Does the engine come up to operating temp relatively quick, especially if there is not much load on it? I am asking this because I am wondering if there is a thermostat in it. Without one the coolant may circulate to fast and foam up. Not sure if that has any explanation as to why it overflows coolant. Easy way to check for a thermostat is to open the cap right after you start it cold. If you see circulation right away it does not have a thermostat or the one in it is stuck open. This is one time I would also recommend going the easy fix first, by trying a new cap. After checking out these items if it does not use more than a quart or two in 3 - 4 days use I would run it. The other posters pointing towards compression coming into the system have valid points. There is the possibility of a failure that would fill the cylinder with coolant and hydro-lock a cylinder. Probably a good idea to crank this engine a couple turns with the throttle in the stop position first. Then give it fuel on the second spin once you know no water is leaking any cylinders. On a side note, I had no idea what a 946 was as stated by the poster from across the pond. I figured that he was likely talking about some other foreign brand. Turns out it could possibly be an overseas IH model, see link.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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