Hi. Is there anyone out there who has a diagram, instructions, or other information about a Sen-Dure heat exchanger, model 2827? I have one mounted on my Yanmar 2QM15 engine. I'm eager to change the antifreeze in the unit, but where it is mounted, I have very little access to it. It's difficult even to see where the heat exchanger begins and ends. I would rather not detach it if I can avoid that. I'm sure there must be a drain somewhere that I can't see. I'd appreciate any guidance. Thanks Derek Kennedy SV Tortuga, 1979 C&C 30 mk1 Ballantyne's Cove, NS
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