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    Trans noise

    After about 750 trouble free miles, my swapped E30 suddenly developed an ugly transmission noise. The trans is a ZF out of a 98 M3. I installed a ltw flywheel kit (Fidenza) from BavAuto, it included a new clutch, pressure plate, T.O. bearing.

    I thought it was a bad throwout bearing & I still hope that is the case. If I understand the T.O. bearing diagnosis correctly, the noise should go away when the pedal is depressed. However, my trans makes noise when the clutch is out. I dont know how to describe the noise, it's sort of a grind/rattle. I can hear it the instant I engage the starter. If I let the car idle in neutral, it really makes a racket. When I push in the clutch the noise is almost completely silenced. I can just barely feel it in the shifter.

    It seems like the problem developed in an instant. I had driven the car earlier in the day and everything was fine. I got in to head home and the noise was so bad I had it towed instead. I'm going to pull the transmission soon. Is a bad throwout bearing fairly obvious?

    Thanks in advance for any troubleshooting help you can offer.

    #2
    If the noise is only present when the transmission is in neutral and the clutch is engaged, it may be input shaft rattle. Which is frequently a side affect of a lightweight flywheel. Before pulling the transmission I'd suggest having an experienced BMW tech listen to the noise.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

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      #3
      Would the fact that the noise began suddenly indicate a component failure or impending component failure?

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        #4
        If it is input shaft rattle, it probably isn't a sign of impending failure. But there are other possibilities, which is why I suggest getting an expert opinion.
        The car makes it possible, but the driver makes it happen.
        Jim Levie, Huntsville, AL

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          #5
          Generally speaking, is this the sort of thing I can limp to my local indie shop? it's about 5 miles away. Or should I see If the tech I know would stop by after work?

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            #6
            It is impossible to judge that without hearing the noise. The safe bet would be to have the car towed to a shop or have the tech go to the car.
            The car makes it possible, but the driver makes it happen.
            Jim Levie, Huntsville, AL

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