IIRC, they run a little higher than the older tractors with similar engines, maybe 45 to 60 at high idle.
NOT sure what to expect at slow idle.
It was common for the older C-113 and C-123 engines to warp the oil pump cover, causing a drop in oil pressure, especially at idle, and AFAIK your 140 has the same setup, so that's the first place I'd look if oil pressure is disappointing.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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