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MF 150 oil pressure

O

oregonfarmer

Member
My Perkins diesel has an oil pressure problem. I installed a new SW gauge directly to the block (no line) when the problem started. but it read same as old MF unit.

Here is how the gauge reads-cold startup 40 and in a few seconds it slowly falls to 0. In a few seconds it goes back to normal. The pressure may stay normal for a time and then repeats the up and down cycle. Engine RPM seems to make little difference.

I have flush the engine twice and new oil stays very clean now, but the oil pressure fluctuations persist. I started using 20-50 oil(used 30 before). The engine runs well and uses little oil. I keep using the tractor. Am I going to ruin it?
 
If you have double checked the gauge, then more than likely it is reading the current oil pressure,

I think you should not use it until you find the problem

Fastest way to ruin a good motor is let it get hot, second fastest way to ruin a good motor is to let it run with no oil pressure,

I would call in a mechanic and find the problem,

A rebuild is costly,
 
Usually when the oil pressure fluctuates it's usually a bearing problem, don't run it! If it were me I'd drop the oil pan, and look at the main, and rod bearings.
 
I had that problem with an A3 in a 35 (purchased quite cheap at an auction because of the problem), and it turned out to be a loose nut on the oil pickup.
 
I'd suspect an oil flow problem on the pump inlet side. Had a tractor once that did the same thing, great oil pressure, then drop a bit, and climb back up again. Dropped the pan, found the oil pickup can down against the pan just enough that oil could barely get past the can/pan area. Cut four Vee notches in the can, that fixed it. Could also be the already mentioned oil inlet pickup line loose, letting air in too. Loose main/rod bearings will show up with hot engine oil, and check fine cold.
 
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