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Thread: Oil Seepage Front of Motor

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  1. #1
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    Mar 2011
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    Oil Seepage Front of Motor

    I have a 94 R1100RS and have found there is a collection of oil seepage in the front of the motor towards the front of the oil pan. See attached image and section in Yellow.

    What might be causing this seepage?

    Thanks
    Attached Images Attached Images

  2. #2
    wvrocks
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    Is there any oil on the timing belt cover above the area you have marked? If yes, it could be the front crankshaft seal behind the Hall Sensor plate or, if equipped, the seals for the rotary breather vent tube. If its lower it could be that the timing chest/alternator support sealant has deteriorated and is leaking. Leaking head gaskets or oil sight glass could be a possibility too.

    Clean it up, dust it with some baby powder, ride and then check for the source

  3. #3
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    Quote Originally Posted by wvrocks View Post
    Is there any oil on the timing belt cover above the area you have marked? If yes, it could be the front crankshaft seal behind the Hall Sensor plate or, if equipped, the seals for the rotary breather vent tube. If its lower it could be that the timing chest/alternator support sealant has deteriorated and is leaking. Leaking head gaskets or oil sight glass could be a possibility too.

    Clean it up, dust it with some baby powder, ride and then check for the source
    Definately not on the timing belt cover, around the site glass or the head gaskets.

  4. #4
    wvrocks
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    There is a very thin layer of sealant between the timing chest cover and the engine block. I guess its possible that it could have sprung a leak at some point. Its not a lot of fun to take off everything needed to make the repair but its doable. Assuming of course that's the problem. The engine halves are sealed the same way.

    There's a lot of air movement in that area so make sure its not running or blowing there from somewhere else.

  5. #5
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    3 levels of oil exiting its preferred location:
    weepage, seepage and leakage, in progressive order of severity.
    which would you call it?
    weepage- don't worry. it takes a long time to accumulate, and by the time you find it, its just sooty looking, never really wet. takes many thousands of miles before you can really even see it.
    seepage- don't worry too much, but keep an eye on it. might be barely damp with oil, takes a few thousand miles to accumulate an amount worth noticing.
    leakage- fix it, probably sooner than later. wet, all the time. leaves puddles under the bike. size of puddle tells you how soon it needs fixing.
    Ride Safe, Ride Lots

  6. #6
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    Quote Originally Posted by bikerfish1100 View Post
    3 levels of oil exiting its preferred location:
    weepage, seepage and leakage, in progressive order of severity.
    which would you call it?
    weepage- don't worry. it takes a long time to accumulate, and by the time you find it, its just sooty looking, never really wet. takes many thousands of miles before you can really even see it.
    seepage- don't worry too much, but keep an eye on it. might be barely damp with oil, takes a few thousand miles to accumulate an amount worth noticing.
    leakage- fix it, probably sooner than later. wet, all the time. leaves puddles under the bike. size of puddle tells you how soon it needs fixing.
    I think it falls somewhere between seepage and leakage. No drips on the floor at all. After cleaning it up and taking a 100 mile it reappears.

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