Originally Posted by FrankLanger
With your experience installing zincs on boats, can you tell me if there is a general lifespan for zincs on prop shafts and pencil zincs in diesel motors? I moor the boat in the Pacific Ocean on Vancouver Island, BC, Canada. I just bought this boat in Spring, replaced the zincs then, and am wondering when I will likely have to do it again--annually? semi-annually? I know that this may vary depending on conditions, but is there a general rule of thumb?
There are many variables that affect anode life and performance, so it's hard to generalize. However, I tell my clients that everything being as it should, you should get 6-9 months from a compliment of zincs. Dramatically more or less than that, and it's time to start looking for a reason.
I would never recommend going more than 6 months without at least putting a set of eyeballs on the zincs to see how they're doing.