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  1. #1

    40 hp Yamaha oil slick

    Seems some type of petro product finding it's way out the exhaust Either oil or fuel. How to troubleshoot?
    Mark
    1981 56' MY Hull #320
    "Lady Ann"

  2. #2

    Re: 40 hp Yamaha oil slick

    2 stroke, 4 stroke? How does it run at idle and at speed?
    Pascal
    Miami, FL
    1970 53 MY #325 Cummins 6CTAs
    2014 26' gaff rigged sloop
    2007 Sandbarhopper 13
    12' Westphal Cat boat

  3. #3

    Re: 40 hp Yamaha oil slick

    4 stroke. Starts quickly, runs well at idle, and all the way through to WOT. When shut down, as the remaining water drips from the exhaust, it creates a slick about 20 feet in diameter.
    Mark
    1981 56' MY Hull #320
    "Lady Ann"

  4. #4

    Re: 40 hp Yamaha oil slick

    I can’t how gas would leak in exhaust after shut down. I wonder if some gearcase oil could find its way in the cooling water? Have you checked engine oil level?
    Pascal
    Miami, FL
    1970 53 MY #325 Cummins 6CTAs
    2014 26' gaff rigged sloop
    2007 Sandbarhopper 13
    12' Westphal Cat boat

  5. #5

    Re: 40 hp Yamaha oil slick

    Will do
    Mark
    1981 56' MY Hull #320
    "Lady Ann"

  6. Re: 40 hp Yamaha oil slick

    It is most likely that the prop shaft seals are leaking. The seals are behind the propeller in the bearing cage. On a Mercury, you need a special tool to get to the bearing cage off to replace the seals. Not sure if it is the same on a Yamaha but likely so. It can be a bugger to get the bearing carrier apart. The right tools and some heat helps!
    SCUSI
    1981 55C
    Hull #: 328

  7. #7

    Re: 40 hp Yamaha oil slick

    Okay, I'll find an exploded parts diagram to see what these are and where they live
    Mark
    1981 56' MY Hull #320
    "Lady Ann"

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