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Thread: Oil in bilge

  1. #1
    Join Date
    Feb 2010
    Location
    smyrna, TN
    Posts
    9

    Default Oil in bilge

    Was checking for water in ski locker and found oil mixed in water. I checked the oil level and realized that my oil level was actually too high. Would overfilling engine oil cause oil to leak from pan?

  2. #2
    Join Date
    Jan 2008
    Location
    Pensacola, FL
    Posts
    1,544

    Default

    No, overfilling won't cause oil to leak from the pan. It is sealed (or should be). It MAY be possible that the dipstick tube lost a seal and COULD leak from there, but that is unlikely as well.

    When you say overfilled, by a little or a lot? Overfilling by a lot can cause damage to the engine if you run it that way.

    It would be helpful to know your boat model and year. Look for signs of oil on the block. Typical places are at the rear of the engine where it mounts to the transmission (the rear seal). Around the intake manifold, around the valve covers, around the oil pressure sensor, around the harmonic balancer (the front seal), and around the oil pan gasket.

    If you can't find it. I would fill oil to proper level, hose off the engine and bilge with simply green, and get some UV dye from the auto part store and add to the oil. Run the boat for a few hours and check with a black light. You can see a purple trail of leaking oil.
    1997 MasterCraft 205

    2008 Moomba Outback
    1999 MasterCraft Sportstar OB
    1992 MasterCraft 205
    1999 Malibu Response LX
    1987 Marlin Magnum Skier

  3. #3
    Join Date
    Jul 2008
    Location
    Des Moines, IA
    Posts
    2,633

    Default

    My guess would be vdrive oil leak. Wipe the underside of the vdrive and see if it's oily.

  4. #4
    Join Date
    Mar 2003
    Location
    s.e. washington state
    Posts
    2,119

    Default

    Could be spillage from the oil filter change.
    1998 Mobius
    310 HP PCM

  5. #5
    Join Date
    Feb 2005
    Location
    Ottawa, Ontario, Canada
    Posts
    687

    Default

    Quote Originally Posted by brain_rinse View Post
    My guess would be vdrive oil leak. Wipe the underside of the vdrive and see if it's oily.
    Does anyone have a short list of things that might cause a V-drive leak that are not expensive to check and fix? Mine has a slow leak, so right now I am going through one or two oil sponges a season to keep oil from being expelled to the lake. I assume that there is at least one drain plug or bolt to check, somewhere down in what's now muck.
    2005 XLV, upgraded ballast, Comptech swivel wakeboard and hydrofoil racks, Monster cargo bimini

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