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Old 16 November 2015, 00:48   #1
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water seeping out of bottom transom - OK?

I recently bought a used Zodiac Pro 470 (1991 year model)

its in fairly good shape and i was drilling small holes in the bottom of transom to install transducers and water started running out of the holes..

is that bad?

picture below of hole and water seeping out..

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Old 16 November 2015, 01:44   #2
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do they have plywood inside the transom ? if so you might have problems if the plywood is soaking wet inside
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Old 16 November 2015, 02:25   #3
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no idea if they do..

This is a fiberglass hulled 1991 Zodiac Hurricane Pro 470 RIB.

Does anyone know if it has wood down that low?
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Old 16 November 2015, 03:11   #4
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looks to me the holes you have drilled are below the level of the drain plug
Hence there may well be some water left in the hull..
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Old 16 November 2015, 03:18   #5
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What came out of the hole when you drilled it? Fibreglass? Wood? Quite often the lowest part of transom is solid glass. If you are not sure another hole will tell. As sonar says if you went right through it could just be bilge water
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Old 16 November 2015, 03:41   #6
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I'll drill a little higher and check.

The smaller hole was about level with the bottom of the drain and another slightly above.

the drain in the pic is not a hull drain plug, its a hole through the transom that drains from the deck's lowest point int the back of the boat.

I'll drill a little bigger hole higher to check for rot.. i can plug it later with 5200 or something..
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Old 16 November 2015, 07:22   #7
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I have 1980's 530 Pro. The transom has an upper angled section, which solid ply (and thankfully is solid) and a lower vertical fiberglass only section which the hull void plug goes through. This section has no ply behind it and is purely fiberglass about 5-6mm thick. The area where the deck drain plug goes through is solid ply. I had the reverse problem when I forgot to fill the old transducer holes into the fiberglass section and filled the hull somewhat.
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Old 16 November 2015, 10:14   #8
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Did you drill all the way through the transom, if you did (stick something through to check) then I am sure you will be fine as this will be water in the bottom of the hull, below the drain plug.
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Old 16 November 2015, 11:08   #9
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Could drill the next larger size and see what comes out in the bit flutes (If it's composite, you should be OK. If it's wood, you may have a rot problem, now or later.)

In any case, it would be wise to seal the hole with a bit of marine caulk or 3M 4200 prior to reinstalling the transducer (squirt/tamp some sealant in, then insert screw.) Especially if the boat is exposed to hard freezing temps, as any residual water will try to split things when it freezes.

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Old 16 November 2015, 19:17   #10
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It has a wood core.

Your transom is probably shot. Smack it with a hammer in a couple spots. Good wood rebounds. Bad wood makes a thud and cracks the gel coat.
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