Sacrificial zincs are an important part of your boat in any place that sea (raw) water comes into contact with metal. This metal will corrode and breakdown before any of your other metal fittings. This keeps your other fittings in good shape. For instance, there's one on the prop shaft to keep the shaft and the prop from corroding in the sea water. I won't bore you with the chemistry involved-
I will say that none of the boat yards we've ever had the boat pulled at have replaced the zinc from the heat exchanger. That's the one in the picture. Make sure you confirm which will or will not be changed by the yard, and do the rest yourself!
Upcoming projects include wiring and exhaust riser replacement. Stay tuned...
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