i'd had a suspicion i had a leak this winter, and i finally caught my chainplates actively leaking after a recent heavy rainstorm. there is a little bit of rot visible right at the bottom of the deck around one of them. i'm going to have to fix this at the next haulout, so now is the time to figure out how to proceed.
i've read up a bit, and right now this is going to be my plan of attack:
- get the old chainplates out & construct new ones from them as patterns.
- do some exploratory surgery on the bulkhead to see how far the rot runs. at the surface rot does not appear to have extended much past the immediate point of leaking but I expect it to be worse than it appears once the chainplates are off.
depending on severity i will either:
a) replace the entire plywood panel. this looks straightforward enough, but involves a fair bit of furniture disassembly in the cabin.
or
b) if the rot is limited to a small area, cutting away ply-by-ply in a "inverse birthday cake" manner to clean wood from either side & treating with boric acid anti-rot. then glue new plies in, allowing significant lap joint overlap with each additional layer. i.e. the innermost ply is the smallest piece and each layer of ply is 1-2" larger then the one underneath it. depending on extent i'll probably lengthen the chainplate a bolt or two into virgin bulkhead.
- reinstall, using butyl tape as sealant around the deck penetrations.
does this sound about right? any words of advice? anyone had to do this repair on their yamaha 25?
i've read up a bit, and right now this is going to be my plan of attack:
- get the old chainplates out & construct new ones from them as patterns.
- do some exploratory surgery on the bulkhead to see how far the rot runs. at the surface rot does not appear to have extended much past the immediate point of leaking but I expect it to be worse than it appears once the chainplates are off.
depending on severity i will either:
a) replace the entire plywood panel. this looks straightforward enough, but involves a fair bit of furniture disassembly in the cabin.
or
b) if the rot is limited to a small area, cutting away ply-by-ply in a "inverse birthday cake" manner to clean wood from either side & treating with boric acid anti-rot. then glue new plies in, allowing significant lap joint overlap with each additional layer. i.e. the innermost ply is the smallest piece and each layer of ply is 1-2" larger then the one underneath it. depending on extent i'll probably lengthen the chainplate a bolt or two into virgin bulkhead.
- reinstall, using butyl tape as sealant around the deck penetrations.
does this sound about right? any words of advice? anyone had to do this repair on their yamaha 25?