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Oil Pressure Reading

S

Sapper55

Member
Gentlemen,
I Rebuilt my MH 44 engine last year. I did not replace the oil pump, because it was reading 30+ before rebuild. Ever since, my oil pressure gauge has been reading low at about 20 psi at max throttle. The gauge is the original that was on it when I got the tractor. The tractor runs pretty good irregardless. I guess I need to replace the oil pump. Any Ideas? Thank you for any responses.
Sapper
 
(quoted from post at 04:19:52 08/14/15) Gentlemen,
I Rebuilt my MH 44 engine last year. I did not replace the oil pump, because it was reading 30+ before rebuild. Ever since, my oil pressure gauge has been reading low at about 20 psi at max throttle. The gauge is the original that was on it when I got the tractor. The tractor runs pretty good irregardless. I guess I need to replace the oil pump. Any Ideas? Thank you for any responses.
Sapper
Click to expand...

Do what you want to but if it were me I'd plumb a temporary oil gauge and see if I reads different first!
Maybe your getting a false reading out of your original gauge???
Not saying your old original oil pump might be tired and worn out but it's a whole lot easier and cheaper to try a different gauge first!!!
Good luck
 
First: determine what the proper oil pressure should be at normal operating temp on this model tractor, you must know this #.


I had an old AC tractor and it operated at 10-20 pounds. I installed a new 60 psi gauge on the tractor and the oil pressure hand hardly moved off 0.

******definitely try what MF said to do, determine proper oil pressure numbers, then try another quality oil pressure gauge, before you start tearing down the motor.

did you change the oil and add back a thinner weight oil?
my old gas Ferguson likes shell Rotella 15w40 diesel oil, this oil still has the zinc additive and the tractor holds much better oil pressure with this oil.
 
I rebuilt my MF35 Z134 gas about 10 years ago. Put in new oil pump and was satisfied with my bearing clearances. Tractor ran at 20 psi then and runs at 20 psi now.Just my opinion but I would not worry about it.
 
The Rotella did have the zinc additive at one time but not anymore .... actually not for a while. You can still buy additive but it's not cheap.
 
Yea, I looked this up after your post, it appears they have pulled most of the zinc out of shell rotella oil. New vehicles with there fancy epa gear, I guess.

If so why am I still using it in the old tractor.

In addition, I found a bottle of zinc additive in my shop, I must have bought it for something, maybe I forgot about the zinc being pulled from rotella, who knows.

My old tractor still holds a much better oil pressure using shell rotella oil 15w40, guess I will still use it in my tractor and dodge diesel truck.
Do you know of any diesel oils that still have the zinc additive?
 
Last year I came across a guy who was selling off some "obsolete" oil that he had. It was Phillips 66/Conoco/76 (all three brands on the label) T5X Heavy Duty SAE 40 ....... service classification CF-2/CF. It has the zinc additive in it. This oil is supposedly formulated for off road use and even more specifically for diesel 2-stroke engines. I did some research on the internet and it is also recommended for older 4-stroke engines, and when you think of it .... older tractor engines survived on oils that were a lot less developed than this stuff. Works fine for me with a few 1940's gasoline engines. On the other hand, how do any of us know just how good any oil is working? Oil pressure is just one facet of that I think. I won't use it in my Honda Civic though ..... ha !!!
 
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