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Thread: weeping coolant on 85 k100 rs - ???

  1. #1
    what would Joan Jett Do? 110066's Avatar
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    weeping coolant on 85 k100 rs - ???

    what causes coolant to weep out of the little weep hole on the pump?

    background:

    I just recently changed the oil and I ran a sludge remover (automotive snake oil???) thru the crank case.

    I also recently had the tank off to replace the clutch cable and while it was off - I did top off the coolant a bit (bad idea???)

    I was reading the manual which states that the oil pump and the coolant pump are in fact the same pump - Now I am having visions of a crank case full of antifreeze (is the possible)

    The stuff looks to be only coolant - but I hadn't really thought to look for oil being in there until I read the part about the oil/water pump

    Anyone with any advice/past experience?
    I am going back to the garage for further research

    thanks in advance for the help

  2. #2
    Registered User
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    The seal on the waterpump is going bad. JON

  3. #3
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    I had some drips on my garage floor of coolant.

    Then I torqued the bolts back to spec and it stopped.

  4. #4
    I am here to serve you. hankb's Avatar
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    What the other guys said is true and I'd like to add the following:

    The water pump and oil pump share the same shaft. Between the two pumps, each has its own seal and there is a small space between them that drains at the front of the oil pan. As long as any coolant/oil that leaks in this space can get out, they will not mix there.

    I doubt that anything you did caused this. My bike started doing this shortly after I got it ('95 K75RT with 37K on it at the time.) I replaced the seals and have had no leaks since. On an older bike, it might be better to replace the water/oil pump.

    If it gets no worse, you could just live with it. I fixed it because I did not know how fast it would get worse and didn;t want to find out a long way from home. You'll find information on water/oil pump rebuild at the IBMWR site tech pages.
    Hank Barta
    K1200RS, R100R/Velorex 700
    Beautiful Sunny Winfield, IL

  5. #5
    A bozo on the bus deilenberger's Avatar
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    Originally posted by HankB
    What the other guys said is true and I'd like to add the following:

    The water pump and oil pump share the same shaft. Between the two pumps, each has its own seal and there is a small space between them that drains at the front of the oil pan. As long as any coolant/oil that leaks in this space can get out, they will not mix there.

    I doubt that anything you did caused this. My bike started doing this shortly after I got it ('95 K75RT with 37K on it at the time.) I replaced the seals and have had no leaks since. On an older bike, it might be better to replace the water/oil pump.

    If it gets no worse, you could just live with it. I fixed it because I did not know how fast it would get worse and didn;t want to find out a long way from home. You'll find information on water/oil pump rebuild at the IBMWR site tech pages.
    If you noticed the design of the water pump seal - it isn't one that is likely to fail catastropically.. it just slowly drips and may start dripping a bit faster.

    It's not a rubber lip seal - it's a rather odd ceramic/metal seal where the two sealing surfaces rub one another.

    It is something to do when you have a chance, but if one started dripping slightly when on a trip - I wouldn't panic over it.
    Don Eilenberger http://www.eilenberger.net
    Spring Lk Heights NJ NJ Shore BMW Riders New Sweden BMW Riders
    '07 R1200R (current ride) and some bimmers.. and a Porsche

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