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Thread: Oily Exhaust

  1. #1
    Join Date
    Jul 2007
    Location
    Chesterland, OH, USA
    Posts
    11

    Default "I have oily exhaust on my st

    "I have oily exhaust on my starbord Model #350, exhaust, I don't think it's fuel I just had the carbs rebuilt. I'm beging to think it's coolant (closed cooling) Anyone have some suggestions on where to go next. Thanks"

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    6,823

    Default "you can pressure test the clo

    "you can pressure test the closed cooling loop just like any auto radiator.

    check you gear and engine for water in the lube oil (via dipsticks) - elevated (overfull) levels indicate water, usually. This is most likely due to a leaking oil cooler. (excessive 'condensation' inside the oil fill cap is another indicator.)

    Both gear and engine lube pressures in the coolers exceed the raw water pressure -> if there's a leak, the oils go into the cooling water and wind up in the exhaust. Once shut off, the pressures subside and between gravity and drain back of the oils, the water enters. This is something that you want to resolve immediately."

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