Deposit/scaling in raw water cooling
So is this normal? New to me BMW D190 (mid 80's) diesel engine. Have not run the engine yet. I removed the thermostat cover to discover no thermostats. The white scaling concerns me. At first I thought it was a coating of some kind but although hard it crumbles away. Is this salt deposit? I believe I am looking at the sea water side of the cooling system. The fresh water side appears clean. I have not pulled the heat exchanger or the sea water pump yet but will now. If this is salt I am going to guess the engine/boat spent some time sitting in salt water without being flushed. My 28' trawler is on a trailer so going forward the motor will be flushed after each use. Any comments/advice appreciated.