Thru-Hulls

[Mo]

Make life easy.

Removing thru hull in 5 minutes.

Tools:
-electrical cord supply power
-dremel tool
-dremel tool diamond cutting wheel
-hammer
-screw driver

Procedure:

-install wheel on dremel and plug in

-insert the wheel about 3/4 of an inch up inside the thru hull from the outside of the boat. Turn it on and cut in a circle around the thru hull...you are cutting the shaft. This step takes about 1 minute.

-go inside the boat and tap the inside portion of the thru hull with hammer and it will fall away onto floor. (you will usually hear them fall over when you are still outside as your cut is complete) If you can see it you may tap the outer piece and it will fall to ground. If you can't do that go back outside and put the tip of the screwdriver in the hole and pry the outer piece off...easier than it sounds.

(total time up to now is about 5 minutes)

-clean area up from previous sealants etc.

-mix some epoxy resin and put some around the exposed edges of the fiberglass the entire thickness of the boat....this will seal the fiberglass and it rarely done during construction. Allow to dry (not necessary but a nice touch).

-install new thru hull.

Pics
- thru hull ....red line is about where you cut.
- dremel diamond wheel.

PS ... I might have come up with that one when doing my thru hulls back in 2007. Strained my intercostal muscles (ribs) leaning down under forward tank pulling on wrench to change head and holding tank thru hulls. I never heard of anyone cutting them like that but they would go back in to a hole and try to cut it from the inside....I was already too sore for that. After a smoke, beer, withering around in spasms swearing I had to come up with a way to:
a) stay out of that spot
b) no more wrenching today
.... so, this little procedure popped into my tiny little mind. I don't know how many I've taken out down around the club...usually do a couple every spring.

[romantic comedy]

Nice job Mo.

I have my way too. Let me see if I can give a decent description.

Get:
threaded rod that will pass thru the fitting.
a few blocks, 2x4 and such
nuts and wrenches.

Cut a block to fit over the inside of the fitting. Drill a hole to pass the rod thru it.
Pass the rod thu the fitting.
Cut a block about 6 inches long. Drill a hole for the rod.

Pass the rod thru the block, inside the hull.
Place the 6 inch block on the rod, outside the fitting.
Place some shims between the block and the hull.

Tighten the nut on the rod, and extract the fitting from the hull.

I have no idea how long it will take. Probably for me, 6 hours. Depending on if I hurt myself or need stitches, or if my wife texts me.

I dont recommend this procedure underwater.

[roadnsky]

...
The pic below shows the parts I think are right for this job - 1 1/4" stuff. If anyone has a better idea (or less costly), I am all ears.

Howard-
That is almost exactly what I used on both of my sink drain replacements.
Except my Pipe-to-Hose Adapter was also Groco

[Hymodyne]

Howard-
That is almost exactly what I used on both of my sink drain replacements.
Except my Pipe-to-Hose Adapter was also Groco

What type of hose is pictured here? is it appropriate for a thru hull and seacock for a raw water to strainer application?

James

[roadnsky]

What type of hose is pictured here? is it appropriate for a thru hull and seacock for a raw water to strainer application?

Hi James.
That hose is specific for a SINK DRAIN (see pic)

For your water intake I'd suggest you use a water hose equal to what MMI has available here on the site.

[Hymodyne]

Many thanks Jerry.