"Wet transom" vs "rotten transom"

cmjust0

Seaman
Joined
Aug 14, 2002
Messages
52
Hey guys.. I've owned my 1992 Astro bassboat w/ a 70hp Force since 2002.. It was faded pretty bad and the carpet had been replaced before I bought it, so I knew it saw some weather.. It's seen *a lot* of weather since then, too...like, the last four years worth, sitting out in the weeds. To my credit (if you can call it that) I at least put the nose way up, trimmed the motor way down, kept the plug out, and checked it periodically to make sure it still was able to drain, etc..

Even back closer to when I first bought the boat, I noticed that the motor mount would chatter against the transom and I'd get water leaking in through the motor mount bolt holes occasionally.. I'd just tighten it up and move on with life.. Well, after it sat for 4yrs, I took it out and noticed it leaking and chattering again, so I tightened it up.. This time, however, I *really* cranked the nuts down and it kinda oozed a few drops of water out from behind the motor mount.. I did a search about it and saw a post where someone was having water intrusion there and the response was "Your transom is rotten."

Needless to say, that kinda worried me, so I did some more research and found that there's some debate as to whether a "wet transom" and a "rotten transom" are the same, and also on how big a deal it is if your transom it wet, when to start getting really worried, etc.. What I've seen so far are people talking about the glass cracking and transom bowing out, being unable to trim the motor because the transom flexes, etc.. I haven't experienced *any* of that..

In fact, I know that if I trim my motor too far down with the boat strapped to the trailer, the skeg will make contact with the ground and begin pulling the trailer backward and lifting the whole boat/motor/trailer off the ground -- but the transom doesn't flex at all.

So, I guess I'm just looking to get a discussion going here on "wet transoms" vs. "rotten transoms" and so forth, what people have seen first hand (as in, motors falling off, transoms being ripped off, people keeping transoms alive with brackets and homemade road-sign plates and 2x6's, how long they ran on wet/rotten transoms, etc)..

Thanks! :)
 

oops!

Supreme Mariner
Joined
Oct 18, 2007
Messages
12,932
Re: "Wet transom" vs "rotten transom"

a wet (soaked) transom is a rotten transom in a short while.......

here at i boats, we really dont have a time line on the process, i have heard 6 months. but i have also seen 3 years.

however....if your transom was wet....and the boat sat for 4 years.....then there is a good chance that the rot is well thru the transom......

the proper way to replace it is only a little work....and its done forever
 

jigngrub

Fleet Admiral
Joined
Mar 19, 2011
Messages
8,155
Re: "Wet transom" vs "rotten transom"

A wet transom is an adolescent rotten transom, it isn't going to dry out and it isn't going to get better.
 

redfury

Commander
Joined
Jul 16, 2006
Messages
2,657
Re: "Wet transom" vs "rotten transom"

Agree and agree. The other issue is that the wetness of the transom is only going to cause what bond the outer fiberglass skin of the boat had with the transom to eventually fail and potentially cause spiderwebbing or actual stress fractures in the fiberglass skin.

Of course, this is all with time, and how much abuse the boat sees, etc. The rot doctors website claims that you can drill a bunch of holes in the transom, put tubes in them, connect them to a shop vac and then run the shop vac and pull the moisture out and then let it dry, then put in their thinned out epoxy and fix that transom.

I was drawn into the idea of it until I really did some reading here and what people have had work and not work. What works? Replacing the transom, regardless if it's seacast or wood.
 

Yacht Dr.

Vice Admiral
Joined
Feb 26, 2005
Messages
5,581
Re: "Wet transom" vs "rotten transom"

Wet wood that is NOT rotted is still sound IMO .. ( I am assuming that your not like water logged ;) ).

I can take my moisture meter on all of the boats in this marina and find High elevated levels .. 80% will read HIGH.

It does not mean its Failed.

Now if the Glass has failed off of the wood then yea..no good.

Nice wet wood is a sign of things to come. Its not Right now freak out time :)

Should call this thread "Failed transom VS. Rotted transom VS. Wet transom"

YD.
 

oops!

Supreme Mariner
Joined
Oct 18, 2007
Messages
12,932
Re: "Wet transom" vs "rotten transom"

the above is correct........but the key quote...is......"a sign of things to come"

since you are in there.......any how. do a core sample......if its dark......the fungus has started
 

cmjust0

Seaman
Joined
Aug 14, 2002
Messages
52
Re: "Wet transom" vs "rotten transom"

So, presuming I were to core it and find a lot of rotten wood, what's the process for fixing it? I've seen some examples where people come in from the top of the transom and basically 'scoop' out rotten wood, then either pour the void full of some type of epoxy or plink a new piece of wood in and seal it back up, etc.. Does that sound about right?
 

Cadwelder

Lieutenant Commander
Joined
Aug 30, 2010
Messages
1,780
Re: "Wet transom" vs "rotten transom"

So, presuming I were to core it and find a lot of rotten wood, what's the process for fixing it? I've seen some examples where people come in from the top of the transom and basically 'scoop' out rotten wood, then either pour the void full of some type of epoxy or plink a new piece of wood in and seal it back up, etc.. Does that sound about right?

Well hollowing it out and inserting new wood is not an option at all, it won't work. As far as the pour in stuff, many here have used it with success, personally I don't care for it.

But lets see how the core samples work out before we get to head over heels.

I currently have a 92 Astro in my shop doing a full restore, and have plenty of pictures if you need any of them for reference.
 

oops!

Supreme Mariner
Joined
Oct 18, 2007
Messages
12,932
Re: "Wet transom" vs "rotten transom"

as far as dropping a new piece of wood in there.....well thats kinda how its done.......but there is more to it.....if you drop a piece of wood in there.....be prepaired to replace it again in the near furure.

click the link in my thread for transom instlation instructions.....its in the index
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
50,373
Re: "Wet transom" vs "rotten transom"

I fixed one of my early boats with seacast and a whole bunch of fiberglass. what was 1.5" of wood with 2 layers of fiberglass on the inside and .2" thick outer layer turned into .4" outer layer, 1.2" of seacast and .3" thick inner layer. it took time, and when all said and done, was stronger than the original.

wet wood as many have stated is the start of a problem. fix it soon while on dry land so you dont have to mcgyver a solution while out on the water
 
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