water between the double hull

gordovip24

New Member
Aug 9, 2008
41
Pasadena, MD
Boat Info
1986 390EC
Engines
T-454 FWC Mercruisers
how can water get between the double hull on a 86 39' ec
Is there a cut away that we can look at.
There was a water problem in the anchor locker and with the sky light in the bathroom but that has been fixed.
I noticed a weep hole in the mid floor locker and that is were the water is coming out of...up from the bottom when the boat sloshes with the waves.
:smt021
 
THis boat does not have a double hull. You do have a false floor in the bottom of the storage lockers and you have water trapped between the hull and that false floor.

You will need to saw a hole in the floor justy ahead of the water tank with a hole saw....about 3" is good. Then break away a little of the foam under the plywood and vacuum the water out of the area between the hull and floor with a shop vac.

Water can come from most anwhere and end up here.......anchor locker leaking, rail stanchions leaking, fixed ports leaking, bilge sumps in the engine room leaking, etc. Get the water out and see if it returns, but this is going to take several sweeks of vacuuming every few days to remove water trapped in the closed cell foam that isn't supposed to hold water but does.
 
THis boat does not have a double hull. You do have a false floor in the bottom of the storage lockers and you have water trapped between the hull and that false floor.

You will need to saw a hole in the floor justy ahead of the water tank with a hole saw....about 3" is good. Then break away a little of the foam under the plywood and vacuum the water out of the area between the hull and floor with a shop vac.

Water can come from most anwhere and end up here.......anchor locker leaking, rail stanchions leaking, fixed ports leaking, bilge sumps in the engine room leaking, etc. Get the water out and see if it returns, but this is going to take several sweeks of vacuuming every few days to remove water trapped in the closed cell foam that isn't supposed to hold water but does.

This small hole about the size of a small screw, is forward of the salon storage bin before the shower sump. I put a small amount of plummers putty in the hole, (it did stop).as a temporary measure.
I thank you for your response Frank.:smt038
 
You still have water trapped below the floor. As the level rises, it will find its way out other screw holes further aft. Try removing some of the screws holding the aluminum brackets to the floor and see what happens.
 
I have an 89 390Ec which I recently purchased. I have a problem with water in the area I think being described in this thread. The area forward of the fresh water tank, aft of the shower sump, remains wet even after I have pumped it out and dried it. It is not seawater so I assume it is coming in from various locations up top such as windshield seals, rail mounts, etc. The confusing part is there seems to be two parallel stringers, one on either side of the freshwater tank and running the full length of the boat. I can not locate any drains through these stringers so I can not determine how fresh/rain water incursion makes it to the center area where the freshwater tank resides. I have not checked the area beneath the floor in the storage area so I do not know what the status is in this area. I will do that next. I also have a small area at the base of the sink in the head which shows some area of water as well. This could be a trail to the water incursion but again I'm not sure how it is making it past the main stringers. Any help would be greatly appreciated.
 

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