Raw water cooling - removing scale
I have a raw water cooled diesel engine in my boat. By changing zinc, I noticed a lot of scale inside. Is it any way to remove it without disassemble the engine?
I had a liquid in mind, which would be put into engine instead of raw water for a few hours to dissolve it. I got many suggestions from vinegard on, but I had a fear to damaga gaskets, impeller pump etc. Have anyone any suggestion how to do it?