There may be some kind of aftermarket conversion available. But if I am inferring properly from the IT manual, there never was a Farmall A with a water pump, not even Super A. They were all cooled by thermosyphon effect. So no, you can't take one off a later model and stick it on; there were none! This can be done with some early production Cs, apparently because Farmall had already decided to put a water pump on the Model C when it was introduced, but didn't get things ironed out in time for the beginning of the production run. So, Farmall made available a "Water Pump Attachment," and many of these tractors were retrofitted for water pumps, especially in the South and Southwest. Some late-model Super As had a pressure-type radiator, which is a must with a water pump, and many of these radiators found their way onto earlier production As as replacements. Look for a vent pipe under the radiator cap lip.
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