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I just went through an overheating problem with my MF255. I like you suspected all those bad things. I decided to start by pulling the radiator off and having it cleaned out. When I got it off, I found out that the previous owner had been blowing trash out with either a pressure washer or high pressure air and all the fins on the radiator were all laying down on the inside of the radiator. I too had a film on the coolant.I also had no coolant in the oil. I ended up re-coring the radiator (around $150)and putting in a new thermostat for good measure while I was at it. You have to pull the hood and all the way down to the tank mounting plate has to come off to get to the thermostat. Result is now that, the thermostat opens at 175, runs most time less than 190 degrees and working the 6 foot bush hog in waist high thick hay got it up to 195 after a couple of hours. With the compression on the diesels, it isn't all that hard to get a film on the coolant over time. You can have gas seepage through or around the head gasket to do that without blowing the gasket. I have experienced the same thing on my 8N also. I too had no white smoke like you. I hope you are as lucky as I was.
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