White smoke is water, blue smoke is oil. Is your oil milky or cloudy at all? 140 isn't enough to clear condensation from your crankcase, get it hotter somehow. When I work my 44 A the temp gauge goes to 220, if yours is a thermo-siphon system like mine you should also have less than perfect heat extraction due to the anti-freeze mix not being as good as pure water at that job and have the same resulting temperature. Unless you are not putting it under a load and really using it. Pull your gauge and sender and boil the sender on the kitchen stove and see what it says is the boiling point of water. If it really is off by 70 degrees then you've just verified that fact. And it then becomes useful to you as is.
Easy solution is to just change your oil more often on a cold blooded one or parade putter if the water is coming from the engine oil. If you have thermostats you should pull them and test them in boiling water too. Obviously, if they don't shut fully there is your problem with the low heat issue. As B&D suggested get 195 degree ones and do your engine a real big favor.
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