My newly acquired boat had an engine with rusty looking coolant and pasty globs floating in it. I had to flush 10 times to clean it up. In this video I go through the steps in coolant replacement.
That's a great question, I should have mentioned that. The Yanmar service manual for the 2GM20F shows the temperature switch normally off at 187F and comes on above 193-202F and the thermostat fully open at 185F. So based on that I was looking at 180 as a max temp since I was looking at the surface of the engine.
@@trailsandsails2722 "The Yanmar service manual for the 2GM20F shows..." Or as I was told in high school: "If all else fails, read the instructions." Thanks for humoring a lazy sailor 😊 And thanks for the succinct video!
Thanks for your comment and my apologies for not making this more clear. I was using distilled water to flush out old antifreeze/coolant. It took several flushes with running the engine each time for several minutes to clear most of the old coolant. Perhaps there is a more aggressive flush than distilled water but I could not find anyone to recommend one. After the last flush, I filled the engine with a diesel engine coolant.
