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  1. #1
    simmy's Avatar
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    polaris msx 150 oil in water system!!

    hi,i have run my msx 150 on sunday for the 1st time since i bought the craft,,
    still getting oil in the closed loop cooling system [header tank]sludggy
    just serviced my self oil + filter,
    any ideas before i start stripping,,
    simmy


  2. #2

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    I believe there are only three places where oil and anti-freeze (from the closed loop cooling system) could come in contact. 1. Is the oil cooler under the inter-cooler, 2. The water pump shaft seal, and 3. the head gasket.

    A bad head gasket could be checked by doing a compression test. The water pump shaft seal would require pulling the water pump/front cover. An oil cooler inspection, I have no idea. Perhaps, some kind of pressure test on the oil side (?) could be performed w/o removing it.

  3. #3
    simmy's Avatar
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    hi thanks for the great advice,
    ill get a compression test 1st,
    a couple of guys on the lake mentioned turbo?
    but the ski is running fine,no warning lights,full rpm,no smoke,
    not over heating,

  4. #4
    slothman's Avatar
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    Is there visible oil inside the coolant tank resevoir (pink fluid)? When you pull the oil dipstick, does the oil look "milky" ?

  5. #5
    simmy's Avatar
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    hi,no the oil is golden and clean,
    there is visible oil sludggy floating on top of the pink coolant,
    i sucked the oil out of the coolant tank,give the ski a run and it
    returned,do i need to run the ski for sometime to see if i loose
    oil from the oil tank,maybe it could be from a previous headgasket
    failiure,i have recently purchased the ski and this was my 1st run,
    could i cause damage if i keep running,

  6. #6

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    I think at this point, your best bet would be to do a compression test. You are looking for 140 +/- 14.5psi or 9.6 +/- 1 bar. If this checks out, then flush the coolant system to try and remove the oil. Then see what happens.

    Obviously, oil in the anti-freeze is not normal, so it is hard to say if continued operation would lead to damage or not. It would depend on the source, which is currently unknown. Try the two steps above. The outcome will either confirm or eliminate two possible sources.

  7. #7
    simmy's Avatar
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    ok,thats great thanks for helping,
    ill do these checks next week when
    i get access to my ski,
    ill keep you posted on the outcome,

  8. #8
    slothman's Avatar
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    I would not run the engine with oil in the coolant. The contaminated coolant may cause the engine to overheat.

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