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Thread: Bottom end oil…….& water

  1. #1
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    Default Bottom end oil…….& water

    So, a rainy day before storing it away for the winter is a great time to change the bottom end oil…..

    pulled the bottom drain screw out and I got a little water, not much more than a capful, and quite clear…pulled the top vent screw out and out came the oil….beautifully golden. Boat has sat for a week since last use.

    so….is a little water like that something that warrants a look at seals or does everybody get it ?

    Other years some of the oil has been black as midnight, but no water
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    Golden oil usually means water mixed in with the oil. If it were me, I’d get the seal replaced, and check the oil plugs for good gaskets. Replace the plug gaskets anyway…water in your lower unit is not a good thing!
    “If you’re not a Liberal by twenty, you have no heart. If you’re not a Conservative by forty, you have no brain.”
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    Rick, I think golden is clear, clean oil. Milky is oil and water mixed and something to be concerned about.

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    Looks like simply replacing the worn out gasket on the plug should do the trick.
    Next year, inspect mid summer and see if there is any water.

    Happened to me and it was a simple fix but don't know the age of your outboard.
    Does it sit in the water all summer or on a trailer?

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    Quote Originally Posted by sawbill View Post
    Rick, I think golden is clear, clean oil. Milky is oil and water mixed and something to be concerned about.
    Maybe, my lower unit oil is green(ish) I guess it depends on what you consider “golden”…
    “If you’re not a Liberal by twenty, you have no heart. If you’re not a Conservative by forty, you have no brain.”
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    Milky colored oil is an indication of water and oil mixed together and would be evident if drained immediately after use. If the motor has been stationary for a week, the water will separate from the the oil, and settle to the bottom, with a clear demarcation between water and oil.
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    Yeah - checked my leftover bottle of gear oil from last year and it’s the same colour, boat sits on a trailer all year

    As suggested I’m just going to replace the seals on the vent and drain ports, and check mid-season next year

    I don’t think a capful is anything to get too worried about
    “You have enemies ? Good. It means you have stood up for something, sometime in your life”: Winston Churchill

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    Quote Originally Posted by 73hunter View Post
    Yeah - checked my leftover bottle of gear oil from last year and it’s the same colour, boat sits on a trailer all year

    As suggested I’m just going to replace the seals on the vent and drain ports, and check mid-season next year

    I don’t think a capful is anything to get too worried about
    I'd run it the first time next season and take a zip tie to dip the oil from the top plug when you get it home you'll see right away if it's milky how bad it leaks. Check behind the prop for fishing line if you have the time.

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    I would get a new seal kit for the motor, cheap insurance.

  11. #10
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    You didn't say how old your engine is or when you last replaced the impeller, so I would replace the the impeller and do a seal kit as fishhawk suggested. I also replace the fill and drain plug seals with every gear oil change as suggested by my mechanic. Check for fishing line as it will work its way in and destroy the prop shaft seal.

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