268 weekender transom rot (contains high resolution pics)

[tobnpr]

KC is there another name for Bi-Lateral cloth? I use jamestowndistributors to get my epoxy resin and such. I'm getting ready to place an order for more resin and was going to get the cloth also. I found plain 10oz cloth on there site but i can't seem to find the other cloth. Also i'm going to use 1/2 exterior grade 4 ply plywood to get my 1 inch and 2 inch thickness that is needed. None of the local lumber yards around here carry marine grade plywood.

First, find the marine plywood. They may not stock it, but it's easily ordered.
This is one application where marine ply is a MUST.
Marine plywood is void free- CDX is not, and you have no way of knowing where the voids are. Should there be voids where the transom plate bolts to the transom, the thrust from the outdrive could crush the transom.

Generally, transoms are constructed from 2 layers of 3/4" marine ply, with glass in between them. Once fully glassed and finished, you end up with about a 2" transom.

 

[lime4x4]

I'll ask the local lumber yard if they can get me marine plywood. I have another question about stringers. Needless to say my stringers are water logged and one is broken. I thought stringers ran from the stern all the way to the bow. Mine are only about 5 feet long

 

[Henry Boyd]

The stringers are there mainly to support the engine(s) drive/transmissions. They may be directly under the engine and act as mounting points for the engine mounts, or may be installed just as ribs to support the hull in the vicinity of the engine. Their position depends on the engine type/size/qty of the hardware.

Henry

 

[berth control]

On a boat with I/O's the engine mounting stringers are holding the engines from rotating and vibrating from their own torque, the transom holds the thrust from the motors. On an inboard boat the stringers hold the motors and the thrust, so they will be bigger than the ones on your boat. There will be stringers that hold the boat together and add rigidity, they don't all hold in the motors.

 

[lime4x4]

Should i replace the foam or just keep it out? I really don't want to put foam back in and have get all water logged again. Or is the pourable foam water resistance?

 

[Spookeay]

Put the foam back in. If you seal it and take care of it, it will stay dry for years and years. If there is ever a breach or the pumps fail it will go to the bottom.:wow:

 

[lime4x4]

The local lumber yard said they can order marine plywood.75.00 bucks a sheet. He was saying they also carry a good grade of plywood that is just as good as marine grade (void free wise) for 40 bucks a sheet.

 

[SCORPIO]

What type of glue, exterior I hope? Also, how many plies?

 

[lime4x4]

7 or 9 ply exterior grade.

 

[keokie]

The foam is there for a few reasons. One is floatation. Although, your boat does not have a requirement to float if it sinks. Another reason is sound deadening. But the biggest two are strength and to eliminate an area where gas fumes can accumulate.

 

[lime4x4]

If redoing the stringers out of plywood i assume i should use 3/4 inch and have the peices running vertical?

 

[lime4x4]

after 30 hours the boat is ready for new transom and stringers

 

[trit21]

Wow, I don't know much about the job you had to do but from the beginning pictures to the above pictures, that looks awesome. I hope some with more experience and knowledge will chime in as well. Looks like you glassed the entire bilge area.

 

[lime4x4]

Thats just some raw fiberglass from pulling up the 1/4 inch thick bilge belly

 

[lime4x4]

The transom is cut and ready for me to epoxy it together. Also i've attached pictures of my idea for the stringer replacement. The dark one is the original stringer.

 

[BonBini]

Lime4x4: Great photo's and thanks again for the info on core sampling my boat.

The old truck hiding behing the tree? I've got a 47 Ford myself :grin: ...Ron

 

[lime4x4]

Anytime. It's a 1947 dodge pick up truck..My next project!!

 

[Henry Boyd]

Lime,

The old stringer looks like it is made from oak. The multi piece replacement looks like it is made from pine. I gather this is an engine mounting point, or some other weight carrying application?

My suggestion would be to get some oak for the replacement stringer. You may have to search around for a specialty hardwood supplier, as your local lumberyard may not have anything. For a weight bearing application you should go with one piece, and if not then laminate several pieces together using a good water resistant glue, i.e. Gorilla Glue, epoxy. Do not use yellow, or brown furniture glue, it won't last.

Henry

 

[lime4x4]

I will c what my local lumber yard can do for me. It was one solid peice of something. The only thing that mounts to it is the engine. I thought the glass actually provided the strength? The glass was 1/4 to 1/2 inch thick over that stringer. Where the motor mounts the glass was almost 1/2 inch thick. I agree i would like to make it out of one peice. But i've never seen lumber in that size

 

[douglee25]

I second Henry's suggestion. Lumber yards can special order just about any material. Because the piece is so thick, laminating smaller pieces (maybe 3/4") with epoxy may be a better option.

Doug