'frozen' thru hull fittin's - SailNet Community

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  #1  
Old 08-09-2006
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'frozen' thru hull fittin's

Any suggestions to loosen up an make work thru hull fittin's?
I'm thinking take off hoses an sqirt some pby rust bustin or liquid wrench
down there an let it do its thing for a few days before I start bangin
on it.
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Old 08-09-2006
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What is frozen on them? I assume it is the seacock attached to the thru-hull. A Thru-hull is technically just an piece with a hole in it that passes through the hull and has no parts to freeze or tighten up. A penetrating oil might help, if they're just stuck from disuse, however, they may be corroded in place or be frozen due to mineral deposits or sea growth.

If it is the seacock attached to the through hull, it would help to know what kind of seacock it is. Are they bronze or plastic? Are they gate, tapered cone, or ball valves?

It sounds like they were not properly maintained, and have seized up. If that is the case, they may in fact be corroded badly enough that your only option is replacement.

If you do need to replace them, I would go with a high-quality marine bronze ball-type valve seacock. Your other choice is a ball-type valve Marelon seacock, which may make a lot of sense, especially in the case of a metal hulled boat, where galvanic corrosion is an issue.
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Old 08-09-2006
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You neglected to specify the type of valve that is frozen.

While it makes little difference in the freeing process (a) penetrant, (b) heat. It matters much in deciding if you should even bother to try to free them up.
(0) A brass globe valve is unlikely but are occasionaly seen. They should be replaced immediatly.
(1) An old brass gate valve could be freed up if you were a true yankee tinkerer who could 'do it all' including determining if the valve had deteriorated significantly due to electrolysis. If not deteriorated a gate valve can be lapped back to a tight seal but few peole in this hemisphere would bother to do so except in the case of a large/expensive industrial gate valve. Gate valves are not considered a good choice for thru hulls but are fairly common.
(2) However !!!!!! , an old fashioned tapered plug seacock can always be lapped back to watertightness with just few tools and some grinding/lapping compound.
(3) Modern ball valves are unlikely to freeze but if they do the ball if likely pitted and replacement is indicated. If you try to free up a ball valve they often have plastic seats and so heat is not appropriate or if used must be applied with GREAT care.

Last edited by sailandoar; 08-09-2006 at 10:25 AM.
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Old 08-09-2006
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Another possibility is

that your seacock may have a soft cone as we do. Then the problem may be that the seacock has been tightened too much or for a long time and the cone itself is somewhat deformed. This results in it bulging into throughhull space (or the hose side) Heat or chemical may not be your best choice here and use of a lubricant and careful application of leverage could win the day.

Best of luck
Ike
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Old 08-09-2006
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If the boat is on the hard as your avatar might indicate, and it is tapered bronze., take the nut and washer off and tap it out witha a small hammer.

pigslo
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Old 08-11-2006
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It's probably heresy, but I had a stuck seacock I decided to unstick last month... just hit it with WD-40 around the fitting for about a week, then got down in and gave it a few gentle taps and then steady pressure and it came right open.

I'd certainly give that a shot before taking the sucker apart.
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Old 08-11-2006
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I like that idea best, I'll try that first
hit it with wd spray, sit back an wait
sailors dream
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Old 08-11-2006
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Get yourself a spray can of PB Blaster penetrating catalyst,
faster and much more effective than WD40.


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Old 08-12-2006
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nice pic, TruBlue
I do have two cans of that stuff an will use that to.
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