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Old 15-08-2022, 10:38   #1
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Sanity check - cutting throughul for a new valve

Hi there,
So a handle on the fridge drain valve broke off taking a half of the shaft leading to the ball itself. I need to replace the valve and already have the new one, but here is the issue - the valve body has fused to the bronze throughull. I'm worried that if i try to force it to come off, even with heat (there is little space for it too since it's inside the cabinet) it may break the throughull. I can't take the boat out of the water at this moment and have to find an alternate solution.


The valve sits about 2.5-3 inches away from the floor, so my plan is to plug it from the outside, cut off the valve , clean up the remaining threads of the throughull and put the new valve on.

My only concerns is this: will the threads seal since one or both are supposed to be tapered in order to provide the seal. I don't know if male, female or both are tapered. I can always put thread sealant since it is no pressure application with minimal flow.

Thoughts?
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Old 15-08-2022, 10:51   #2
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Re: Sanity check - cutting throughul for a new valve

Well it depends on if you have straight or tapered threads

On my boat they are all straight threads
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Old 15-08-2022, 11:01   #3
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Re: Sanity check - cutting throughul for a new valve

It’s a Beneteau and you can plug it from the exterior...correct. We would be certain to fill it with underwater epoxy or cement and don’t even think about touching it unless out of the water.
Gives us the creeps just thinking about it and we’ve done some challenging in the water swaps.
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Old 15-08-2022, 16:12   #4
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Re: Sanity check - cutting throughul for a new valve

You must be bold and confident of your insurance
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Old 15-08-2022, 16:21   #5
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Re: Sanity check - cutting throughul for a new valve

Well, I've done an in the slip valve repair in the past, but had a different set of challenges. It worked out fine. I'm just not 100% sure on how the threads are designed here.

I'll go ahead and do it.
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Old 15-08-2022, 16:32   #6
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Re: Sanity check - cutting throughul for a new valve

Quote:
Originally Posted by George_SD View Post
Hi there,
So a handle on the fridge drain valve broke off taking a half of the shaft leading to the ball itself. I need to replace the valve and already have the new one, but here is the issue - the valve body has fused to the bronze throughull. I'm worried that if i try to force it to come off, even with heat (there is little space for it too since it's inside the cabinet) it may break the throughull. I can't take the boat out of the water at this moment and have to find an alternate solution.


The valve sits about 2.5-3 inches away from the floor, so my plan is to plug it from the outside, cut off the valve , clean up the remaining threads of the throughull and put the new valve on.

My only concerns is this: will the threads seal since one or both are supposed to be tapered in order to provide the seal. I don't know if male, female or both are tapered. I can always put thread sealant since it is no pressure application with minimal flow.

Thoughts?
most male BSP threads are taper ( BSPT) and female threads ( ball valve ) are BSPT, sealing tape may still be necessary

I certainly would not attempt this replacement in the water
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Old 15-08-2022, 16:45   #7
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Re: Sanity check - cutting throughul for a new valve

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I'll go ahead and do it.
You'll be fine. Most through hulls are straight as are the valves. I like to add a bit of thread sealant to the male thread first then 6 to 8 wraps of thread tape and tighten until it bottoms out.
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Old 15-08-2022, 19:34   #8
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Re: Sanity check - cutting throughul for a new valve

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You'll be fine. Most through hulls are straight as are the valves. I like to add a bit of thread sealant to the male thread first then 6 to 8 wraps of thread tape and tighten until it bottoms out.
his issue is the valve is fused to the mushroom fitting, requiring it to be cut below the valve

agree re thread tape, but not tape AND sealant
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Old 15-08-2022, 21:55   #9
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Re: Sanity check - cutting throughul for a new valve

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his issue is the valve is fused to the mushroom fitting, requiring it to be cut below the valve



agree re thread tape, but not tape AND sealant


Why? I use both but light on the tape
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Old 16-08-2022, 03:47   #10
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Re: Sanity check - cutting throughul for a new valve

Go ask any millwright or plumber in an industrial setting and they routinely use both tape and sealant. They might have a favorite combination but using both is a common practice.
Again we wouldn’t touch this job in the water.
The manatee crew.
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Old 16-08-2022, 06:07   #11
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Re: Sanity check - cutting throughul for a new valve

https://marinehowto.com/seacock-thru-hull-primer/
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Old 16-08-2022, 06:49   #12
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Re: Sanity check - cutting throughul for a new valve

Don't bother trying to reuse the the thru hull, if the stem broke off the rest of the metal is suspect. Haul the boat and replace with a proper flange base bronze seacock and thru hull, inspect the other valves as well. Use the haul out as an opportunity to take care of other below the waterline maintenance items, zincs, shaft, prop or saildrive, bottom paint touch up, polish the hull, and so on. I'll bet you'll find enough to do to justify the haul out.

That's what I would do but feel free to follow, modify or ignore as you wish.
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Old 16-08-2022, 07:04   #13
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Re: Sanity check - cutting throughul for a new valve

Get a pack of tapered wood bungs in case you break the thru hull.A wood bung will keep you afloat til you haul out or dive & insert a new thru hull.
https://www.westmarine.com/emergency-boat-plugs/


Get a strap wrench,so you won't break the thru hull(unless thru hull is "rotten". https://www.princessauto.com/en/stra...t/PA0002920582


Get one of these if you think you need it. https://www.svb24.com/en/seabung-emergency-plug.html


Read this: https://www.cruisersforum.com/forums...er-211436.html.


Read the Marine How To in my prev. post about mixing non-tapered thru hull threads(all thru hulls are straight thread) & NPT tapered North American valve threads.


Cheers/Len
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Old 16-08-2022, 07:28   #14
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Re: Sanity check - cutting throughul for a new valve

Another EU production boat thru-hull disaster. It’s like an avalanche.

I also recommend to watch the videos from MarineHowTo, Rod Collins, and replace the whole thing with Groco fitting and flanged adapter.

The fusing of the components is probably caused by incompatible threads or by the brass deterioration.

Like others, I would not do this in the water. Closing off from the outside and using a sponge or shopvac until the next haul out is wise.
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Old 16-08-2022, 07:29   #15
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Sanity check - cutting throughul for a new valve

Quote:
Originally Posted by deblen View Post
Get a pack of tapered wood bungs in case you break the thru hull.A wood bung will keep you afloat til you haul out or dive & insert a new thru hull.
https://www.westmarine.com/emergency-boat-plugs/


Get a strap wrench,so you won't break the thru hull(unless thru hull is "rotten". https://www.princessauto.com/en/stra...t/PA0002920582


Get one of these if you think you need it. https://www.svb24.com/en/seabung-emergency-plug.html


Read this: https://www.cruisersforum.com/forums...er-211436.html.


Read the Marine How To in my prev. post about mixing non-tapered thru hull threads(all thru hulls are straight thread) & NPT tapered North American valve threads.


Cheers/Len


In general BSP male threads are taper and female threads are parallel. Since this boat is European don’t use NPT fittings anyway

No need for a flange based fittings but if you must have one Maestrini in Italy make a BSP flanged sea cock for about € 400
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