BMW Cars 1999-06

Rocker Arms & Shafts

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Removal & Installation



  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Cylinder head cover
     
    Spark plugs
     
    Engine cooling fan
     

  4.  
  5. To remove a rocker, rotate the engine until the lobe of the camshaft for the rocker to be removed is pointing up.
  6.  
  7. Insert Tool No. 11 5 130 between the camshaft and the valve, then press the valve down and remove the rocker.
    NOTE
    The Hydraulic Valve Adjuster (HVA) can also be replaced once the rocker is removed. To install:


    NOTE
    The rockers must be installed in the exact position from which they were removed. The rocker has a slight bend away from the camshaft journal.

  8.  
  9. Make sure the camshaft lobe is pointing upward.
  10.  
  11. Coat the valve, camshaft and HVA adjuster with fresh engine oil.
  12.  
  13. Press the valve down using tool No. 11 5 130 and install the rocker.
  14.  
  15. The remaining components are installed in the reverse order from which they were removed.
  16.  
  17. Check all fluid levels and top off as necessary.
  18.  
  19. Reconnect the negative battery cable.
  20.  
  21. Start the engine and inspect for any fluid leaks.
  22.  

M20 Engine

Check the rocker shafts for scoring and wear at the rocker arm pivot points. Check the shaft oiling holes for clogging and varnish. Check the bushing in the rocker arm for wear. Check the adjuster eccentric for flat spots. Check the iron pad for wear and looseness. If the iron pad is loose, it will make a ticking or tapping noise when the engine is running.


NOTE
The cylinder head must be removed before the rocker arm shafts can be removed. Support the head so it can not move around on the bench.

  1. Disconnect the negative battery cable. Remove the cylinder head.
  2.  
  3. Mount the head on a suitable holding fixture.
  4.  
  5. Remove the camshaft sprocket bolt and remove the camshaft distributor adapter and sprocket. Reinstall the adapter on the camshaft.
  6.  
  7. Adjust the valve clearance to the maximum allowable on all valves.
  8.  
  9. Remove the front and rear rocker shaft plugs and lift out the thrust plate.
  10.  
  11. Remove the spring-clips from the rocker arms by lifting them off.
  12.  
  13. Remove the exhaust side rocker arm shaft:
    1. Set the No. 6 cylinder rocker arms at the valve overlap position (rocker arms parallel), by rotating the camshaft through the firing order.
    2.  
    3. Push in on the front cylinder rocker arm and then turn the camshaft in the direction of the intake rocker shaft, using a 1 / 2 inch drive breaker bar and a deep well socket to fit over the camshaft adapter. Slide each rocker arm to one side as it develops sufficient clearance away from its actuating camshaft and the valve it actuates. Rotate the camshaft until all of the rocker arms are relaxed.
    4.  
    5. Remove the rocker arm shaft by driving it out or pulling it out.
    6.  

  14.  
  15. Remove the intake side rocker arm shaft:
    1. Turn the camshaft in the direction of the exhaust rocker arm.
    2.  
    3. Use a deep well socket and 1 / 2 inch drive breaker bar on the camshaft adapter to turn the camshaft. Slide each rocker arm to one side as it develops sufficient clearance away from its actuating camshaft and the valve it actuates. Rotate the camshaft until all of the rocker arms are relaxed.
    4.  
    5. Remove the rocker arm shaft.
    6.  

  16.  
  17. Install the rocker arm shafts by reversing the removal procedure. Keep the following points in mind:
    1. The large oil bores in the rocker shafts must be installed downward, toward the valve guides and the small oil bores and grooves for the guide plate face inward toward the center of the head.
    2.  
    3. The straight sections of the spring clamps must fit into the grooves in the rocker arm shafts.
    4.  
    5. The guide plate must fit into the grooves in the rocker arm shafts.
    6.  
    7. Adjust the valve clearance.
    8.  

  18.  

M44 Engine

NOTE
The Hydraulic Valve Adjuster (HVA) can be replaced once the rocker is removed.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the valve (cylinder head) cover.
  4.  
  5. Remove the spark plugs.
  6.  
  7. Remove the engine cooling fan as outlined in this section.
  8.  
  9. To remove a rocker, rotate the engine until the lobe of the camshaft for the rocker to be removed is pointing up.
  10.  
  11. Insert Tool No. 11 5 130 or equivalent between the camshaft and the valve, then press the valve down and remove the rocker.
  12.  



