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Thread: 1972 BMW R75/5 - Rear Drive Shaft Boot Shavings?

  1. #1
    Registered User b25bsaboy's Avatar
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    1972 BMW R75/5 - Rear Drive Shaft Boot Shavings?

    Good morning to you all,

    Yesterday I cleaned up the rear swing arm area and removed the transmission drive shaft transition boot, turned it inside out and discovered the following fillings. Where would have this come from?
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    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 73 R75/5 SWB, 2008 Honda GL-1800 Lehman Trike

  2. #2
    Liaison 20774's Avatar
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    Could they be broken washers? From the factory they would have used long bolts with washers. They could break and the bolts would loosen creating havoc. Replacement bolts are shorter with no washer.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    Are the pieces steel or aluminum? Looks like aluminum to me.

  4. #4
    Registered User b25bsaboy's Avatar
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    Quote Originally Posted by poorub View Post
    Are the pieces steel or aluminum? Looks like aluminum to me.
    Good Question! Will check.
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 73 R75/5 SWB, 2008 Honda GL-1800 Lehman Trike

  5. #5
    Nick Kennedy
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    Wherever it came from it can't be good.
    Hope you find the source and its a easy fix.

  6. #6
    John D'oh
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    Those are aluminum threads from one or more shaft housing fill/drain plug holes in the final drive...
    John D'oh

  7. #7
    Registered User lmo1131's Avatar
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    Those are aluminum threads from one or more shaft housing fill/drain plug holes in the final drive...
    If they ARE aluminum (looks like it), that's about the only thing I can think of too.

    Keensert time...
    "It is what you discover, after you know it all, that counts." _ John Wooden
    Lew Morris
    1973 R75/5 - original owner
    1963 Dnepr

  8. #8
    #4869 DennisDarrow's Avatar
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    Definitely threads; but from where and how did they end up where they did....Is it making any shouldn't be making noises....Grinding???

  9. #9
    Registered User PAS's Avatar
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    The rotation of the driveshaft pulls gear oil forward towards the gearbox.

  10. #10
    John D'oh
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    Quote Originally Posted by PAS View Post
    The rotation of the driveshaft pulls gear oil forward towards the gearbox.
    - what PAS said. I would add that the oil moving towards the gear box washes through the bearings in the "U-joint" from centrifugal force carrying any odd debris with it of course - which is how the bits wound up in the boot.

    Check the fill drain plugs on the final drive. Specifically, the threaded holes one near the stamped numbers representing the gear ratio - and the one below it. You will either see threads or no threads. Possibly, a thread insert repair. Those are the fill and drain holes for the steel drive shaft housing. The actual final drive drain is on the housing bottom at 6:00 and the fill hole is at the rear of the housing at about 9:00. If you find nice clean original threads I'd bet the bits are from an earlier final drive unit. The plugs only need a few ft lbs of torque on new washers to stay put.
    John D'oh

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