BMW X3 2005

Timing Chain Cover & Seal

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Drain the engine oil.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Camshaft adjustment unit (Double VANOS), as described under Camshaft and Valve Lifters removal and installation.
     
    Alternator drive belt tensioner and belt
     
    Water pump pulley
     
    Vibration damper and hub, if equipped
     
    Oil pan
     

  6.  
  7. Drive out the dowel pins from the timing case cover toward the rear.
  8.  
  9. Remove the lower timing case cover bolts from cylinder head.
  10.  
  11. Remove the timing case cover bolts and cover.

    Click image to see an enlarged view

    Fig. Showing the timing case cover bolts and cover

  12.  

To install:

  1. Check cylinder head and gasket for possible damage.
  2.  
  3. Clean all mating surfaces.
  4.  
  5. Drive dowel pins into timing case cover until they protrude about 0.08-0.12 inch (2-3mm).
  6.  
  7. Use grease to hold timing case cover in place during installation.
  8.  
  9. Apply sealing compound, Drei Bond 1209, to joints at cylinder head gasket left and right, and thinly and evenly to entire timing case cover sealing surface adjoining the cylinder head.
  10.  
  11. Install all timing cover retaining bolts to about 36 inch lbs. (5 Nm).
  12.  
  13. Drive in the dowel pins until flush.
  14.  
  15. Torque all timing cover retaining screws, in an alternating sequence, to the following:
    1. M6 bolts: 88 inch lbs. (10 Nm).
    2.  
    3. M7 bolts: 132 inch lbs. (15 Nm).
    4.  
    5. M8 bolts: 16 ft. lbs. (22 Nm).
    6.  
    7. M10 bolts: 35 ft. lbs. (47 Nm).
    8.  
    9. Repeat the torque sequence a second time.
    10.  

  16.  
  17. Install and tighten the bolts connecting the timing case cover to the cylinder head.
  18.  
  19. Replace the crankshaft oil seal.
  20.  
  21. Install or connect the following:

    Oil pan
     
    Vibration damper and hub
     
    Water pump pulley
     
    Drive belt tensioner and belt
     
    Camshaft (Double VANOS) adjustment unit
     
    Negative battery cable.
     

  22.  
  23. Refill the engine oil.
  24.  

 
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