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 - The 9N Lives Again - by Tyler Neff. I often reminisce about the good old days of my youth when I visited my grandparents on their farm in Moorefield, West Virginia. I lived in Middletown, Maryland, which was about two and a half hrs away from the farm. During my summer vacations I would spend two weeks helping granddad Wilmer with his farming duties. Wilmer and his brother Weldon owned the �Neff� farm. Th
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