Author Topic: I think I broke my transom. HELP!!  (Read 16747 times)

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Offline Joe Pivonka

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I think I broke my transom. HELP!!
« on: May 08, 2014, 07:15:43 PM »
I guess that the transom wasn't as solid as I thought. Any suggestions about what I should do so I'm not off the water all season? After checking from the inside, the wood does need to be replaced.
1980 SSV-169
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1997 Mercedes Benz SL320

Offline Jason

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Re: I think I broke my transom. HELP!!
« Reply #1 on: May 08, 2014, 07:52:59 PM »
oh no!! That is really sad to see. Bummer......

Well, there is no shortage of information on here for replacing transoms.

http://forum.cgoamn.com/index.php?topic=4062.0
Jason S.
1974 Glastron Carlson CV16SS 140 I/O
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Offline Plugcheck

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Re: I think I broke my transom. HELP!!
« Reply #2 on: May 08, 2014, 10:04:51 PM »
      Just an opinion as I'm no expert, but can you pull the transom bolts and put longer bolts through yet another layer of ply inside to help make the load bearing surface wider?     I would suggest a 1/4" aluminum plate on the outside, but not sure if you supported the engine, would it give enough room to slide under.  A temporary fix at best.    Sorry to see it, especially at this time of season.   Hope to see it out this summer.
Michael
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1980 CVX-16SS 140 Mercruiser
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Offline Joe Pivonka

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Re: I think I broke my transom. HELP!!
« Reply #3 on: May 08, 2014, 11:24:07 PM »
I did consider just the patch for this summer. I'll have to see the damage when I get it pulled apart.
1980 SSV-169
Yamaha XL1200 Waverunner
1960 Chevrolet Corvair 900 Monza
1997 Mercedes Benz SL320

Offline Hyperacme

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Re: I think I broke my transom. HELP!!
« Reply #4 on: May 09, 2014, 12:51:39 AM »
Very bad time of year for that to happen.
Might be some stringer and floor problems also ...
NOT GOOD !

I'm not a fan of "Quick patch to get it through the summer".

Offline Jerry

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Re: I think I broke my transom. HELP!!
« Reply #5 on: May 09, 2014, 02:08:23 AM »
Me either, BUT ya can do an outside transom replacement for now then tear the inside apart over the winter.

First get a piece of 1/8" hardboard and clamp it to the outside of the transom. Take a router with an edge bit and cut all around the outside. That's your pattern for the transom. next with a cutoff wheel cut the fiberglass on the outside about 1" from the edge. Clean everything out and sand down the inside fiberglass. Get a piece of 3/4 external grade plywood (NOT MARINE) and cut 2 pieces of transom 1/4" smaller than the pattern. put a coat of resin on both sides and screw them together. (don't put the screws where you have to drill) You don't need anything in between the layers



Now fit it in the space you took the old wood out of, when you know you can slide it in without a problem put a layer of mat on the inside fiberglass, and then a bead of bondo with A little MEKP for a hardener the bondo hardener will set up to fastnad slide the new transon in, clamp it where you can and run a couple screws in from the inside (you can remove the screws after it sets and fill the screw holes



A layer of Bi-axel cloth /with mat over that and a second layer of regular glass cloth over that and around the edge (sides, bottom and top) you will have to do some body work on the sides to make it look right



You can get everything from Express Composites, and Budget power. A weekend (or two) and a couple hundred bucks and yer running
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Offline Hotwired

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Re: I think I broke my transom. HELP!!
« Reply #6 on: May 09, 2014, 08:33:11 AM »
Ahhhh ... In other words, no.  There is no "easy" fix that will do you well.  Problem is, the material inside the glass is soft.  Anything you put on each side of it will compress the middle more and continue to flex and do more damage.   The rotted transom needs to be replaced with solid wood.  Repairing the small area where the engine is mounted is a relatively small portion of the work to be done.   The wood transom extends across the back of the boat side to side to distribute the load of the engine of course.  Unlike a stern drive the entire wt of the engine and the forces created by it are all impacting the transom.  That load needs to be spread out across the transom not just where the engine mounts.  And as mentioned, the stringers are usually in the same shape as the transom.

