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Aftercooler & Heat Exchanger Zinc Replacement Periods


Hello, I'm a new owner of a Carver 405 with Cummins 6BTA5.9 330hp engines. I'm just servicing my aftercoolers and found the zincs were either gone or well overdue for replacement. Fortunately, there were no issues with the housing and cores. I'm in salt water year round. I'm wondering what your experiences are with an interval on changing these out before it's too late and they are gone or are at the point they can't be extracted.
Thanks in advance.
Frank

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