Tell you a secret, if you actually have no more than .004 clearance, you won't gain much on oil pressure with new bearings except at low idle when using light engine oil. Forget the plastiguage , use a piece of shim stock,.004 about 1/2 inch wide, 1 inch long, lay it in cap and tighten it down. Slight drag will indicate .004 clearance, no drag, more than .004. Then you can try a little thicker to see what you actually have. Best way to measure clearance is with a inside mic in bearing journal and then measuring shaft. Of course this isn't always practical. Now as for oil pressure, make sure the pump is in good condition. Lot of them wear the shaft and have excessive clearance around the outer edge of gear. I have replaced a lot shafts over the years and the housing normally is ok. Also, many H tractors have the WRONG relief valve. It should be a straight cyl end to end. If it has a small diameter on closed end it is wrong.These wrong plungers will give you about 45 psi . And then the springs get weak over time. An H should hold over 60 psi, no problem at higher rpm. If all these things check out you will have to tear engine down and establish correct clearances through out including cam shaft.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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