Investigating low oil pressure

motorv8N

Member
I can ignore it no longer. While my trusty 52 TEA20 would push and pull snow around in the depths of a frigid winter for hours at 20psi, in the warm weather she has been slowly sinking. In the past, upon starting the gauge would be pinned at a max reading of 60 psi for about five minutes, then would start to fall, usually landing between 15 and 20. Now in the heat (like this last weekend while grading a steep gravel drive in the blazing sun) she's leveling off at a new low of 8 psi while working.

Thinking perhaps the incline had something to do with it this last outing I ran her a few kilometers to the dump and back on flat dirt roads but she never rose above 10 psi in any gear at any throttle setting. Oil for both winter and summer is 30 weight.

First question is: what's the acceptable pressure range for this tractor before one should get concerned?

Second (and third) question is: If 8 psi is indeed too low, where would one start looking for the culprit? Is the oil pump a serviceable unit or do you have to chuck it?
 
Personally, I think I would fill her with 30w50 or 40 wt and see if that helps until I got better information. Oil pressure at a given speed is affected by three things: oil viscosity, bearing clearances, and pump condition. Temperature affects viscosity more than the other issues. Your problem (assuming your gauge is accurate) could be any or all. My parts book doesn't show any pressure regulator so that leaves just the three items above.
 
7 pounds is the minimum pressure. Your oil pump is likely shot. it can be repaired. The screen may be plugged. it is easy to remove the oil pan.
use 10w30 or 10w 40. do NOT use non detergent.
 
Hate to barge in here out of my color range, however, just a point or two because engines are engines.

Viscosity differences only show up in the first few minutes of running. I.E. You see the pressure fall as the engine warms up? Oil is thinning to the consistancy of water as they all do. Normal occurance.

Two: Oil pumps don't just magically "fix" themselves when cold.

You need an engine overhaul.

Allan
 
You have Standard engine in your TEA. What does the manual say about your oil pressure specs?

Your oil pump may be worn, and/or the relief valve may be stuck open, and/or the mains are worn. You can try higher viscosity oils but that will allow you to buy some time. You need to find the root cause and then fix it.

If it were my machine and I didn"t need the tractor right away, I"d get access to the relief valve and check it and the spring. If that doesn"t fix it, then rebuild or replace the oil pump and see if that does it. If that doesn"t do it, replace the mains. All the previous stuff should be done with a lower end rebuild anyway.
 
Thanks guys -- very helpful info and gives me a place to start..at the bottom. I've got to hunt down a proper manual. I bought an online CD but it turned out to be a very poor scan job. Some pages are almost illegible. Ya get what ya pay for indeed!

Allan -- no need to apologize for the barge-in -- as you say engines are engines and I'm happy to entertain all feedback. I didn't mean to leave the impression that I was mystified by the oil pressure drop as the engine warmed or that I thought the pump was working better in the cold. I will admit to having a hard time accepting the oil in that pan gets as thin at minus 10 as it does at plus 30 but I'm new at this and have been wrong before. :D
 
Heck Allan, you"re not "barging in". You"re helping this guy with his questions. Doesn"t matter what color rigs you have, helping another tractor owner with a problem is the name of the game here. You"re welcome anytime.
 
I had the same problems. Bearings are shot..all in the pan,,oil pump is bad as well. Lot of ole timers around me said if it had pressure you are ok...BULL...now waiting for funds to rebuild..made me sick to have to park it.
Eric
 
motorv8N
Replacing the oil pump will probably give you some more oil pressure but the right fix is to also redo the bottom bearings.
I would drop the oil pan and pull one main and one rod bearing cap to see what wear is there and repair accordingly.
Brian
 

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