unusual stringer repair question

Questions about boat repairs with our resins and fiberglass: hull patches, transoms and stringers, foam, rot etc.
keysrat
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unusual stringer repair question

Post by keysrat »

I pulled the B-W marine transmission on my SeaVee yesterday. The motor, a small block Chevy, is mounted amidships, under the center console.
Anyway, we had to remove the transmission mounts to get the thing out. The mounts were held in place with 1/2" lag bolts into the stringers. The stringers on this thing are huge. 8O
The lag bolts were in poor shape and will be replaced with stainless steel units. The hole in stringers had a bunch of powdered rust in them, but the surrounding wood appears to be solid.
Down here in the Keys, folks usually soak an oak dowel in epoxy, drive it down in the bolt hole, let it cure, and then re-drill the hole.:doh:
I will likely replace the ancient mounts the boat had in place with modern ones, so the new mounting holes may or may not be in the same place.
My question: Is there a better way to do this?

Now, the bad part- When removing the transmission, the crane bumped the exhaust system, which promptly dumped water down one of the bolt holes. I vacuumed out the water, but i still have a mess of damp, rust dust goo down that hole. I have tried using a hair dryer to dry it out, but the hole is a good 5 inches deep, so it is still damp in there. I don't want to drive a dowel in there while it is still wet.
Ideas?
Last edited by keysrat on Fri Sep 20, 2013 2:48 pm, edited 1 time in total.



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FitzFisher
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Re: unusual stringer repair question

Post by FitzFisher »

You could rig up a small nozzle on a vacuum and let it run for a while. How about filling the hole with some epoxy thickened with milled fibers? That should hold a lag pretty darn good. After the vacuum I'd put a lamp on it to help dry it out.

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Cracker Larry
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Re: unusual stringer repair question

Post by Cracker Larry »

What he said above ^^ is what I'd say too.
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keysrat
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Re: unusual stringer repair question

Post by keysrat »

I thought about thickened epoxy, but wonder if I can get it all the way to the bottom of the hole, without leaving a void.
I suppose "slightly" thickened epoxy might work?

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FitzFisher
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Re: unusual stringer repair question

Post by FitzFisher »

it doesn't have to be too thin. Use a thin stick to work it down in the hole and the air bubbles will work their way out. get it to where it will just pour and oiit will follow in fine. You want it wet enough to bind well and I would also work some resin in the hole first with a small paint brush to prime the wood for the bond. That will work like a champ!
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Re: unusual stringer repair question

Post by NOTHING ELSE MATTERS »

Are those holes on top of the stringer or on the side?

keysrat
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Re: unusual stringer repair question

Post by keysrat »

The top.

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tech_support
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Re: unusual stringer repair question

Post by tech_support »

milled glass with some chopped glass mixed in is thin enough that air bubbles will work their way out. Make the pour in several stages (dont want to start a fire) :)

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Re: unusual stringer repair question

Post by keysrat »

To what consistency should I mix this?

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Re: unusual stringer repair question

Post by tech_support »

pretty thick or else the milled fibers will settle out.

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