My thought is that you're overthinking at this stage. In the 1939-1947 run of the the A/B/BN the motor was a thermosiphon cooling system, with never a thought given to a a temp gauge. Not entirely accurate - there was a gauge and installation available if you really felt you needed one, but such indulgence was not oten exercised. Thermosiphon, ingeniously if not devilishly simple, a fan and radiator size coupled with the older-than-the-Greeks concept of convection for cooling. So efficient that the temp gauge was an option.
Quite simply, if they were clean inside, they didn't overheat, no matter how hard you worked them.
Cool air flowing OUT of the breather??? Balderdash. You may feel a draft there (doubtful -- don't confuse the draft coming back from the engine fan . . . ), but if the motor is actually running, any cool draft at that point is air flowing in, not out.
Trust me, if you are holding your hands over the breather cap, any flow of air that you feel is NOT blowing out of the motor.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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