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 - 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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1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
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