Join Date: Aug 2011
Location: In a strange land
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Re: Leaking Chain Plates
If they have been leaking over time there may be invisible water damage in the deck core or chainplate itself. When I worked for JJTaylor the chainplates sat on a slightly raised area of the deck, obviously intended to avoid water run in.
You should support your rig, loosen the turnbuckles and remove the chainplates. Clean out entire insert area, rebed with butyl.
Some chainplates are mere stainless steel bar running through the deck, some have a welded in chainplate hood, some have a separate hood (aluminum, stainless) that drops down over the chainplate after it is bolted in place. Intention is to increase the sealing surface. If you don't have chainplate hoods they are easy to fabricate and bolt or screw down to compress more butyl. Check other boats in your area to get an idea of the methods used.
Do you know where the boat was built (Canada, UK) and what year?