Farmall b oil pressure

Fred Kruger

New User
I have a farmall b runs great but loses oil pressure quite a bit once warm runs perfect is there much a person can do with oil pump to increase some pressure?
 
What range is your oil pressure gauge?? If it is one of those with say 0 to 100 that could be your problem. Oil pressure on many older tractors is in the 0 to 30 range and when hot 5PSI is common and just fine.
 
If you're using 10w30 I would switch to 30wt. I've always used that in my garden tractor and in my farm tractors when I had them. Even 30wt will get thin when the temp is in the 90's and you're working it hard. Hal
 
Like tractorman said, check the bottom of the oil pump cover. Mine did the same as yours, the cover had grooves worn in it from the pump gears. Some emery cloth on a sheet of glass, sand in a figure 8 pattern till the grooves are gone.
 
been running my 1949 C hard for 40 years and it has never shown more than 4 or 5 psi on the gauge. pull the valve cover start engine and let idle while standing beside tractor. if oil is flying everywhere it is good to go. Old is right. again.
 
no problem Rich. most folks make way to big a deal about low oil pressure readings. I always hear fellers hollering about having 60 or 70PSI pressure. BS. 70 pounds would blow every seal in an old engine in short order. I am happy with my 4 or 5 pounds. my old tractor just keeps going and going. haven't even had new rings in since the late 60s.I decided long ago that 4 or5 psi was plenty.may not be enough for a green tractor but red ones just keep going. We are working the snot out of 5 c's and Superc's right now trying to keep all this baccer plowed. we have had waay to much rain here and in danger of loosing a big chunk of our crop. I guess a third of it scalded down today.tobacco is a dry season crop. I will take a dry year anytime over a wet one. I can pump water on if needed but can't take it off.
 
My B used to idle with low oil preasure and not much better runing wide open. I overhauled it 20 years ago and put a new oil pump in it at the time. The oil pressure now runs in the middle of the gauge and moves very little from idle to full throtle and have run nothing but Shell 15-40 Rotela.
 
Know what you mean. I use my BA which is half B and half A to mow hay with and the oil pressure runs when hot just above the red on the IH gauge. I also have been using a IH 340 to rake hay this year and it runs around 10psi. I also have a few old A/C tractors and those also run with low oil pressure in the 5-10 psi range all day long for decades. Now my Oliver Super 88 it runs a good bit higher
 
Your wrong, I rebuilt dozens of tractors that have 50-70 psi. It doesnt blow the seals out of anything. I use a test gauge also. I even get it calibrated every year so I know I am accurate instead of relying on an 50+ year old one. Just because you have oil flying everywhere doesnt mean you have enough hydraulic pressure between your bearings.
 

If we were talking high horsepower motors I would understand your point about the pressure needed to cushion the rod bearings. But essentially with these little motors each cylinder is putting out as much as the average single cylinder motor that is lubed with splash. And they are slow turners with relatively high tolerances. I would agree that more pressure would be better but not necessary. I know I get edgy when the needle on my A just touches the red when warm at low idle, so I do understand the concern.
 

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