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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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