Water Leak on 1994 40 Express

Discussion in 'General Discussion' started by Best of Times, Jan 21, 2014.

  1. Best of Times

    Best of Times New Member

    Oct 10, 2012
    390 SunDancer 2005 Hard Top
    501 Horizons
    I have a 1994 40' Express Cruiser that is getting water in the floor storage compartment in the cabin directly adjacent to the sink. It is not coming from any of the plumping inside the cabin. It is coming from somewhere outside only when it rains or I wash the boat. Seems to be runnng down the hull liner and then along the floor board to the storage space. Anyone experienced that condition. I am also afraid that I could have the similar condition on the starboard side, but the floor is sealed in that area and I cannot tell if water is in that section of the boat.
  2. 1956olds

    1956olds Active Member

    Oct 31, 2009
    michigan,saginaw bay
    1992 370 ec
    twin cummins 6bta's 300 hp
    Rl80 pathfinder radar/chartplotter,SH 2150 matrix vhf w/ais
    quicksilver 8
    sounds like the windshield screws need to be rebeded.
  3. Jay Bird

    Jay Bird New Member

    Jun 26, 2011
    Lake Of The Ozarks, Missouri
    1999 270DA Sundancer
    7.4 Mercruiser w/Bravo III
  4. DeepBlueHarley

    DeepBlueHarley New Member

    Dec 3, 2014
    South Florida
    1992 400 Express
    Twin Cummins 6BTA5.9LM2
    I have a 92 400EC with the same problem. Did you ever find the cause?
  5. h_gerry

    h_gerry Active Member GOLD Sponsor

    Jun 19, 2013
    Oceanside, NY
    400 Express Cruiser - 1994 with
    Raytheon 41xx Radar, Northstar 6000i GPS
    Kohler 5E
    454 Mercruiser Inboards
    I have the same boat but thankfully do not have the issue. My only guess as to the cause would be the cabin side windows. I am curious if you have seen any signs of water anywhere else, such as the cabinets above or below the sink or behind the refrigerator. Seeing any other signs of water may help identify the source.
  6. PlayDate

    PlayDate Well-Known Member SILVER Sponsor

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    Is this the compartment?


    The water built accumulated between the hull and the bottom of this compartment. There is no obvious place it is entering my boat. That said, I am rebedding the hatches and portholes to eliminate them as a source. Additionally, I am adding two small bilge pumps to remove the water below the compartment.

    It is interesting to note we both have 1994s.

  7. Jay400EC

    Jay400EC New Member

    Jun 16, 2014
    Mayfield,NY Boat on the Great Sacandaga Lake
    1994 400EC,Sea Doo 1800 Speedster Twins
    7.4L Merc BW,7.5 Quicksilver Genset.
    WOW this sounds like the same thing I noticed but only one time on my 1994 400 in the floor compartment right under foot while standing at sink. I noticed near the end of this season vacuumed it out and it has not returned...yet. Please post any findings as I wonder if I will be dealing with this come spring!
    Last edited: Dec 5, 2014
  8. PlayDate

    PlayDate Well-Known Member SILVER Sponsor

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    This is the compartment below your feet as you stand at the sink on my boat. It is definitely coming in from somewhere and/or it has been accumulating there for some time and only recently risen to the level that leaks into the compartment. There is no place for the water to go.

    My first priority was to remove the water from the space. The floor of that compartment is painted plywood. The underside of the floor is not painted and got soaked by the water filling up the space. I have positioned two small bilge pumps in the 4" drilled holes that feed into the shower sump. The reason for two pumps is that there is a divider below the floor that runs the length of the compartment.

    With that under control, I'm now on to eliminating the possible leak points.

  9. Baithb

    Baithb New Member

    Oct 12, 2017
    1994 400EC
    Twin 502 inboards
    I have the same problem on my 94. I cannot figure out where it is coming from and it has only seemed to happen on 2 occasions. I vac it out and stays bone dry most of the time. If anyone ever finds the source, please post.
  10. PlayDate

    PlayDate Well-Known Member SILVER Sponsor

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    It turned out to be the porthole window seals in my case. They leaked water down to the inside hull of the boat and it accumulated there with no where to go.
  11. Gary B

    Gary B Member

    May 20, 2015
    Long Island
    2007 52 Sedan Bridge
    Cummins QSM 11
    There is a part of the fresh water system that is located in the cabinet behind the refrigerator that caused water to leak in the same place in our 98’ 400EC. It looks like a small version of the water expansion tank you might see that n a home but it’s made of lasting. Ours cracked and was dripping fresh water.
    If you remove the refrigerator it’s to the right in the cabinet.
  12. Air O'Nautical

    Air O'Nautical Active Member

    Feb 5, 2008
    Stamford CT "Ponus Yacht Club"
    1995 400EC. Raymarine E80,4kw dome, Garmin 235 gps,
    2013 7.4L Mercruiser Blue water.
    Hurth straight shaft 630's,
    Westerbeke 7.0 BCG

    Yep, I had the same leak and replaced the expansion tank on my 400.
    Viewing/servicing access is easy if you lift the stove-top, that’s only held in place with Velcro tape.
    Push up from below by removing the first drawer.

    Pulling the refrigerator is the best access but, not necessarily easiest.
  13. Baithb

    Baithb New Member

    Oct 12, 2017
    1994 400EC
    Twin 502 inboards
    Looks like this might be a real possibility for me too. All my seals and screens are shot. In fact I cannot even get the gaskets out in one piece. Problem now is that I cannot seem to find replacements anywhere unless I want to replace the entire port lights. That would not be my preference with 6 of them at over $200 a piece. Any advice on finding replacement gaskets?

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