Leaking water while underway

Discussion in 'General Maintenance/Repair Questions' started by Hunter, Jan 21, 2018.

  1. Hunter

    Hunter New Member

    8
    Oct 21, 2017
    2004 Sea Ray 240 Sundancer
    Mercruiser with Bravo III Outdrive
    I have a 2004 240 Sundancer with a Bravo III outdrive. I keep the boat moored on Lake Washington year round, and whenever I go down to use the boat after it sits for a few weeks, the bilge has very little water in it. Once I get underway I can cruise for a couple hours and then it is has almost a gallon of water in the bilge. I haven't taken a look at anything yet, because I wanted to know if this is a common problem.
    Thanks
     
  2. Creekwood

    Creekwood Well-Known Member GOLD Sponsor

    Apr 26, 2009
    Oakville and Georgian Bay, Ontario
    '97 330 Sundancer
    2X 454 w/ vDrives
    I think if you search this site you will find that some people have found gaps around the rub rail where the hull joins the deck that allows water to get up into the gap and in the bilge. The fix was to take it apart, seal the gap with 5200, and put it back together.

    Other areas of potential leaks are the various rubber bellows on the outdrive that get cracks in them after a few years and need to be replaced.
     
  3. BillK2632

    BillK2632 Well-Known Member SILVER Sponsor

    Jun 25, 2009
    Lake Norman, NC
    1999 185 Bowrider,
    Mercruiser 4.3, Alpha I
    It could be a number of things, going to need to take a close look while the engine is running. First places I would look, (with engine running) is all the blue drain plugs on the block and manifolds, the raw water pump and hoses and the engine circulating water pump. If it is original, the circulating pump is a likely culprit, the seals tend to fail in these in raw water cooled engines, the symptom is a steady drip out of the bottom of the pump, only while the engine is running.

    The bellows could also be the problem, but I would expect a bellows leak to leak all the time, not just when the engine is running. Usually the first bellows to go is the shift cable, and usually will leak first when the drive is trimmed up and slow or stop when it is trimmed down.

    As far as the rubrail creekwood mentioned, look for telltail signs of water running down the inside hullsides in the engine room.
     
  4. Creekwood

    Creekwood Well-Known Member GOLD Sponsor

    Apr 26, 2009
    Oakville and Georgian Bay, Ontario
    '97 330 Sundancer
    2X 454 w/ vDrives
    Good point on the blue block drain plugs. Notorious for breaking off. Easy to spot if you look in the bilge while the engine is running. Here is what they look like when they break off:
    IMG_1438.JPG
    [​IMG]
     
  5. Hunter

    Hunter New Member

    8
    Oct 21, 2017
    2004 Sea Ray 240 Sundancer
    Mercruiser with Bravo III Outdrive
    Thank you all for the help. I will head down to the marina and check it out soon.
     
  6. KnotEasy

    KnotEasy Member

    242
    May 14, 2013
    Whitehall, Mi.
    205 Sport
    5.0L MPI
    When running, also check exhaust manifold's for a crack/leak.
     

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