A transom plate would cover that area where the damage is.  You will need a large plate or a piece of steel angle about 6 inches longer than the span between the bolts on the inside of the transom as well.

Lots of people to help here.  The news is grim this early in the season.   :'(
.. it is what it is ... and that is how it should be!
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Offline David CVX-16

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Re: I think I broke my transom. HELP!!
« Reply #7 on: May 09, 2014, 08:50:22 AM »
Before I bought my present CVX-16, there was another CVX-16 being sold by a boat repair shop without the engine. Same type of damage - the bottom of the motor mounts broke through the fiberglass. Beautiful boat but they estimated upwards to $3,000 for them to fix it. Calling White Bear Boatworks and describing the damage to Jason Brown, he estimated a fix from the outside at $2,200.   
« Last Edit: May 09, 2014, 09:24:19 AM by David CVX-16 »
David
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Offline MarkS

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Re: I think I broke my transom. HELP!!
« Reply #8 on: May 09, 2014, 09:05:34 AM »
Sorry to see that Joe, but at least you got her home right!?  (Could have gone a lot worse, taken out a chunk of the transom and/or lost the OB)

I know the preferred way to replace a transom is from the inside, but in cases like this I was thinking the external replacement method might be better as well.  It may take a little more work on glassing and gel coating the outside, but since there's repair work to be done there anyway......?
Mark
1978 SSV-176

Offline bellj

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Re: I think I broke my transom. HELP!!
« Reply #9 on: May 09, 2014, 01:16:51 PM »
I noticed wood like plywood being mentioned a few times - and I've been lucky enough to not have to do this repair myself (yet) - but wouldn't this be the type of job where SeaCast is supposed to be a good alternative to wood that always eventually gets damaged by the water?

Maybe it's since been proven different, but I always thought SeaCast had good reports from people (including on this forum) who've repaired with it - but as I said, I've never used it - so maybe I'm not getting the full picture.   :)
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Offline V153

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Re: I think I broke my transom. HELP!!
« Reply #10 on: May 09, 2014, 04:23:10 PM »
I did the 153 with all composite(s). Transom, stringers, floor, etc. Only place I used the pourable stuff was to squish/seat the new transom into the hull. I hear you can pour entire transoms, etc with it but have no personal experience.
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Offline WetRaider

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Re: I think I broke my transom. HELP!!
« Reply #11 on: May 09, 2014, 04:25:35 PM »
I had a week transom on mine when I bought it.  PO had replaced the transom, but used Liquid Nails instead of fiberglass and the wood structure separated from the fiberglass hull.  I tried a temp fix - had a 3/16" aluminum transom plate made that was a full wrap-over …. all it did was protect the transom and glass from further damage at the mounts, but allowed the damage to continue at the edges of the wrap-over plate.  In the end, the whole splash well lip at the transom peeled off the boat. 
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Offline Jerry

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Re: I think I broke my transom. HELP!!
« Reply #12 on: May 09, 2014, 05:40:57 PM »
Just my thought, These boats lasted 30-50 years, without much protection, with wood transoms, In 50 years I won't care if it needs to be replaced again. My '58 FireFlite has the original transom. I'm not sure why, but this hobby of restoring old boats tends to turn everyone into a Marine Engineer.
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Offline Joe Pivonka

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Re: I think I broke my transom. HELP!!
« Reply #13 on: May 09, 2014, 05:56:51 PM »
I am hearing all that is said. I think I will have to check out the damage when I get the motor out but I am guessing that I will pull the floor at the same time. I was going to do it eventually so I may as well get it all done now. I have never replaced a transom so that will be new. What is recommended to get the old wood out? I don't want to cut the back of the boat. The gelcoat is in great shape and I don't want to mess with that. I am planning on going in from the inside.
1980 SSV-169
Yamaha XL1200 Waverunner
1960 Chevrolet Corvair 900 Monza
1997 Mercedes Benz SL320

Offline Hyperacme

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Re: I think I broke my transom. HELP!!
« Reply #14 on: May 09, 2014, 06:01:04 PM »
Is it just a small piece of wood like a GT150/CVX16 ?
Or full width ?

