We should have done this sooner because it’s important, but we’ve been busy with other tasks.
Since it is constantly circulating warm salt water, the heat exchanger is prone to corrosion. It is also really expensive ($500 for a new one). In the side of the thing is a plug, and a pencil-looking piece of zinc is threaded into this plug. I replaced both the zinc and the plug (the old plug’s threads were all gummed up).
The oil cooler has what looks like a plug for a zinc on the bottom of it. However, when I pulled it off I discovered that it is just designed to be a plug–there are no threads on the inside to which you can attach a zinc. However, my bright idea was to buy a replacement plug, threaded, so that I could add a zinc to the oil cooler as well. So this I did.
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