sailingdeacon
Member III
My Universal m35 has a pencil zinc in the heat exchanger. When I change it there has always been a drip, so I had to put some caulk on the threads. Recently I had some galvanic action occur on a new water pump (part of the raw water system with the heat exchanger). The zinc showed some wear but perhaps not as much as usual. Is there a danger that the caulk would prevent a good electrical connection? Or why am I getting a leak in the first place?