Driveshaft oil migration

Discussion in 'Airheads' started by hardwaregrrl, Jun 17, 2017.

  1. hardwaregrrl

    hardwaregrrl ignore list

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    Not sure what the current travel ban is on german produced hypoid....but it's running all over the damn place! Leak seems to be originating from FD to driveshaft area. For giggles I replaced crush washers on fill/drain plugs. Been up since 3am and hamster wheel brain is turning. I don't have time to tear into it right now, but wondering if I can get some strategies. Besides separating them, where should I focus my attention?

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    #1
  2. atlthrux

    atlthrux Been here awhile

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    Is the oil only on the inside/left-side of the junction, or is it on all edges, including the bottom?
    Is it dripping onto the floor? What tipped you off?

    #2
  3. Jim K in PA

    Jim K in PA Long timer

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    Are you sure it's from the DS? Could it be from the shock? It's oily forward and above where I would expect it to be if the gasket were leaking.
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  4. hardwaregrrl

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    Nope it's from the driveshaft to FD junction. Shock is fine, recently rebuilt. I cleaned it up well and hit it with baby powder. I noticed it because it was pooling on the rim. It leaks over time whether sitting or being ridden.
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  5. hardwaregrrl

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    I was unclear and took another look. There is oil coating the top of the junction where the fill for the DS is, the sides and the bottom and it's running down the fins of the FD and dripping off the bottom f it. It's 100% at the junction. Lots of thoughts, little memory. I think I had a nos paper gasket and installed it. But I didn't use a hylomar or the like. Drained the DS and it's where it should be, 150cc. I just want to be sure oil from the FD cannot migrate upstream.

    And question of the day....what are the min and max marks on the FD for?? Oil level or brake adjustment?
    #5
  6. Warin

    Warin Retired

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    There is a rotary seal in there. Does not take much to make a mess, so tracking levels will be difficult.

    I'd think it is the paper seal from swing arm to FD. 5 bolts (shock is 1, 4 on the actual joint) and it is off, sliastic both sides of the joint and you can stop worrying about that. You can even leave the paper out (if you tare it), just silastic.

    Brake shoe ware. I ignore it, I check it when I have the wheel off - I like to see what I am doing mechanically.
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  7. disston

    disston ShadeTreeExpert

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    You're supposed to change the washers every time you remove and replace the fill and drain plugs. Failure to do this will not only cause oil to leak but can lead to stripped threads that are difficult to Heli Coil. It's difficult to get the new thread in straight so the plug will seal as it should instead of being just a tiny bit crooked and then it leaks. (don't ask why I know this)

    I got tired of running out of new washers so ordered them in voluum from an aftermarket source. Just had to come up with sizes of the plugs and add 2 mm for the super dimension (I think it was 2 for the outer edge?). I actually got copper washers which I think are better than the aluminum ones BMW sells. Copper is more expensive but still less than OEM when ordered in bulk.

    Sorry I don't remember where I ordered these. When I was shopping there were a bunch of places that had deals on them.
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  8. hardwaregrrl

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    Thanks guys......I guess I'll pull it and reseal. So it is possible to receive oil from the FD. Charlie, yeah I've had that problem too with the DS fill plug. So I always replace them with the oil.
    #8
  9. 190e

    190e Long timer

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    Oil can migrate internally between drive shaft and final drive. Mine used to go in the direction of the final drive but that was cured by putting a little less in the drive shaft. Neither the drive shaft or final drive are particularly critical on oil level so running them a touch lower is not a problem. They definitely should not be overfilled. Gearbox oil level is different and should be done with some care.
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  10. boxermoose

    boxermoose Regressive airhead

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    Double check it's not a blown shock seal misting oil on it
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  11. hardwaregrrl

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    Moose....it has been negated from the list. I think I'm at the top of that list....the shit list. I pulled the FD and mom brain was way off....nothing on the FD....nothing on the DS. I am an asshole.
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  12. Warin

    Warin Retired

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    A problem found is a problem fixed. :thumb
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  13. boxermoose

    boxermoose Regressive airhead

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    D'oooooh....reading is hard
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  14. hardwaregrrl

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    This true but it's disparaging thinking at 44 years old I'd have a better grasp of assembling the things I love to trash. What else did I forget???? Thanks for amusing me and looking out.
    #14
  15. JimGregory

    JimGregory Long timer

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    What just happened?
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  16. globalt38

    globalt38 "A Fist Full of Throttle"

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    Same boat - did I miss it? What was the problem and how was it fixed? :scratch:D
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  17. Jim K in PA

    Jim K in PA Long timer

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    <she forgot the gasket> :hide
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  18. globalt38

    globalt38 "A Fist Full of Throttle"

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    Ahhh - got it! I, for some reason, equated "nothing on" as "nothing wrong" :augie
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  19. hardwaregrrl

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    You have met me......right?:1drink
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  20. Warin

    Warin Retired

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    Most people don't do all things well, particularly all the time. Gota live with that, concentrating on things when they count helps.
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