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  1. #1
    MikeD528i
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    What are the signs of a bad flywheel?

    I just want to know if these symptoms match to a flywheel problem:

    -at IMMEDIATE startup only there is a definite rumble in the car and whirring sound that goes away almost a second later

    -at 1500 RPM EXACTLY either at a stop (in neutral revving the gas while holding the engine at 1500)
    or
    engaging first from a stop then pulling away the shifter vibrates enough to notice only as it passes from idle speed (no vibration yet)thru 1500 (vibration here) then above (no further vibration on)

    -no noticeable vibration at any other RPM (higher or lower than 1500)

    -just had a clutch job and tech said flywheel wasn't in 100% Excellent condition as it needed some surfacing but I'm concerned the clutch and flywheel aren't interacting properly because the flywheel developed a rough surface from shot clutch before

    -belts and fan look fine


  2. #2
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    Re: What are the signs of a bad flywheel?

    Check your tranny mounts. If your mechanic just sanded the flywheel, that didnt do anything. IF he had it resurfaced, then the place has to resurface 2 surfaces on the flywheel. If they only did one surface, that could lead to your clutch not resting properly against the flywheel, hence the vibration.




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  3. #3
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    When it rips through the floorboard in pieces

    I've seen it happen before...Sure sign of a bad flywheel.

    Michael

  4. #4
    edjack
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    Good Rule of Thumb!


  5. #5
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    LOL! Did that car after UD pulleys on it? :)




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  6. #6
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    No it was all that Dinan stuff



    Jim Lev
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  7. #7
    Bernie-MI
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    Have some thoughts for you,,,,,,,

    The whirling sound at startup is most likely the starter being disengaged from the flywheel, it may by hanging-up momentenarily after engine starts, ie, starter pinion or shaft getting sticky. The tech shouldnt have pulled the starter when doing the clutch.

    Was the dual mass flywheel taken off the crank for any reason?? Their real sensitive to their mounting surface on the end of the crank. Do you get clutch"chatter" upon starting from a dead stop? A poor friction surface will develop chatter with a new disc. Dual mass flywheels can be resurfaced by a GOOD machine shop, both the disc surface and the pressure plate surface to be done to maintain same relationship of pressure plate to disc. I've done this many times, and balence does not seem to be affected.

    Check you motor mounts, especially the right side. It takes all the engine torque. Usually the rubber breaks loose inside the mounting "cup" and the motor lifts up when engaging the clutch from a dead stop. Shine a flashlight down from the top and look for any signs of possible rubber seperation at the mount. If it looks questionable, then change it, it will usually fall apart soon as its taken out. Check the trans mounts also, they either break loose or get so hard and become usless.

    I'm assuming you replaced the pressure plate??

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