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  #26   IP: 68.56.139.11
Old 05-22-2013, 10:12 AM
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I use a threaded rod, to make a puller. A lot less damage to the boat.
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  #27   IP: 24.44.94.83
Old 05-22-2013, 02:51 PM
jwmurphy jwmurphy is offline
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Thru Hulls

I'm the original owner of a Bristol 27, #364, 1975.

The cockpit drain thru hulls it came with consisted of fiberglass(?) pipe glassed into the hull with hose up to the cockpit drains. No seacocks, valves,etc.

I, too, never liked this arrangement. But, as you implied, it requires removing the engine to make a proper refit. (Yikes, 38 yrs. has gone by and I've still not adressed this issue)

Your ball-cock solution might be an interim step until such time the engine is removed.

Jim
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  #28   IP: 24.145.113.187
Old 05-22-2013, 03:21 PM
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So yesterday, while working on my major rehabilitation projects, I started work on the first of my thru-hull replacements. I started with the galley sink drain. I presume this thru-hull is original to the boat ('77 Tartan 30) and is a simple bronze or brass 1/2" nipple glassed into the hull. This is not a mushroom head or recessed head thru-hull. As I started to take the ball valve off the pipe with a crescent wrench, the entire assembly simply screwed right out of the hull! This thru-hull might be the easiest change ever.
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  #29   IP: 108.222.217.217
Old 05-22-2013, 04:29 PM
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Bronze thru hulls

I am in the process of changing the cockpit drain thru hulls on my Bristol 27. Mine consisted of 1 1/2" OD FRP tubes from the cockpit sole to 1" brass ball valve and thru hull. To make matters worse, someone had cobbled a plain steel pipe connector and steel nipple to the ball valve to get the diameter up to the 1 1/2" ID hose. Finding all this was a bonus for removing the engine to work on in the shop over the Winter.
Everything I have taken apart has needed it. To be taken apart. Plus, it's fun.
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
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  #30   IP: 173.53.23.94
Old 05-22-2013, 05:13 PM
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Here's how I removed my through-hulls.

I took an angle grinder with a metal-cutting disk and cut through the outer ring of the mushroom, as so:



It was then extremely easy to take a hammer and cold chisel and snap those little pieces off, leaving just the little metal sleeve of the through-hull going through the hole in the hull - and actually, once I snapped off the outer pieces, that little metal sleeve fell off inside the boat:



I then had the yard grind down and glass over the two holes that were left behind. You almost can't even tell they were ever there.
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  #31   IP: 24.224.152.244
Old 05-22-2013, 08:03 PM
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Smile 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.
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Last edited by Mo; 05-22-2013 at 08:43 PM.
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  #32   IP: 68.56.139.11
Old 05-22-2013, 08:21 PM
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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.
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  #33   IP: 8.22.0.49
Old 05-23-2013, 09:19 AM
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Quote:
Originally Posted by hcrisp View Post
...
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
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  #34   IP: 71.200.119.246
Old 05-23-2013, 10:08 AM
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Quote:
Originally Posted by roadnsky View Post
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
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  #35   IP: 184.0.104.8
Old 05-24-2013, 12:32 PM
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Quote:
Originally Posted by Hymodyne View Post
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.
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  #36   IP: 71.200.119.246
Old 05-24-2013, 02:38 PM
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Many thanks Jerry.
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