JC Cosco bay tanks replacement

LACI GALE 31jc

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photo (9).jpg [/ATTACH] This is the plan remove washrail and casco bay cockpit liner than remove tanks. hopeing to finsh in three weeks . here are some pic of day one.

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LACI GALE 31jc

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Day two casco bay liner and tanks out. tomrrow we lift tank out and off to Ram welding . Tanks size 86"x29x11""-7" . than back to boat to startcleaning up foam and glass.

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CaptDave

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Wow, looks like you are moving right along and good luck with the project. I know the feeling and once done you will be good for many many years.

Dave
 

Field Tester

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Just out of curiosity, what caused the tanks to fail?? There shouldn't be any water near them because of where they placed. Mine still look new. (Built in '97) Was it due to how they were installed? Or did they rot from the inside out?
 

LACI GALE 31jc

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photo (12).jpg My boat was made in 1984 . the tanks was laid up on foam and full of fuel and water. i also found some oil dippers glassed under both tanks. And on the port side of the fish hold there was a sub wall glassed in you can see oil stain on left side of pic. Check out the fill hose the brass nipple was glue to the tanks and it came off in my hand . Took the tanks to the builder and when he saw how the fill pipe he said "WHAT THE F---". I pulled most of the foam up with a wonder bar than i am using a wire wheel a die grinder. " sw wash down was on top of port tank" Day three. check out tank fill in post # 4

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LACI GALE 31jc

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photo (21).jpg Day four ,more cutting and grinding. It was too hot to work in the boat so i went up to home depot and picked up a day labor he worked his ass for three hours then the rain came that's when i called it a day and gave the kid $100 . A fiberglass guy who was working two boats over showed me a piece of "MDO" board i might use it to replace the balsa wood on the gunwale has an one hear of it or used it.

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Field Tester

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Wow, you're boat looks a lot different than mine!! I have longitudinal stringers and then there is like a platform on each side that the tanks sit on. No foam. There is a rubber mesh that the tank sits on and they are just strapped down. I guess the rubber mesh is suppose to allow any water to drain if any got in the tank area.

Regarding MDO, I have used it before, but I don't think it's a good choice for the gunnel. Its basically just plywood with an overlay of a paperlike material so that it paints well. I would use either a marine plywood, or go composite with coosa or penske board.
 

LACI GALE 31jc

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Wow, you're boat looks a lot different than mine!! I have longitudinal stringers and then there is like a platform on each side that the tanks sit on. No foam. There is a rubber mesh that the tank sits on and they are just strapped down. I guess the rubber mesh is suppose to allow any water to drain if any got in the tank area.

Regarding MDO, I have used it before, but I don't think it's a good choice for the gunnel. Its basically just plywood with an overlay of a paperlike material so that it paints well. I would use either a marine plywood, or go composite with coosa or penske board.


My first choice was coosa or penske board. what size tanks do you have and how high are the stringers ? I was planing to coat the tanks with cold tar epoxy than foam in tanks at the ends and the middle .
Thanks
 

MouseTrap

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Strong work!

Not to be too far off topic, but I love seeing the clam boat in the background of first pic of the gunwale repair. I grew up and lived on the South Shore of Long Island for 30 years. You don't see LI clam boats outside of that area (and there's probably not that many left if the area unfortunately).
 

Field Tester

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Here is a picture of mine when the boat was built. I have 2 80 gal. tanks. The tanks don't really sit down inside those stringers. The platform is about 1/2" lower than the top of that stringer. The stringers are maybe 5" tall? I replaced tanks in another boat once and what I did was I glued neoprene strips that were about 1/4" thick to the bottom of the tank with 5200 and just strapped the tanks to the hull with stainless straps. I also used the neoprene strips between the straps and the tank. This gave good air flow around the tank which is key. You want that moisture to dry. Once that foam gets wet, it's wet forever! Coal tar is great stuff! I hear it sucks to work with though.



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BillD

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My first choice was coosa or penske board. what size tanks do you have and how high are the stringers ? I was planing to coat the tanks with cold tar epoxy than foam in tanks at the ends and the middle .
Thanks

Three points:

1. Great project thread with pics and explanantions !
2. You have your hands full !
3. You and your crew are moving right along !
 

LACI GALE 31jc

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Day six finish grinding the gunnal than glassed in some fiber glass on some of the rod holder holes and the weak spots.


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Blacktide

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Good work brother ! Maybe you can post my project too since you have all the pictures! Lol I'll stop by on Wednesday to check up on you.
 

LACI GALE 31jc

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Today we picked up coosa board, glass and resin. Cut and dry fit coosa board in the gunnal i hope to glass it in tomorrow photo (33).jpg

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