Imzadi has 2 Camp zincs on the prop shaft (whacked good, but no TefGel) and spends most of her time in the slip not connected to shore power. I end up replacing zincs about every two years; sometimes one of the two is more eroded than the other, and the better one will last for another year. I would not presume that your performance after 18 months is all that unusual, especially if there is little stray current on the docks and you have an isolator.
I replace the pencil zinc in the heat exchanger when I change the oil and filter, which works out to be about every year with typical boat usage of about 100 hours per year. Smaller zinc, and I’m mostly in brackish water. Rick Brass Washington, NC From: CnC-List [mailto:[email protected]] On Behalf Of Dennis C. via CnC-List Sent: Thursday, November 2, 2017 11:01 AM To: CnClist <[email protected]> Cc: Dennis C. <[email protected]> Subject: Stus-List How long do zincs last? Recent thread gave replies of 3-8 months. I dove Touche' yesterday to change the zincs and found the prop zincs were only about 20% sacrificed. Best I recall, those zincs have been on the shaft for about 18 months. On the other hand, I seem to go through engine heat exchanger zincs about every 6 months. Go figure.
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