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 Catalina 25 Specific Forum
 Old Moter mount holes		  New Topic  Topic Locked
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BruceL
1st Mate

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USA
30 Posts
Initially Posted - 02/24/2008 :  11:52:54  Show Profile
I’m having a bit of a quandary about how the fill a sixteen holes left in the transom by the PO. What they are four different hole patterns left by old motor mounts. The ones that I am most concerned with are at or below water line and the holes are ¼ in diameter. The PO sealed the holes with some kind of soft silicone and put bolts back in the holes (looked terrible) and I’m pretty sure were leaking. I have two thoughts about how to seal the holes and just wanted a little input. First is to just fill the holes with Marine-tex at first thought pretty simple but its going to be pretty hard to put a temporary backing plate in so the Marine tex doesn’t fall out the back side. My next thought is to epoxy some ¼” dowels in the holes and set them back into the hole and than use the marine tex to cover the holes this way the hole is sealed and I’ll only be filling a small hole. If anyone has some other ideas I’m open to any help.
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dmpilc
Master Marine Consultant

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USA
4593 Posts
Response Posted - 02/24/2008 :  13:48:43  Show Profile
Using the dowels sounds like a good idea. When I replaced the motor mount on our boat, I filled in the old holes, fortunately only 2 and above the waterline, with silicone, covering up the holes on the inside with a few layers of duct tape. Unfortunately, that restricts the air flow to the silicone, making it take longer to cure, but it does work. Since I used a backing plate of 1/2 in. Starboard between the motor and the transom, the old silicone-filled holes were covered up as well, so it wasn't too important how it looked, only that it not leak. Time will tell on that issue. Note, I also used a Starboard 1/4 in. backing plate on the inside.
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 02/24/2008 :  22:33:30  Show Profile
If you are making a permanent repair, use epoxy. Over drill or dremel the inside of the holes to expose clean substrate and fill with epoxy putty or epoxy mixed with glass strands. If you want to use dowels, thoroughly coat the inside of the enlarged holes and the dowels with epoxy and press in. After a day or two, wipe with acetone and finish with gelcoat.
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sweetcraft
Admiral

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USA
816 Posts
Response Posted - 02/24/2008 :  23:54:42  Show Profile
Made plugs of Starboard with plug cutters of different sizes and 3M 5200. 3 seasons so far.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 02/25/2008 :  07:57:25  Show Profile  Visit Frank Hopper's Homepage
I used thickened epoxy and duct tape to keep it in place while curing. I also then added a starboard reinforcing board which hid the hole repairs.
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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts
Response Posted - 02/26/2008 :  10:07:53  Show Profile
I did as Frank suggests but used Marine-Tex. The stern is a full 1" thick so the starboard is optional but it does make for a nice clean installation.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 02/26/2008 :  12:03:54  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by BruceL</i>
<br />I’m having a bit of a quandary about how the fill a sixteen holes left in the transom by the PO. What they are four different hole patterns left by old motor mounts. The ones that I am most concerned with are at or below water line...<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

Bruce,

If your motor mount holes on the transom are below the waterline, turn your bilge pump on immediately.
Edited by - dlucier on 02/26/2008 12:04:53
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.