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15-08-2022, 10:38
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#1
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Registered User
Join Date: Jul 2020
Location: SoCal
Posts: 692
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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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15-08-2022, 10:51
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#2
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Registered User
Join Date: Oct 2013
Location: Lake City MN
Boat: C&C 27 Mk III
Posts: 2,647
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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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Special knowledge can be a terrible disadvantage if it leads you too far along a path that you cannot explain anymore.
Frank Herbert 'Dune'
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15-08-2022, 11:01
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#3
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Registered User
Join Date: Oct 2019
Location: Kennebunk ME
Boat: Owner built 60’ Aluminum Expedition Yacht.
Posts: 1,854
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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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15-08-2022, 16:12
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#4
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Moderator
Join Date: Jan 2010
Location: Minnesota
Boat: Tartan 3800
Posts: 4,759
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Re: Sanity check - cutting throughul for a new valve
You must be bold and confident of your insurance
__________________
The best part of an adventure is the people you meet.
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15-08-2022, 16:21
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#5
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Registered User
Join Date: Jul 2020
Location: SoCal
Posts: 692
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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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15-08-2022, 16:32
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#6
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Nearly an old salt
Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 22,801
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Re: Sanity check - cutting throughul for a new valve
Quote:
Originally Posted by George_SD
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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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
__________________
Interested in smart boat technology, networking and all things tech
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15-08-2022, 16:45
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#7
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Registered User
Join Date: Dec 2019
Posts: 486
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Re: Sanity check - cutting throughul for a new valve
Quote:
Originally Posted by George_SD
I'll go ahead and do it.
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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.
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15-08-2022, 19:34
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#8
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Nearly an old salt
Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 22,801
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Re: Sanity check - cutting throughul for a new valve
Quote:
Originally Posted by Ballsnall
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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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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Interested in smart boat technology, networking and all things tech
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15-08-2022, 21:55
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#9
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Registered User
Join Date: Oct 2013
Location: Lake City MN
Boat: C&C 27 Mk III
Posts: 2,647
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Re: Sanity check - cutting throughul for a new valve
Quote:
Originally Posted by goboatingnow
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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Why? I use both but light on the tape
__________________
Special knowledge can be a terrible disadvantage if it leads you too far along a path that you cannot explain anymore.
Frank Herbert 'Dune'
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16-08-2022, 03:47
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#10
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Registered User
Join Date: Oct 2019
Location: Kennebunk ME
Boat: Owner built 60’ Aluminum Expedition Yacht.
Posts: 1,854
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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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16-08-2022, 06:07
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#11
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Registered User
Join Date: Oct 2014
Location: Bay of Fundy,Grand Manan,N.B.,Canada N44.40 W66.50
Boat: Mascot 28 pilothouse motorsailer 28ft
Posts: 3,197
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Re: Sanity check - cutting throughul for a new valve
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My personal experience & humble opinions-feel free to ignore both
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16-08-2022, 06:49
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#12
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Registered User
Join Date: Jan 2014
Location: St Michaels MD
Boat: F&C 44
Posts: 181
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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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16-08-2022, 07:28
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#14
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always in motion is the future
Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 18,757
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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.
__________________
“It’s a trap!” - Admiral Ackbar.
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16-08-2022, 07:29
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#15
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Nearly an old salt
Join Date: Jun 2009
Location: Lefkas Marina ,Greece
Boat: Bavaria 36
Posts: 22,801
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Sanity check - cutting throughul for a new valve
Quote:
Originally Posted by deblen
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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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Interested in smart boat technology, networking and all things tech
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