E32-200 Yanmar 3GM30F Heat Exchanger Service, Don't Mix Coolant Colors

While I had my engine out of my sailboat this spring, I earnestly(!) thought of good proactive, preventative maintenance I could carry out while being able to walk around the engine and access the top and all four sides with ease.

I’d seen horror examples of clogged heat exchangers on the internet and the disassembly process was not excessively daunting, so I thought I would give it a try. On a Yanmar 3GM30F there are two end caps on the heat exchanger, and a central cylinder element that...
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This is better-presented explanation of the problem than most of the "expert" articles I have read over the years.

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