6 years ago I installed the Moyer heat exchanger. My previous heat exchanger was much bigger, about 18" long and 5" across. A friend told me it was big enough for a 90-foot boat. Since then I have been using the same saltwater pump, a Jabsco 777-9001, about 3"diameter impeller, running off a belt to a pulley on the flywheel at the same speed as the engine, giving I estimate something like 15 to 25 GPM. I know this pump is much bigger than the pedestal pump Moyer sells to run salt water through the heat exchanger. Moyer's pump pushes as much water as the fresh water pump does. Last year my Moyer HX developed a leak where salt water exit tube is attached to the body of the HX. I did a repair with epoxy and silica, but it didn't hold up so I got a local guy to silver braze it. He said there wasn't much left to work with. I brought it home and wire brushed it, but he didn't build up material at the joint underneath the exit tube, so I opened another hole there maybe a millimeter across. I fixed that with epoxy. I may have to buy another Moyer HX. I wonder if the force of the bigger pump is eroding the HX too much. Or maybe I just let the pencil zinc in it get too eroded.
Any thoughts?
Any thoughts?
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