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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 02-21-2003
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Thru Hull Removal

I thought I read somewhere that it was possible to grind down the exterior of the thru hull until the lip is gone and then pull the shaft/nut/ball valve combination out from the interior. Obviously, this would be done when the interior items are hard to get at or corroded. Has anyone heard of doing it this way?
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Old 02-21-2003
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Thru Hull Removal

Yes, I did something similar once...I was able to back off the nut on the inside for a few turns an then it froze....I took a hacksaw and cut the flange off the outside of the through hull and pulled the whole mess free...

Grinding the flange off from the inside seems much more straightforward than standing on your head struggling with fittings in a cramped compartment.
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Old 02-21-2003
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Thru Hull Removal

If it is not the type that is recessed into the hull, you''ll be able to it. The type that stands proud of the surface has no shoulder underneath. But before you get started, be forewarned: Grinding bronze and brass generates a lot of heat! Enough to easily destroy the surrounding materials, be it fiberglass or wood.

I would recommend instead that you go through the trouble of trying to get a few turns of the nut off and push the fitting out a bit. Then you should be able to get a long saws-all blade or a hack-saw blade in between there to chew away at the thing without doing irreparable damage to your hull.

Pi
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Old 02-22-2003
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Thru Hull Removal

Pirate -

Do you recommend using heat to try and free up the nut a bit? It''s pretty well frozen in there....
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Old 02-22-2003
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Thru Hull Removal

Stormer,

What about trying to get a dremel tool with a cutting wheel in there? Dremel tools have a cable attachment option that can get into very tight places and with the cutter tool you could cut off the nut if you wanted to. I have been able to cut through stainless steel with one.
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Old 02-23-2003
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Thru Hull Removal

God NO! You''ll burn a hole through your fiberglass hull long before you heat that nut up enough to cut it. The Dremel tool with cut-off wheels is a good idea. The fitting will be able to sink the heat from that small of a cut well enough. Try to cut a section of the nut off, down to the threads so as not to cut into the fiberglass.
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Old 02-24-2003
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Thru Hull Removal

Thanks everyone...the dremel tool option sounds good....minimal time and effort....
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Old 02-27-2003
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Thru Hull Removal

I beat the wood backing plate out from under the valve flange. Then I could pushed the assembly out far enough to hack saw the head off.
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