I have a motorcatamaran with two Yanmar 150 with Mercruiser Bravo II and want to exchange knowledge and experiance with others who have the same inboard Diesel.
Specifically I started to exchange engine coolant/closed coolant system but found out that the BY Series Operation Manual says to access the cylinder block drain plug the heat exchanger shall be removed. Removing this the heat exchanger is a bit tedious so I started to think about other methods to drain the coolant. For example flush the system with fresh water and then tap off some of the fresh water volume and add concentrated coolant. is there anyone who have used such a method ?