At wits end with driveshaft and vibration

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  • Flash
    Mod Crazy
    • Dec 2007
    • 687

    #1

    At wits end with driveshaft and vibration

    Well this is more of a rant, bad things only seem to happen to me for some reason :(

    About a week ago my CSB separated from the main rubber, i do drive the car pretty hard, nothing abusive like a clutch dump but a lot of hard launches and i know that wears it prematurely....that said....

    Ive done the job about a dozen times before, my car, previous car, and others as a job so i know how to do it right;learned everything i know from veterans so its not like its something you can overlook.
    So i lower the exhaust, undo the 3 bolts and nuts to the guibo/driveshaft, the 4 on the diff input flange, then the center support and drop the whole driveshaft out.
    I use a puller to remove the CSB like normal, put the other one on, now bear in mind the dust shield is missing but it has never been on, so im pretty much going to rule that out as the issue; put a new CSB on (meyle like the last) and put the driveshaft back together. It could not be put on incorrectly since its a rebuilt and sericable driveshaft with arrows indictating lineup (again id like to think im a pro at doing this since ive R&R'd many driveshafts over the past few years) and ive always paid attention to that, even marked it myself before i saw the arrows on the other side.

    So i put the driveshaft on, preload the CSB like i always have, tigthen down the clamping sleeve, all hardware torqued down properly...but then it vibrates hard from 4-15 MPH, and i can feel it in the CSB area of the tunnel.

    It really pisses me off because this kind of stuff always happens to me, my only other explanation is that i drove the car about 100 miles with a ripped CSB and it destroyed the u joint, when i had the driveshaft off it was like the rear one, tight with no play like it was when it was new. Other than those MPH it vibrates at, its fine.

    Any insight would be appreciated, im at a loss for what could be wrong, i did everything right AGAIN and dont know what im going to do. I simply dont have the time or money to be throwing at this stuff anymore :???:

    Thanks
  • Knockenwelle
    Grease Monkey
    • Jul 2008
    • 395

    #2
    Center U-joint may have been damaged during pressing (brinelled) depending on how you supported the shaft. Maybe a faulty CSB?
    sigpic

    Mike

    '91 325i track car. Mostly...

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    • jlevie
      R3V OG
      • Nov 2006
      • 13530

      #3
      A failure of the rubber mount of the CSB is almost always the result of binding u-joints in the drive shaft. You can replace just the CSB, but it will have a short life and you may have vibrations until you replace the drive shaft.
      The car makes it possible, but the driver makes it happen.
      Jim Levie, Huntsville, AL

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      • JGood
        R3V OG
        • Jan 2004
        • 7959

        #4
        Like jlevie said, it sounds like you have bad u-joints.
        85 325e m60b44 6 speed / 89 535i
        e30 restoration and V8 swap
        24 Hours of Lemons e30 build

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