Many of our boats from the early 80's have aftermarket heat exchangers from a company called Sen-Dure. While most have the removable end caps (with O-rings) that have been mentioned previously, the heat exchangers are VERY expensive to replace ( I was quote approximately $600-700 USD). While mine has been acid cleaned several times to remove scaling, it has developed a pinhole leak where the outlet tube attaches to the heat exchanger cylinder. I was told by a radiator shop that braising the hole shut would be problematic so my only alternative to buying a new one was to "patch" the leak with JB Weld epoxy. So far that has been satisfactory but if I was to take the boat for an extended journey, I'm not sure if I would trust the patch job.
For reference, my diesel is a factory installed Yanmar 3HM-30 with a C&C factory installed fresh water cooled conversion kit. Chuck Gilchrest S/V Half Magic 1983 35 Landfall Padanaram, MA
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