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Old 01-02-2016, 14:25   #1
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What do these big nuts cover? See photos

There are four of these massive nuts under my floor boards.
10 m steel, long keel cruising cutter.

Too big for any tool of mine to undo.
One is under the mast, 3 more evenly spaced on centre line further aft under cabin sole.Click image for larger version

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Old 01-02-2016, 14:40   #2
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Re: What do these big nuts cover? See photos

Keel bolts?

Please don't eat those raisins.

John
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Old 01-02-2016, 14:46   #3
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Re: What do these big nuts cover? See photos

Those look like plugs, not nuts. Integral tanks?
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Old 01-02-2016, 14:51   #4
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Re: What do these big nuts cover? See photos

Yeah, plugs, but PVC or cast steel?



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Old 01-02-2016, 15:26   #5
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Re: What do these big nuts cover? See photos

I'd guess those are to access the keel void to fill it with lead or cement an or oil.

An they're not nuts, rather pipe plugs.


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Old 01-02-2016, 15:59   #6
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Re: What do these big nuts cover? See photos

Gotta agree - plugs. Maybe provide access to the keel bolts. Looks to be about 2" nut on the plug, which might provide access through the pipe for a 1" socket.

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Old 01-02-2016, 16:50   #7
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Re: What do these big nuts cover? See photos

Steel boat with bolted keel? I'd vote for bungs to (a) keel tank(s)

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Old 01-02-2016, 17:35   #8
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Re: What do these big nuts cover? See photos

Assuming a steel boat, probably for either future tank use or pumping out voids.
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Old 01-02-2016, 17:37   #9
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Re: What do these big nuts cover? See photos

Steel keels are often filled with scrap &/or concrete. To prevent corrosion, oil is often added. The question comes up often.
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Old 01-02-2016, 18:00   #10
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Re: What do these big nuts cover? See photos

Get yourself a 1/2 " drive 12 point socket large enough to fit the plug, and then a short enough extension to clear the floors, and a breaker bar (long handle also 1/2 " drive (sometimes a torque wrench will do), and open that puppy up and tell us what you find!

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Old 01-02-2016, 18:20   #11
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Re: What do these big nuts cover? See photos

If you do pull a plug, have a bilge pump down there, perhaps an appropriately sized tapered plug as well. I'd hit it with PowerBlaster penetrant first. When you start to remove it, go easy. If you round off the square lug the whole operation gets a lot harder. You'll also want some pipe dope or anti-seize on hand to re-seal the threads when you put it back in. Personally, I'd have a new plug on hand, just in case.
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Old 02-02-2016, 07:36   #12
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Re: What do these big nuts cover? See photos

Is the title of this thread a bumper sticker referring to Trump?
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Old 02-02-2016, 08:33   #13
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Re: What do these big nuts cover? See photos

You wouldn't need too big of a pipe wrench to tackle those plugs. I'd be surprised if you haven't got one that size already that you use to adjust your packing nut.

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Old 02-02-2016, 08:42   #14
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Re: What do these big nuts cover? See photos

That's where they stored the raisins.
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Old 02-02-2016, 09:32   #15
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Re: What do these big nuts cover? See photos

they are plugs, open them up and find out stick a rod down their and see whats in there
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