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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 08-01-2013
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What is this throughhull?

I have a pretty minimalist boat, I only have two throughhulls, both for the head. The intake valve is a modern ball valve. The outtake is this thing. I'm not sure what you call it.

The handle is a bit stiff and it concerns me. I did not overhaul it prior to launching (didn't know I had too!). So I'm not sure if it would function better if I did some maintanence on it. It does function. But the handle is very stiff and feels a bit fragile.

Can you tell me what type this is? If it were you're boat would you replace it? It looks pretty ancient to me. The surveyor did not give it a second look. It leaks a little bit but I think mostly because I forget to tighten the clamp in the back.

Thanks!
PaulWhat is this throughhull?-imageuploadedbytapatalk1375370324.989719.jpg
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Old 08-01-2013
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Re: What is this throughhull?

Looks like it has a zerk fitting for adding grease. Or maybe that is a winter drain.

Looks like a tapered cone style seacock. The nut on the back directly in line with the handle shaft must be balanced between operability and leaking. Too tight and it will be hard to turn teh handle. Too loose and it will leak. The proper amount of grease should get it not to leak while still being easy to turn. The unit appears to be fairly easy to overhaul on the hard.

It looks pretty awful but is likely still in great condition. I would not replace as they are very simple to use and maintain and very unlikely to fail.

Probably an older Groco like this:
Image courtesy of www.westsailparts.com
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Last edited by Tim R.; 08-01-2013 at 11:59 AM.
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Old 08-01-2013
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Re: What is this throughhull?

Servicing Tapered Cone Seacocks Photo Gallery by Compass Marine at pbase.com
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Old 08-01-2013
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Re: What is this throughhull?

Looks like my groco thru hulls. I have a grease fitting that you can screw in place of that plug. You can grease in the water, so I'm told.
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Old 08-01-2013
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Re: What is this throughhull?

If it has the T handle on the back side it's a Groco If you loosen the T handle a little and then work the valve it should loosen up. Do not use heat on it as the inner barrel seal is made of a rubber compound. The t handle has a bronze plate behind it so that when you tighten it slightly it will sqeeze the rubber making a snug seal. If you take it apart to lube do not use a petroleum based grease as it will decompose the rubber or so my surveyor told me when we bought our boat. the reason the handle feels soft like it will break is because you are distorting the rubber before it turns. My surveyor told me to loosen the T handle a little before turning the valve, then snug it back up to stop any weeping.
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Old 08-01-2013
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Re: What is this throughhull?

That looks exactly like it. I guess I'll check it out in the fall and see if it loosens up a bit. Thanks for the help.
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Old 08-01-2013
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Re: What is this throughhull?

The fact that it is leaking, and stiff, says to me that it is worn. Normally when you adjust them, they will stop leaking when they are still easy to turn. If they are worn, you can crank them up really tight and they still leak.

What you need to do when you next get a chance to service it is lap the bore and outside of the plug, and grease it well.

You could maybe slacken off on the adjustment slightly, see if it becomes easier to turn without leaking unduly.

Usually when they've had any kind of recent maintenance there'll be some grease oozing out around the ends. I don't see any on yours.
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Old 08-01-2013
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Re: What is this throughhull?

That is a true Groco seacock and they are very good. As someone else said, adjust and grease it and it should be fine.
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Old 08-02-2013
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Re: What is this throughhull?

TimR nailed it. It's a Groco SV series seacock last made about twenty years ago. I must have sold hundreds of them in the seventies and eighties. It is a good seacock but unfortunately the rubber plug has a limited life and they are no longer available. At some point you'll need to replace it.

The plug on the side isn't for grease but to drain it in winter.

You can extend the life of the rubber by just tightening the T-Handle enough to stop the drips and no more.

Always loosen the T-Handle before you try to open or close the valve. If you don't you wear the rubber faster and can break the shaft free of the rubber. If that happens, it's time for a new seacock.
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Old 08-02-2013
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Re: What is this throughhull?

How hard would it be to refit with a new ball valve? Would the hole in the hull likely be the same size for the new valve?
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