Join Date: May 2006
Thanked 0 Times in 0 Posts
Rep Power: 0
I have a Yanmar 2GM20F Diesel, and have not changed coolant during the two years that I've owned the boat.
I'm finally about to make amends, but I'm having trouble figuring out the proper procedure: The engine manual doesn't cover it, and the SELOC manual recommends a very complicated procedure involving several flushes with a coolant circuit cleaner (which I'm having trouble finding) before refilling.
Also, both recommend filling with a 50-50 mixture of water and antifreeze, and I've seen several posts claiming this is an old recommendation that should not be followed when using modern antifreezes.
I'd appreciate some educated opinions on both subjects...