Actual psi is not all that critical. They should run 60 to 70 warmed up under load, BUT, what you watch a gauge for is a change. If an engine has been running that way for many hours it is more than likely general wear in several components. If, all of a sudden you get a change in oil pressure that is when you sit up and take notice. I have repaired many, many oil pumps on M's over the years and the normal problem with those pumps is wear on the shaft just above the gear where it is supported in the housing. That is the pressure point. Luckily though, the housing rarely wore much at all and a new shaft fixed the problem. Normal overhaul procedure was to replace spring and plunger and adjust end play. Had to be careful to get correct plunger though as parts books were messed up years ago and some plungers had a smaller outside dia on the pressure end and that is the wrong one for an M or H. End plates didn't wear much, that is the smaller engines that gave all the problems with that blowing gaskets, warped or worn end plates.
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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