Leaking Thru Hull - SailNet Community
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post #1 of 9 Old 05-12-2012 Thread Starter
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Leaking Thru Hull

Hello everyone!

My partners and I recently bought a 1978 Catalina 30 which we have been fixing up for the last month. Hopefully today we put the final touches on her (for now), and go sailing!

One thing has been bugging me though. The PO had new thruhulls installed just a few months ago, but they seem to weep water. I've attached a picture so you can see what it looks like. It's not a lot of water at all, just enough to keep that area constantly wet. It looks to me like its coming from the junction of the thruhull and the valve

I was wondering if i can just crank down on that valve a bit and hopefully stop the weep.....or even if i could crank on the nut that holds the thru-hull in. or if either of those is just a bad idea.


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post #2 of 9 Old 05-12-2012
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Re: Leaking Thru Hull


With that kind of installation you have to be careful that you don't break the seal between the through hull and the hull itself. With a proper install that is not a problem as there are 3 bolts used.
Also there is a likely thread mis-match between the valve and the through hull which means there are only a few threads engaged.

They also look a lot older than a few months.

Here are a few good links explaining through hulls and their installation.

Living aboard in Victoria Harbour

Last edited by mitiempo; 05-12-2012 at 04:19 PM.
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post #3 of 9 Old 05-13-2012
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Re: Leaking Thru Hull

I think that your leakage is due to the thread mismatch that Mietiempo refers to. At the very least, to stop the leak, you should remove the valve and re-apply teflon tape to the thread (for which it would have to come out of the water)

It's hard to say what the problem is from the blurry pic. But I strongly suspect that you have a thread mismatch, and I also suspect that some of those tail fittings are not marine bronze, hence the visible corrosion.

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post #4 of 9 Old 05-13-2012
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Re: Leaking Thru Hull

worst comes to worse grab some 2 part aquamend marine epoxy putty, I was forced to use some with a leaky through hull years ago it made it through a season untill the boat got hauled again. If you can pull the boat change the seacock and do it right if not putty it up.
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post #5 of 9 Old 05-14-2012
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Re: Leaking Thru Hull

Thru hulls shouldn't leak. Something was done wrong--the thread mismatch sounds likely. I wouldn't try to tighten them, for the reason mitiempo points out. I think you are facing some re-doing there with the boat out of the water.

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post #6 of 9 Old 05-14-2012
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Re: Leaking Thru Hull

The boat should beon land. Use Loctite to seal. Teflon is good the valve might turn on the thruhull which might cause leakage.
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post #7 of 9 Old 05-14-2012
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Re: Leaking Thru Hull


I can't help with the thru-hull leak, but do say "Wassup!!!" to Damon C for me. And get that boat sailing already!

~ Oban
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post #8 of 9 Old 05-14-2012
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Re: Leaking Thru Hull

Hoses should have 2 clamps as well.

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post #9 of 9 Old 05-15-2012
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Re: Leaking Thru Hull

Originally Posted by obanarama View Post

I can't help with the thru-hull leak, but do say "Wassup!!!" to Damon C for me. And get that boat sailing already!

~ Oban
oban, how the hell did you know greg was my partner? That's freaky dude...

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