Raymarine ST40 speed transducer nearly sunk me - Page 2 - SailNet Community
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post #11 of 13 Old 05-06-2013
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Re: Raymarine ST40 speed transducer nearly sunk me

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Originally Posted by smp View Post
What do I do now?
Check out your theory on the crack in the thru hull and if it looks OK I suggest you break out a tube of 5200 and re-seal the thru-hull. Relying on the gaskets alone may be the problem.

The 5200 will need time to cure so perhaps it's best to have them block you ashore while you sort it out.

DIY is not without it's costs.

PS I know 5200 is "permanent", but so is the darn thru hull (or at least it should be).
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post #12 of 13 Old 05-06-2013 Thread Starter
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Re: Raymarine ST40 speed transducer nearly sunk me

I used 4200 to bed the thru-hull and that's not what is leaking. The blank plug leaks too.

I think what happened is this: the hole for the thru-hull is located under the bow, right in the middle where the hull forms a vee. The thru-hull fitting is plastic, instructions say "hand tighten only". I think I overtightened. "Hand tighten" used to mean "tighten as hard as you can with your hands" lol, now I know better. I think the instructions should say "snug", anyway... When that plastic thru-hull was tightened too far it deformed because it's not on a flat part of the hull. The two o-rings on the transducer (and plug) no longer formed a water tight seal. That's my theory.

I happened to have a spare o-ring for the fuel fill, just so happened that it was the exact same size only slightly thicker. I replaced the top o-ring with that and it slowed the leak further. Hmm... I went out and got another o-ring to replace the lower o-ring but couldn't find a suitable size. I ended up using the yellow plumbers tape simply because it's what I had, to build up a layer underneath the original o-ring. It worked. Leak is now stopped.

That doesn't mean I'm not hauling the boat in the next few weeks to replace the thru-hull with raymarine's bronze version.

4200 is fine. You don't need to "glue" the thru-hull into place. The mechanical hold is supplied by the threads etc. All you need is something that'll keep the water out. C&C used butyl tape down there, never once leaked as evidenced by the bare plywood backing plate, bone dry. I used 4200 on the rest of my thru-hulls and they are fine too.

Last edited by smp; 05-06-2013 at 11:00 PM.
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post #13 of 13 Old 05-06-2013 Thread Starter
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Re: Raymarine ST40 speed transducer nearly sunk me

Also sorry for super ranty thread yesterday. I was convinced my boat was sinking and had been doing nothing but "boat launch stuff" for four days straight, all day, every day. Kinda wired.

Thanks for all the help and advice.
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