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Where is the Water Coming From?

Discussion in 'Ocean Yacht' started by Tashmoo, May 28, 2018.

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  1. Tashmoo

    Tashmoo New Member

    Joined:
    Oct 24, 2016
    Messages:
    30
    Location:
    Cape Cod
    Here's a head scratcher...

    I'm getting small amount of salt water trickling down from the horizontal surface directly below the after end of the fuel tanks on the outboard side of both engines. About a cup of seawater accumulates under the P&S transmissions below the dripless shaft seals after a 2-3 hour run at speed. It only happens after being underway at speed and it does *not* happen in very flat sea conditions. I can't find the source and it's driving me crazy. Rebedded all the hull sides discharges (fresh water, bilge pumps, etc.) Reclamped all the raw water exhaust all the way back to the transom. Maybe getting up and in behind the rub rail?

    Maybe someone here as experienced and solved this.
  2. Trak

    Trak New Member

    Joined:
    Mar 15, 2014
    Messages:
    12
    Location:
    Lighthouse Point, FL
    Don’t know the boat type, but my old Hatteras aft quarter spray rails were thru bolted on to the hull sides. Some of the bolts worked loose and would wick water through when in rougher seas.
  3. RER

    RER Senior Member

    Joined:
    Jan 20, 2009
    Messages:
    1,044
    Location:
    Newport Beach CA
    Do you have ER vents in hull sides? There's a reason Ocean Yachts moved them to the inside of the cockpit on later models.
  4. Trinimax

    Trinimax Member

    Joined:
    Jan 18, 2010
    Messages:
    157
    Location:
    Trinidad and Tobago Yacht club
    Hi Tashmoo, I am finding a small amount of saltwater under my starboard side shaft seal as well, and I cant find the source. The seal is dripless and there are no leaks while at rest or running. The engineroom vents for the 43 are located in the cockpit, so it cant be from that. This one is a bit of a head scratcher.

    I have a transducer in the are by the stbd shaft seal and my only guess is that it might not have been sealed properly, and it leaks when under pressure at high speed as I cannot see any leaks at rest.

    good luck and let me know what you find
  5. Tashmoo

    Tashmoo New Member

    Joined:
    Oct 24, 2016
    Messages:
    30
    Location:
    Cape Cod
    Same boat, same issue. Makes me suspect it's a common source. Prospective? Stir? You guys seeing this? Mine is def not thru-hull related. Have you seen water present at the aftermost end of the deck where the starboard fuel tank is mounted? That's the entry point for me into the engine compartment, but I'll be damned if I can find the source.
  6. Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    10,055
    Location:
    Fort Lauderdale
    Maybe your trim tab is weeping water?
  7. Prospective

    Prospective Member

    Joined:
    Sep 27, 2016
    Messages:
    96
    Location:
    New England
    Well, that's one problem I don't have! Some random thoughts... Could the collar around the fuel fill be leaking? Are you sure it's running down from the shelf that the tanks sit on or could it be the shaft seal it's self. They often only leak when running. I have the norscott seals that use ATF as the lubricant, not sure about other boats but mine have been dry.

    Another thought, when I purchased the boat my fiberglass raw water exhaust was leaking where it passes into that vented bulkhead aft of the engine/tank. I had to be removed and reglassed.

    As much as I hate doing it you may have to climb down their while underway if that's the only time it happens.

    Now if only someone could tell me where the rainwater is getting into my forward bilge....
  8. chesapeake46

    chesapeake46 Senior Member

    Joined:
    Jul 26, 2009
    Messages:
    1,042
    Location:
    Chesapeake Bay, Delaware Bay & S.Jersey
    Maybe a good application for a cheap remote CCTV camera and a light to record different areas while underway.
  9. Boomer

    Boomer Member

    Joined:
    Oct 14, 2017
    Messages:
    158
    Location:
    Seminole
    Maybe going down the wire chase from the bridge? Look higher
  10. Stir it up

    Stir it up New Member

    Joined:
    Jul 5, 2017
    Messages:
    4
    Location:
    Plymouth MA
    Thankfully I have not seen that issue yet on my 43. I did have a small drip into my master stateroom, port side, that was weeping through a bow rail deck screw.

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