Hello, I've been looking high and low for the size of the bolts and nuts that hold the lower shroud chainplates on a 36' 1989 mkI. I'll be rebedding them soon and want to replace the bolts as they have some corrosion. I might be replacing all the chainplates once I pull them depending on how they look.
Does anyone have the specs for those on hand?
We re-bedded ours and obtained the proper size with nuts from Fastnal. Pull one out and give it to them. It's important that you use bolts that have the same strength rating and are high quality SS. Make sure you use the correct screw driver as these bolts are torqed to a high level. I would not use the stuff from Home depot.
Bill Dolan 1990 Catalina C-36 MKI - Hull #1041 'Williwaw'
Std. Rig, Walk Through, Wing Keel
M35, Oberdorfer Conversion,
Home Waters; Charlotte Harbor & The Gulf Islands of Florida
'You are never out of work if you own a boat'
We replaced the standing rigging and re-bedded the chain plates about three years ago. The shrouds and side stays utilized stainless bolts measuring 2-5/8" in length and 3/8" dia. All I could find, measured 2 3/4"in length, so I had to shorten them a bit to ensure there was no gap between the regular nut and acorn nut inside the cabin.
My suggestion is not to go crazy torquing the bolts. I say this for two reasons. 1) The original bolts from the factory removed very easily and were not heavily torqued, and 2) You don't want to damage the deck core.
It appeared that the factory used polysulfide sealant for caulking so we used the same when rebedding. Be sure to cover or remove the seat cushions to protect them from dripping caulk.
It's definitely a two person operation
We used a fine bronze wool to clean up the chain plates and were pleased to find no cracks in the welds nor evidence of crevice corrosion.
Replacing the some bolts requires being a contortionist and the work is blind feel on some.
Paul & Wendy Keyser
"First Light"
Rye NH
2005 C36 MKII #2257
Wing, M35B