Looking for I/O Transom Rot Repair Suggestions

soaked

Cadet
Joined
Jul 5, 2008
Messages
24
I have a 1979 Carver that was abused by previous owners, who failed to adequately protect various thru-transom holes (for things like a swim deck, transducer cable, etc.). There must be over 30 holes under 1" in diamter, spread across the transom, and I believe many of them have at least some amount of rot. I have verified this by pushing a 16d nail into the wood-core, in various directions. In most cases, it sinks about 2inches, before hitting good wood. In some places, it is worse. I suspect most spots extend between the inner and outer glass skin.

I am also in the process of converting this boat to an outboard, which means I need to fill in the I/O cut-out anyway (which does not have any rot that I can detect by the same method). As I contemplate the conversion, and the existing rot condition, I want to look hard at the extent of rot in the transom before going any further.

I have seen transom repair threads that suggest cutting off the top of the glass cap from the transom, then digging out the bad wood and filling with resin type core. This seems very intensive for this boat (not an outboard already) and for what may be just many small, isolated pockets of rot in my transom (rather than extensive rot throughout).

I was wondering if it would be worth trying to remove the outer fiberglass skin, to access the wood core and visually inspect all the suspected rot-spots from the outside, then dig them out and treat them just like i would the I/O cutout that has to be filled, the re-skin the entire transom, gel-coat, etc.

Any feedback would be most appreciated. I have pics, if desired.
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,956
Re: Looking for I/O Transom Rot Repair Suggestions

I was wondering if it would be worth trying to remove the outer fiberglass skin,

Ayuh,... I Wouldn't,... That's the Last way to get there....
 

proshadetree

Lieutenant Commander
Joined
Jul 19, 2008
Messages
1,887
Re: Looking for I/O Transom Rot Repair Suggestions

Well I will sorta agree with Bondo. How much different will your transom be with the outboard? Is it cracked up now? Lot of variables and pics and more info will help cure some of them.
 

Cadwelder

Lieutenant Commander
Joined
Aug 30, 2010
Messages
1,780
Re: Looking for I/O Transom Rot Repair Suggestions

Replacing a transom from the inside is by far the best way, but since you're going to have a ton of holes to repair including the large I/O hole it might be a toss up. I still think I'd go from the inside.
 

Bifflefan

Commander
Joined
May 27, 2009
Messages
2,933
Re: Looking for I/O Transom Rot Repair Suggestions

Since you are changing to an O/B anyway, (cant even begin to guess why) open up the inside of the transom as much as you can and dig it out. As long as you get past the stringers you will be fine, and up as high as you can.
Im am going to "assume" that you are going to add a platform of some sort to mount the O/B on, as cutting down the transom would not be a good choice.
Here is how I did mine, if I can get the pic to go in.
Make a jigsaw puzzle and glass and screw them together as you install them.
By the way, just because the wood is hard at the opening, it wount be good an inch inside of that.
 

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Yacht Dr.

Vice Admiral
Joined
Feb 26, 2005
Messages
5,581
Re: Looking for I/O Transom Rot Repair Suggestions

Hello soaked and welcome to Iboats..

I for one am kinda leaning towards cutting the skin off as your thinking.

I think it will be faster and structurally better for an outboard mod.

Because the bonds of the inside glass are most likely fine to the hull..there is no reason to undo this ( you need the inside the strongest bond of all ).

Your outside skin is very important.. to redo your trans from the Inside ( where you cant see if you cut and gut the inside and see that trans skin anymore ) would be very technical. Transom clamps..good reglassing to the hull on the inside etc is certainly very do-able..but I think its a waste of time/money. The inside glass Does not need replacement.

I know Im gonna be the black sheep on this one..but outside trans replace/repair is how I would tackle this Mod.

YD.
 
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