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 Cutting out the to-hull		  New Topic  Topic Locked
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William Matley
1st Mate

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52 Posts
Initially Posted - 03/15/2003 :  21:15:33  Show Profile
I just wanted to pass along my method of removing the to-hull on my 80 SK. Perhaps it will save you an afternoon beating on the pipe with a sledge hammer.

I took a wooden dowel and trimmed it to fit inside the to-hull pipe hole and gently drove the wood dowel about 1 1/2 inches into the hole. Drive the wood plug, from the exterior of the hull, until it's flush with the hull. Then take a good grade hole saw, attach it to your hand drill and set the pilot hole drill into the center of the wood plug. Drill gently and the plug will act as a guide for the hole saw.

Now just cut out the whole pipe. This leaves a clean hole to drop your new thru-hull into. Then when your done you can get a great look at the old to-hull and perhaps it will look like mine, uncorroded, clean, and would have out lasted me!

Whole job took 20 minutes.


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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 03/15/2003 :  23:11:46  Show Profile
What did you use to remove the 'mountain' of resin inside the hull?

-- CB

Currently maintaining two holes in the water...'77 Venture 23 and new to the family,
'78 Catalina 25
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William Matley
1st Mate

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52 Posts
Response Posted - 03/16/2003 :  21:17:00  Show Profile
I used a small grinder I purchased from Home Depot to do the job. It took just a couple minutes to grind a flat spot large enough to seat the new thru hull bolt. A little 5200 and that's it.
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John Mason
Admiral

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USA
687 Posts
Response Posted - 03/17/2003 :  15:35:07  Show Profile
What? No backing plate on that through-hull?

John Mason
<img src="http://www.users.qwest.net/~jamason/ali.jpg" border=0>
pronounced "Ali Paroosa"
1982 - FK/SR #3290
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 03/17/2003 :  18:03:16  Show Profile
It might have even been Bill Matley's post that lead me to use the dowel method. Only problem I had was I must not have placed the pilot bit dead center as I ended up drilling through the wall of the to-hull pipe most of the way <img src=icon_smile_sad.gif border=0 align=middle> ! I also used a right angle (4.5") grinder to remove the build-up inside the hull - wear a mask! I used Life Caulk, and no, no backing plate here either.
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tinob
Master Marine Consultant

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USA
1883 Posts
Response Posted - 03/19/2003 :  13:53:25  Show Profile
Hi Bill,

I like your style...the dowel thing that is. I also appreciate your comment regarding the longevity of the to hull. I am a firm believer in the BAROQUE principle in maintenance. Each year I check the to hulls and give them a really good twist, and if they aren't BROKE I don't fix them. I also tie a plug at each fixture. <img src=icon_smile_approve.gif border=0 align=middle>

Val on the hard DAGNABIT

Val Bisagni]<img src="http://im1.shutterfly.com/procserv/47b3df11b3127cce94709c5ff2e90000000010" border=0>
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Mark Maxwell
Captain

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USA
329 Posts
Response Posted - 03/19/2003 :  17:37:06  Show Profile
<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote> What? No backing plate on that through-hull?<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>

As I understand it, a backing plate is really only needed when using a flush mount through hull as opposed to a mushroom head through hull.

<img src="http://www.chaplin-nest.com/unkarock/usflagwav.gif" border=0>
Mark-
'Impulse'
C25 #533 DINN/FIN ~_/)~
Bakersfield, CA.
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Douglas
Master Marine Consultant

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1595 Posts
Response Posted - 03/19/2003 :  19:35:55  Show Profile  Visit Douglas's Homepage
If the hull curvature inside is to great you can use a block of wood treated with epoxy. If your hull is already thick and built up just grind a flat area. <img src="http://im1.shutterfly.com/procserv/47b2dd00b3127cce9d5f16fa8ccf0000005610" border=0><img src="http://im1.shutterfly.com/procserv/47b2dd00b3127cce9d5f16028c370000005610" border=0>

Doug&Ruth
Triska (Alberg 29)
Tacoma Wa.
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John Mason
Admiral

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USA
687 Posts
Response Posted - 03/20/2003 :  13:04:24  Show Profile
You're probably right, Mark. I was kinda just heckling <img src=icon_smile_big.gif border=0 align=middle>.

But it's such an easy thing to do, I put backing plates on almost everything that goes through the deck or hull, even if it's just large fender washers for the stuff through the deck.

John Mason
<img src="http://www.users.qwest.net/~jamason/ali.jpg" border=0>
pronounced "Ali Paroosa"
1982 - FK/SR #3290
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OJ
Master Marine Consultant

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USA
4382 Posts
Response Posted - 03/20/2003 :  17:08:18  Show Profile
<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
. . . and if they aren't BROKE I don't fix them.
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>

Or as Red Green says, "if it ain't broke you're not trying!"
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
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