Gt150 transom ..



CV16 full width ...



You could cut and dig all the old wood out and try to slip a two piece transom wood between splash well and outer fiberglass.
You wouldn't have to split deck then.
If wood is full width it would be harder ... But has been done ...

I used a "Oscillating Multifunction Power Tool " to get old wood out ..
http://www.harborfreight.com/power-tools/oscillating-tools/oscillating-multifunction-power-tool-68861-8493.html
« Last Edit: May 09, 2014, 06:05:41 PM by Hyperacme »

Offline Joe Pivonka

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Re: I think I broke my transom. HELP!!
« Reply #15 on: May 09, 2014, 08:02:29 PM »
Thanks for the pictures Gregg. Can you email me any more from the GT150? Like when it is out or anything else? That might help me out so I can understand how it all fits together. The transom is a smaller one like the GT-150. I tore into it tonight and here are some pictures. It looks like the new floor is just set in place and maybe caulked or glued in on the sides but it is brittle and adds zero structural rigidity. It is coming out too. Not sure on the stringers but they seem original. Crap.  I may as well go "all in"!
1980 SSV-169
Yamaha XL1200 Waverunner
1960 Chevrolet Corvair 900 Monza
1997 Mercedes Benz SL320

Offline Hyperacme

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Re: I think I broke my transom. HELP!!
« Reply #16 on: May 09, 2014, 08:20:59 PM »
Go over to the CGOA site and look through some of the GT and CVX rebuild threads ...

http://www.classicglastron.com/phpbb/viewforum.php?f=28
http://www.classicglastron.com/phpbb/viewforum.php?f=34

Marks  GT thread ...
http://www.classicglastron.com/phpbb/viewtopic.php?f=28&t=4433

That transom looks bad ...

Offline Jerry

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Re: I think I broke my transom. HELP!!
« Reply #17 on: May 09, 2014, 08:22:06 PM »
Good choice Joe. Do it right the first time.
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Offline V153

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Re: I think I broke my transom. HELP!!
« Reply #18 on: May 09, 2014, 09:31:17 PM »
Composites ain't for everybody. But in my case I'd definitely do it again. And I will with the C-500. She's a lot less complicated than a 153. Transom, keel stringer & floor. That's all there is to it.

Don't forget you can shape the stuff with a razor knife, file, & a piece of sandpaper. Plus it'll never absorb water, ever. It don't care if you drill a hole through it or drive a screw into it. Resin sticks to it like flypaper. Factor in the weight savings, doubt the 153 was much over 450lbs dry.

Those who's mantra is "It lasted 40 years with wood so why use anything else?" are beginning to sound like a broken record. Yeah it'll work just fine I reckon. But why not take advantage of the latest technology? In the long run it ain't all that much more expensive.

Well, less'n ya smash it into a channel marker afterward ...  But I will tell you this: That stringer/floor system was so rigid that the only place the floor delaminated was on the opposite side of the boat from the point of impact!?

I think you're doing yourself a disservice if you don't at least consider using the stuff during a rebuild.
'81 C500_given away, bought back_75.1 mph
'81 Baja 15SS_140 Frankenrude_66.7 mph
'70 something SpeedCraft_(Allison 16R Clone)_69.0 mph
'79 CVZ19_given away
'71 V153_54.8 mph_wrecked


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Offline dorelse

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Re: I think I broke my transom. HELP!!
« Reply #19 on: May 09, 2014, 10:47:34 PM »
Seacast in my transom...loved it and would use it again for the transom & stringers next time.
1990 Sierra 1700