Originally Posted by
gcnettl
I agree that anything above 180 is hot for a marine engine, and is not designed for operation above 180.
An automobile can run 220 under pressure and still be fine. Since a boat does not have a pressurized system, at least not a freshwater boat, then reaching 220 would not even be as bad as reaching 220 in an automobile.
Something is not working right if the boat operates over 180. However, I wouldnt judge the motor is bad because it was operating over that.
BTW, 165 to 180 is normal operating temperature, as stated in the owners manual.