BMW X3 2005

Cylinder Head

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Properly relieve the fuel system pressure.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Ignition coils
     
    Left side exhaust manifold
     
    Cylinder head cover
     
    Spark plugs
     
    Intake manifold
     
    Drain cooling system
     
    Thermostat housing
     
    Coolant pipe from side of block
     
    VANOS adjustment unit and camshafts with bearings
     
    Timing case cover-to- cylinder head bolts
     
    Timing chain guide
     

  6.  
  7. Remove the cylinder head bolts in reverse of sequence shown and remove the cylinder head.

    Click image to see an enlarged view

    Fig. Removing grounding straps and cylinder head bolts-3.0L engine



    Click image to see an enlarged view

    Fig. Cylinder head bolt tightening sequence-3.0L engines

  8.  

To install:

  1. Clean all sealing material from mating faces
    CAUTION
    There must be no oil in the cylinder head bolt holes in the block and timing case cover or there is a possibility of cracking and distorting torque values.

  2.  
  3. Be sure that dowel sleeve are correctly positioned in block.
  4.  
  5. Apply permanently elastic sealing compound, Drei Bond 1209, at joints to timing case cover.
  6.  
  7. Install a new cylinder head gasket.
  8.  
  9. Position the cylinder head onto the block and install new cylinder head bolts, applying a light coat of oil to the washer contact area and the threads of the new bolts.
  10.  
  11. Tighten cylinder head bolts, following the sequence shown, in 3 steps, to the following:
    1. Step 1: 30 ft. lbs. (40 Nm).
    2.  
    3. Step 2: Additional 90°.
    4.  
    5. Step 3: Additional 90°.
    6.  

  12.  
  13. Install or connect the following:

    Timing chain guide
     
    Timing case cover-to-cylinder head bolts
     
    Camshafts
     
    VANOS adjustment unit
     

  14.  
  15. Complete installation in reverse of the removal procedure.
  16.  

 
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