Just got a 1952 Farmall Cub that runs good. The oil pressure gauge reads around 22psi most of the time. I have some blowby out of my dipstick hole and I just cleaned a blockage in my oil bath air filter line. What is considered good oil pressure for this cub. I am running 10w 30 oil.
- Thread starter Satohbill
- Start date
Crazy Horse
Well-known Member
Not sure exactly what it should be but I will tell you that you have a lot of life left in that engine. I have a Farmall A that shows about two pounds of oil pressure once it warms up. Starts good and never lets me down and seems happy to go through life with less pressure, just like people !!!
Steve@Advance
Well-known Member
A good general rule for oil pressure is 10 PSI per 1000 RPM when up to operating temperature. So if you have 22 PSI at running speed, warmed up, and have 5 PSI at idle, you are good.
Originally that engine was probably supposed to run 30 weight in the summer, 20 in winter (just a guess). That was before multi grade oil was invented. Most now run 15w40 diesel oil in the old engines. Maybe drop down to 10w40 if you use it in really cold weather.
Originally that engine was probably supposed to run 30 weight in the summer, 20 in winter (just a guess). That was before multi grade oil was invented. Most now run 15w40 diesel oil in the old engines. Maybe drop down to 10w40 if you use it in really cold weather.
Andy Martin
Well-known Member
That's a lot of oil pressure for a Cub. No reason to go to higher viscosity when it's carrying that much pressure.
What confuses me is my friend has a 48 cub and I also have a 65 cub. The oil pressure on both of them read much higher. Just curious how you read the oil gauges that has hash lines instead of #s. They show a 0 then 4 hash lines and then a 40 hash line, Each hash line can not be 10 psi cause it don't add up.
BarnyardEngineering
Well-known Member
- Location
- Rochester, NY
The engine in this Cub is likely more "tired" than the others you have experience with, but as long as it holds that much oil pressure you are fine.
From personal experience, higher viscosity oil makes absolutely no difference in oil pressure. I went from 10W30 to 20W50, so... double the oil pressure, right? Didn't even get 1PSI improvement.
From personal experience, higher viscosity oil makes absolutely no difference in oil pressure. I went from 10W30 to 20W50, so... double the oil pressure, right? Didn't even get 1PSI improvement.
john *.?-!.* cub owner
Well-known Member
Before you get to worried try another oil pressure gauge.
Andy Martin
Well-known Member
You might want to read up on viscosity.
You went from 30 weight hot to 50 weight hot which is an improvement but not twice the viscosity. And, as you have experienced, doubling the viscosity does not double the pressure drop from the pump to the crankcase. As long as there is an open flow path for a gear pump increasing the viscosity does increase pressure drop from pump to bearing exit but only so much as the viscosity affects the pressure drop, which is not one to one and is not linear.
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