transom repair help

[rpower]

hi all,

I need help on my 74 fiberglass 18ft Chrysler tri-hull. I need to add a plate to the transom - I think.
the previous owner added height to transom to accommodate a long shaft motor (40hp Yamaha). he added a piece of wood to top of transom (see pic 1) and never finished the project.
I was going to add a 1/8 inch galvanized plate to cover the new piece of wood and overlap existing transom ( see pic 2).

the plate will be thru bolted in the center when I install the engine. the top 2 bolts will pass thru the new piece of wood.
the bottom bolts will pass thru the existing transom
the existing transom is fine, no rot.

pic 3 is looking down on splash well/ transom.
pic 4 is inside of transom.
pic 5 is yamaha long shaft engine (40hp)

how would I bond THE plate to THE transom ?.
how do I prep THE area OF BONDING . what adhesives do I use?
do I use clamps or ?
THE PROCESS ?



do i know what i'am doing !! no.

 

[Bob_VT]

Re: transom repair help

Welcome to iboats....

Was this boat used like that with a long shaft?

I would do a few things.

Uncover that metal in the splashwell and see what is beneath it. It looks to be very cobbed and I would want to know.

I would throughly seal the transom with an epoxy to prevent water intrusion into the wood.

I would also make a plate for inside the transom to spread the load. 1/8" is good for the inside.

Use stainless steel or aluminum for the plate...... no rust. I would tend to stay away from galvanized.

If you want spread a bead of 3m 4200 (3m5200 would be more permanent) on the plates and bolt through the transom with stainless steel bolts. It will not move. When you bolt your outboard on those (2 or 4 bolts) will also hold everthing in place. Use 3m 4200 in the bolt holes as a sealant.... if you use 3m5200 you will have a problem taking it apart someday.