.
  28.  
  29. Start the vehicle, check for leaks and repair if necessary.
  30.  

 
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