Play in drive shaft U joint

Discussion in 'Airheads' started by SamH, Apr 22, 2013.

  1. SamH

    SamH 90S on the bench

    Joined:
    Aug 14, 2005
    Oddometer:
    436
    Location:
    Tasmania, Australia
    Hi all

    I've got a couple of drive shafts for the 90S that I'm putting together but I suspect they're both stuffed.
    How much, if any, side to side play is acceptable in the U joint? One has far more play than the other but... I dunno.
    #1
  2. ME 109

    ME 109 Long timer

    Joined:
    Jun 25, 2009
    Oddometer:
    4,791
    Location:
    Albury Australia
    The universal joint itself should have zero play.
    #2
  3. SamH

    SamH 90S on the bench

    Joined:
    Aug 14, 2005
    Oddometer:
    436
    Location:
    Tasmania, Australia
    Figured :puke1

    Munich sell the serviceable universals as a part, who would be able to install that?
    #3
  4. ME 109

    ME 109 Long timer

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    I replaced my uni joint about 15 years ago with a Hardy Spicer part.
    I can't remember the part number, and my bike is a 81 R100 RS so a different part to yours no doubt.
    Easy to cross reference once you have measured cap diametre and cross dimension.

    Is your uni peened in place?
    I used a steel washer over each cap. The washer was a perfect fit diametre, and also sat perfectly flush with the outside of the yokes, so centreing the new uni was easy.

    Two quick hits of mig per washer.
    That was a lot of years, and abuse ago.
    #4
  5. SamH

    SamH 90S on the bench

    Joined:
    Aug 14, 2005
    Oddometer:
    436
    Location:
    Tasmania, Australia
    Hmmm, might look into that. I've got two to mess around with so (famous last words) how hard could it be!?
    #5
  6. RecycledRS

    RecycledRS Along for the ride

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    This would be great tip if you could remember the number of the part you used 109.
    #6
  7. Solo Lobo

    Solo Lobo airhead or nothing

    Joined:
    Mar 16, 2004
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    9,665
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    HPMGuy can replace u-joints with circlipped replaceable ones... he did on the drive shaft for my R80G/S
    #7
  8. ME 109

    ME 109 Long timer

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    Oddometer:
    4,791
    Location:
    Albury Australia
    It may be written somewhere in my BMW 27 volume workshop manual. (sorta fell apart over the years, the manuals more rooted than the bike)

    But regardless of what I may or may not have written, as soon as your uni is on the bench in front of you, you will have your sizes and that is as good as a part number.
    Just a standard universal joint. Even comes with a grease nipple but I think I took mine out. Sure as hell never greased it!
    Don't even need to take the uni out of the shaft to measure and could be done in the bike prolly.





    Oh yeah, there's a little peening to help keep the lid on things.
    Edit, that's 100,000 k + repair.


    [​IMG]
    #8