I would not recommend oxalic acid as a flushing agent as it is particularly corrosive to metals. Yanmars have some exotic alloys in their heat exchangers which is a great benefit to their performance and longevity, but I am not sure how they would respond to acids. I believe the service manual for my 3JH4E specifically prohibits using strong acid or alkaline cleaners. Having said that, I used to get the troublesome heat exchanger on my old Westerbeast blown out at a radiator shop periodically and I think they used muriatic acid to flush it, but that unit was copper and they were not running acid through the whole block with all those gaskets, bearings, and differing metals when they were flushing and testing it. Also my physician friend says to wear gloves around oxalic acid as it is absorbed quickly and goes right to your liver. Oxalic acid is great for removing rust stains from fiberglass. FWIW.
Ray Durkee Velera T37 #373
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