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Old 06 June 2012, 21:41   #1
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help please ! what causes water to leak into the hull

I just bought my first boat. Its a 2001 west marine 310 by Avon rib. I got the holes patched up and gave the Johnson 9.9 motor a tune. My question is the water in my Hull. I tried what I read to do "bathtub test" it. I filled the inside of the boat with water. I let it set for about half an hour. I pulled the upper plug to drain it. After it was empty I undid the lower Hull drain plug I got about about a gallon of water out. What is the best place to start to figure out a fix. The deck looks in good condition w no damage or holes. That makes me think the water is getting thru along the seams where the rubber meet the fiberglass. How do i seal this exchange of water? Is it normal to get water in between the deck and Hull? If not what's the drain plug for?
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Old 06 June 2012, 22:52   #2
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Here she is

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Old 07 June 2012, 03:38   #3
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The bung is to do exactly what you just did - drain the cavity. The leak may actually be the bung! You might be surprised just how not waterproof some of these bungs can be!

A trick I used on my old laser (and on the rib) is to coat the thread / seal area (depending on your bung design) with petroleum jelly. (think of it like a non setting liquid gasket) - it works wonders to seal bungs and threads on access hatches!

Only thing is you need to remember to clean & re- coat it every so often, as it will eventually dry out.
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Old 07 June 2012, 07:59   #4
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petroleum jelly.
I didn't realise you worked for the BBC?
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Old 07 June 2012, 08:15   #5
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Sorry - spent too long round your corner of the world having to pretend I worked for them so anyone could understand me......

Slap yer missis' vas oanit.
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Old 07 June 2012, 08:38   #6
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easy check :- if boat on a trailer , first thing in the morning b4 sun gets hot put bung in as hard as you can with a bit of grease or vaseline to help it seal and wait for temp to rise , when warmer release bung , there should be a small whoosh as the air in the void escapes having expanded with the warmth. if no whoosh then there is a leak elsewhere. Clean bung off before going to sea ! Now imgagine the process in reverse , put warm boat on cool sea and a vacuum is created which if the bung aint working 100% will allow a small amount of water in , i have this problem as i am on a drying mooring , am replacing bung with a high quality fitting ( brass i think ) as soon as i can be bothered to get the trailer out .
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Old 07 June 2012, 09:01   #7
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Slap yer missis' vas oanit.
That's more like it
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Old 07 June 2012, 09:30   #8
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Here are both sides of the back where the bungalow are. Both have new plugs. How can water leak from the top one (inside deck) to the lower one? Is there a hollow space between the 2. Boat is on a trailer and both plugs have a little coating of vaseline.

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Old 07 June 2012, 09:34   #9
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Should I replace the inserts that the plugs go into? I checked them and re installed them with some silicone to ensure a good seal. Is that the correct thing to do?
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Old 07 June 2012, 09:43   #10
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From several thousand miles away I'd be suspect of the D ring bolted to the transom brace in the 2nd pic. I'd suspect these could be leaking in to the void (yes there is a gap between the deck and outer hull) . Pull up the black plastic covers and have alook see and try tightneing the bolts on them ( assuming they are the 'normal' sort)

I'd suggest filling the hull to just over those but not as high as the tube/ hull join and see if the same happens with water in the void. If water is there it has to be these ( or if there are tie downs for a petrol tank on the deck? )
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