Through hull fittings

[scorch]

Can anyone suggest the best way to remove through hull fittings that are below the waterline? Boat will be on blocks but problem is that fitting is seized and turning in hull !!!! Should I try to carefully split the nut with a sharp cold chisel and saw off the old seacock? Thanks in advance, Scorch.

<hr width=100% size=1>

 

[paulrossall]

Most (but not all) fittings have specially designed bits inside the shaft so if you put a pipe wrench handle up the hole (or down the hole) you can prevent the fitting turning.

<hr width=100% size=1>

 

[DavidGrieves]

Yeah, as Paul says put a tool handle or similar down through the skin fitting or get a mate to hold one from below (there might be a couple of lugs on the inside) this should stop it turning. If all this fails try using a Dremel type tool and slit the backing nut. Dremel shouldn't put too much heat into the hull. I wouldn't bang too hard on the fitting/hull!!!

<hr width=100% size=1>

 

[neil_s]

I have the same problem! For what its worth, I have found that a Stilson wrench grips those thin nuts (and sea cocks) better than a normal flat one. You might also find that a second stilson will grip the outside of the skin fitting. All you need then is a helper. I will try this after work tomorrow and let you know how I get on!

Neil

<hr width=100% size=1>

 

[roger]

I suspect that a boat yard would use an angle grinder fairly cautiously (to avoid overheating). In any case a small amount of heat may help to free up the nut.
I dont think I recommend this action - it depends how desparate you get.
Its also often possible to lock or wedge a tool onto the seacock body to prevent it turning.
A final thought. It is sometimes possible to turn a reluctant nut by using a cold chisel and hammer - applied in the direction that will undo the nut.

<hr width=100% size=1>Roger

 

[dickh]

I had to use an angle grinder to get one off, just carefully ground off the flange from the outside then gently knocked it thro'.

<hr width=100% size=1>dickh
I'd rather be sailing... /forums/images/icons/smile.gif