Click image to see an enlarged view

Fig. Tool No. 11 5 130 or its equivalent is used to depress the valve and valve spring, allowing the rocker to be removed



Click image to see an enlarged view

Fig. The rockers must be installed in the exact position from which they were removed. Note how the rocker has a slight bend away from the camshaft journal-M44 engine



Click image to see an enlarged view

Fig. The rocker rests on the hydraulic adjuster and the valve. The camshaft lobe contacts the roller portion of the rocker



Click image to see an enlarged view

Fig. The rockers have a slight bend and must be reinstalled in their exact order

To install:

  1. Make sure the camshaft lobe is pointing upward.
  2.  
  3. Coat the valve, camshaft and HVA adjuster with fresh engine oil.
  4.  
  5. Press the valve down using tool No. 11 5 130 or equivalent, then install the rocker.
  6.  
  7. The remaining components are installed in the reverse order from which they were removed.
  8.  
  9. Check all fluid levels and top off as necessary.
  10.  
  11. Reconnect the negative battery cable.
  12.  
  13. Start the engine and inspect for any fluid leaks.
  14.  

N52 Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:
    NOTE
    The rockers must be installed in the exact position from which they were removed. Do not mix up the shafts.



    Negative battery cable
     
    Cylinder head
     
    Intermediate lever
     
    Exhaust camshaft
     
    Rocker shaft
     
    Roller cam from HVC element
     
    HVC element To install:
     

  4.  
  5. Before installing exhaust camshaft and intermediate lever, make sure roller cam followers are correctly seated.
  6.  
  7. Installation is the reverse of removal.
  8.  

N62 Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:
    WARNING
    Rotate the camshaft so that when the bearing bracket is removed the intermediate levers do not slip out and damage the camshaft.



    Negative battery cable
     
    Eccentric shaft servomotor
     
    Ignition coils
     
    Spark plugs
     
    Inlet and exhaust adjustment units
     
    Cylinder head cover
     

  4.  
  5. If working on the left inlet side, rotate intake camshaft against the direction of rotation until the lettering on the camshaft at cylinder 8 points upwards and the camshaft lobe is horizontal. For the right inlet side, rotate the camshaft in the direction of rotation until camshaft lobe for cylinder one is horizontal pointing away from the rockers.
  6.  
  7. Rotate the eccentric shaft at the dihedral head in order to reduce tension on torsion spring. Pull on the torsion spring with a strap and feed it out from the roller.
  8.  
  9. Rotate the eccentric shaft back to the minimum stroke position.
  10.  
  11. Remove the bearing cap marked R E1 (for the left inlet side) or L E1 (for the right inlet side). Do not mix up the camshaft bearing covers.
  12.  
  13. Remove the eight nuts securing the bearing bracket assembly. Start from the outside and work to the inside.
  14.  
  15. Clamp special tool No. 11 9 470 in a vice. This will support the bearing bracket assembly.
  16.  
  17. Carefully lift out the bearing bracket assembly. Do not tilt the bracket; secure it to the tool with a nut.
  18.  
  19. Remove the rocker arms. Do not mix them up; they must be returned to their original positions.
  20.  

To install:

  1. Installation is the reverse of the removal procedure, while using the following torque values:

    M6 fasteners: 88 inch lbs. (10 Nm)
     
    M7 fasteners: 10 ft. lbs. (15 Nm)
     
    M8 fasteners: 15 ft. lbs. (20 Nm)
     

  2.  

S54 Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:
    NOTE
    The rockers must be installed in the exact position from which they were removed. Do not mix up the shafts. The intake shaft is marked with a groove between cylinders 5 and 6.



    Negative battery cable
     
    Cylinder head
     
    Raise rocker arms and remove adjustment plates; keep aside in order
     
    Spring clip
     
    Camshaft sensor
     
    Rocker shaft securing screw
     
    Rocker shaft To install:
     

  4.  
  5. Installation is the reverse of removal.
  6.  

 
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