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10-20 oil pressure

Alot of older tractors only ran around 15 lbs of pressure new. I think a 0-30 gauge will work fine.
 
The pressure may be in the 5 pound range. If I recall the rods and mains are not pressurized. the oil "pressure" is going mainly to the top end. A 10 PSI gauge might be OK, Check with OEM for a correct gauge. JimN
 
Oil pump on the old ball bearing engines just circulated oil through the filter and then squirted some into governor housing and then had nozzles that filled splash trays for the rods to scoop up oil to lube rod bearings. Engine was splash lubed, you had to manually oil valves up top by putting oil into the trays and felt wicks kept the valves oiled. Pressure was likely 10 to 15 lbs as they said.Sounds crude, but look how many are still running 75 yrs later.
 
10-20s ran about 6 lbs pressure. If you use a gauge that reads to 80 psi the needle may not move much. The original gauges I think were calibrated for 10 PSI.
 
If my memory is right after 60 years, I think there were no numbers on the oil gauge of the 10-20, F-20 and other tractors with that type of engine. If the gauge moved over pretty much to the right, you were OK, as I remember. The rods are lubricated by splash, and there is no oil pumped to the valves (except what the driver put in with an oil can a couple of times a day!). As long as oil was reaching the rods, bearings and governor, you were probably ok even if the pressure wasn't very high.
 
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