so my machine has just shy of 4000hrs on it it has had lots of hard use but well maintained here lately I have noticed that the oil pressure light comes on so I installed a manual gauge in the cab when the light comes on the engine is warm and about 16psi ---- cold about 60psi the 16-20 psi ------ I have been running synthetic oil in for the last 3 or 4 years I bought a jug of rotella 15-40 non synthetic to try to see how it works ----- my question is what does this engine run normally and where should I shut it off and rebuild it I have a friend that is a retired engine builder and he claims a engine under normal load can live at 10psi for a long time just don't let it get lower than that under load
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walio123
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If those 16 psi are for idle you are still ok. Allowable limit for idle it 14 psi. Oil pressure rated rpm - 42.7 - 64 psi. Allowable limit - 36 psi. It says service manual for kubota V2003T - EB (TURBO)
I'm guessing your getting shutdown by protective shutdown. Going to need a dealer to throw the laptop on it. Need to see what the controller see.. Maybe the sensor is a little off that a new one will solve your problem. Otherwise you may have a another sensor going to pot throwing off the whole sensor circuit and the controller is guessing oil pressure.
Usually engine specs give a oil pressure standard at a certain rpm. In the case of my 743 with a Kubota diesel the oil pressure should be between 35-45 psi at 2000 rpm. I don't know many engines that take the oil pressure at idle. You are probably OK. Electric switches go out all the time.
I stand corrected. The above specs were for a gas engine. My Kubota specs are as follows. Oil Pressure @ rated RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–56 PSI (290–386 kPa) Limit Permitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 PSI (248 kPa) I looked up the rated rpm and all I could find was the rpm limit which is 2800 rpm. That would sound about right. FWIW
well with that info I checked and at wide open it is 28psi so it is a little low i am going to try some thicker oil
walio123
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Use a good, quality gauge to measure pressure.Because if it is permissible under you can have a pretty big money trouble. It is better now to disassemble the engine and check the crankshaft and bearings and oil pump. The consequences can be very expensive - a new crankshaft and camshaft, new pump, new rods .... even seen cracked engines.
It's possible its just an oil pump problem. I have seen a few where the relief in the pump was the cause.
well we got about 10" of snow today so i got it warmed up with dino 1540 the lowest I got for oil pressure was 21psi at full throttle I am going to pull it here soon and do a bottom end new oil pump rods and mains
Can you try a slightly heavier oil? see if the pressure comes up a little?
It will add up fast if you want to re-do your current engine.
Mikefromcny
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Typically good cold oil pressure that diminishes to low pressure when warm is worn crankshaft and main bearings.
so I have been gathering parts for this I had bought a head gasket a here a while back just to have in case I needed it I made the lift to remove engine and bought a oil pump and pan gasket now the strange thing I have been loading hay big round bales to sell about 18 per load well on Wednesday I loaded what I was considering to be my last load before I tore it down after loading the bales i would usually get the warning light just before I was done and it would be at 21psi when I was done I looked at the gauge and it was at 50 psi full throttle and idle about 32psi so i used it for a hour or so doing other stuff and it was the same I started it today and no issues I am going to pull it in the next couple of weeks any one have any idas of what it could be screen plugged ??? pressure relief stuck partly open I am baffled to say the least I have a manual oil pressure gauge installed as to monitor what is happening
