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Thread: Oil on my shoe

  1. #1
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    Oil on my shoe

    Late in the riding season (yes I'm one of those weenies who puts his bike away for the winter) I developed an oil leak. 93R100RT, 57K+/-miles.
    My left boot would wind up covered with oil. Not alot but enough of a film to be concerned as this is a new development in an otherwise oil drip free bike. Bottom of the carburetor bowl is oily. Not sure if oil is leaking out of small vacuum(?) hose on bottom or elsewhere.
    I'm planning my winter projects and this will be one. I can turn a wrench but I'm no mechanic and diagnostics is not mt strong suit.
    Helpful suggestions welcomed.
    Thanks
    Paul

  2. #2
    Registered User gertiektn's Avatar
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    Inspect.

    I would suggest you lay on the shop floor an peer upward to see if you can trace the source of the leak.. It will most likely be self evident.
    bottom of the valve covers, or push rod tubes, etc.

    This simple observation will give you are start in the right direction.

    Jim Dahl, Ketchikan, AK
    I like good stuff. No Chains here!
    1960 R50 -"Hanz"
    1977 R75/7 -"Gertie"
    2004 R1100s -"RFAR1"

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    It could well be that the oil pressure sensor is cracked and leaking oil as you ride - the airflow will blow the oil back along the lower frame tube and your left boot , usually. But, check carefully because it might be a leak form elsewhere.
    BMWs in my garage: 1982 R65LS, 1978 R100/7

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    are you certain that it is not gasoline leaking from the float bowl? that is a much more lkely occurrence.
    Ride Safe, Ride Lots

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    It is definitely oil and not gas. Have felt and smelled it
    There is only minor weapage from the pushrods, nothing that even drips, just enough to attract grime.
    I have laid on the floor under it and it appears to be emanating from the hose that attaches to the bottom of the carb, but that seems odd. Is that hose part of the blow by for pollution or connected to that somehow?

  6. #6
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    iirc, the pollution control system connects between the cylinder exhaust port and the air intake box. carb does not have a source of oil associated with it (unless you are blowing massive amounts of oil back into the carb thru the air filter, but that would be really weird/unusual).
    Ride Safe, Ride Lots

  7. #7
    Registered User mneblett's Avatar
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    Quote Originally Posted by AirHdPaul View Post
    I have laid on the floor under it and it appears to be emanating from the hose that attaches to the bottom of the carb, but that seems odd. Is that hose part of the blow by for pollution or connected to that somehow?
    The crankcase breather dumps oil fumes into the left and right carb intake tubes at the airbox. If the amount of oil fume flow is high, the oil can condense along the bottom of the tube/carb floor and weep out, usually at the tube/carb body joint -- often observed dripping from the hose clamp right over your boot toe.
    Mark Neblett
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  8. #8
    advrider.com
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    Quote Originally Posted by boxermaf View Post
    It could well be that the oil pressure sensor is cracked and leaking oil as you ride - the airflow will blow the oil back along the lower frame tube and your left boot , usually.
    ..and this is what it looks like.



    ..but it never makes it to the bottom of the carb.

  9. #9
    Registered User donbmw's Avatar
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    Looking at the picture I have had the following items seep oil, timing chain cover, cylinder base gaskets, pushrod seals, and oil pressure switch. Oil pressure switch needs to be check with engine running. My guess is the pressure switch.

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    Quote Originally Posted by donbmw View Post
    Looking at the picture I have had the following items seep oil, timing chain cover, cylinder base gaskets, pushrod seals, and oil pressure switch. Oil pressure switch needs to be check with engine running. My guess is the pressure switch.
    in the case of the picture, yeah, i'd go with the pressure switch as the worst culprit, but he probably has accomplices.
    however- that pic is NOT of the bike in question. any pics of the OP's machine are yet to be posted.
    Ride Safe, Ride Lots

  11. #11
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    Thanks everybody for all your input.
    I will get back on the floor under the bike and take a look past the obvious.
    I'm willing to bet one of things mentioned here is probably gonna be it.
    Have the bike in a home far from where I am currently residing and will be a couple weeks before I get to it but thank you all for the advice.
    Paul

  12. #12
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    Quote Originally Posted by bikerfish1100 View Post
    however- that pic is NOT of the bike in question. any pics of the OP's machine are yet to be posted.
    Yes, that picture is not from the OP. I was demonstrating what a leaking pressure switch looks like.. and ruling it out for anyone who's never seen/experienced it.

  13. #13
    Registered User lmo1131's Avatar
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    "Covered in oil"? (versus a few spots) sounds like more than an oil pressure sensor, or the crankcase vent weeping a few drops. Base gasket? Push rod tube seals?

    Regardless, I'd suggest a shot of engine de-greaser, and a quick pressure wash at the local car wash. It's usually easier to spot where something is coming from when you don't have to see through what's already there.
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

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