BMW Cars 1999-06

Flywheel

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Flywheel Inspection




NOTE
Inspect the rear main/flywheel seal for leakage when inspecting the flywheel. Replace as necessary. Refer to Section 3 for replacement procedures.

Dual Mass Flywheels

A viscous coupling dual mass flywheel was installed on the E36 models to reduce the noise created by gear box chatter when the vehicle is idling in neutral. The viscous coupling of the flywheel can be checked with the pressure plate installed or removed, however when installed, the pressure plate offers a good surface to hold onto.

To check the viscous coupling proceed as follows.


CAUTION
The clutch disk contains asbestos, which causes some forms of lung disease and may be a cancer causing agent. Do not clean the clutch or housing with compressed air. Use a damp rag to wipe off surfaces and throw away the rag. Use commercial available brake cleaners if a solvent is necessary. Avoid inhaling any dust from the clutch surfaces.

  1. Place a protective cloth over the pressure plate, grasp and rotate the pressure plate in a clockwise direction until the flywheel barely begins to move.
  2.  
  3. Matchmark the pressure plate and the outer body of the flywheel.
  4.  
  5. Grasp and rotate the pressure plate in a counterclockwise direction until the flywheel barely begins to move.
  6.  
  7. Matchmark the pressure plate and the outer body of the flywheel.
  8.  
  9. The pressure plate should be able to be moved between the two matchmarks without excessive force or looseness.
  10.  



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Fig. The flywheel is moved clockwise and matchmarked



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Fig. Then the flywheel is moved counterclockwise and matchmarked again to determine the range of movement. It should move between these two points, without binding or looseness

Surface Inspection

NOTE
For flywheel removal and installation procedures, please refer to Section 3.

The flywheel should be inspected for:



Ring gear damage
 
Fluid contamination
 
Warpage flatness and thickness variations
 
If equipped, speed and reference sensor damage
 
Surface irregularities, such as scoring, cracking, and signs of overheating
 

If a flywheel's clutch surface shows signs of deterioration or wear it should be replaced. Possible symptoms of an improper flywheel clutch surface include clutch chatter during engagement and disengagement, poor shifting qualities or grabbing.

If the rear main/flywheel seal is leaking, or the flywheel needs to be replaced, it should be replaced at this time as outlined in Section 3. An oil saturated clutch disk can cause clutch slippage, burning odors and poor disengagement and engagement qualities.



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Fig. The surface irregularities of this flywheel shows signs of constant overheating of its surface and should be replaced



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Fig. Although this flywheel shows signs of a significant amount of use, the surface wear is relatively uniform and could be reused



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Fig. A flywheel can be checked for flatness using a precision straight edge and a 0.004 inch (0.10mm) feeler gauge

 
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