"From the looks of my R1 castings, it doesn't look like there is a simple way to achieve a good running temp in winter with a water pump without a thermostat, or shutters. Just how did IH do it?"
If IH put on a water pump, it had a thermostat to build the heat. There were differences in the cooling ports between the head and block (and, therefore, the head gasket) for motors with pumps and thermostats from those with thermosiphons.
Start first with the fct that the radiators on them were oversize and the fans are wicked efficient. Enough so that the shutters were common on the thermosiphons running on distillate. They ran even cooler than diesels do now, and you'd have done well in cold weather to ever get them up to operating temp.
In especially cold areas, folks would put the shutters on even gas engines as an option. I have a SuperC with them, and I use them about anytime I start it up in winter, and even on short runs in the summers, just to get it warmed up well before I shut it down.
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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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