450 diesel fuel in oil

jhncp · Mar 21, 2023

I have a Farmall 450 diesel I haven't started in over a year and the engine oil is a couple inches over full and thin and smells like diesel fuel. I assume the injector pump must be leaking into crankcase and how hard is it to replace seal?

Mrfred54 · Mar 21, 2023

If me, I would change oil and filter and run it and keep an eye on the oil level. Stranger things have happened maybe the seal will get warmed up and begin sealing again. Worth a try!

Janicholson · Mar 21, 2023

I would assess then repair as needed. If the pump is leaking over time, I would do the change and watch procedure. I would also shut off the fuel between operating sessions to be assured as to whether it is small and when shut off, or when running. Jim

redforlife · Mar 21, 2023

X2 on changing oil and then keeping an eye on the situation. Some run time might help things out, or make no difference at all.

A couple inches to the pan over a years time, it'll take awhile to build back up in accumulation again. Might not notice much difference in a months time, but I'd check the oil level more often than that while keeping an eye.

Whatever you do, catch the old oil when you drain it. And for sure let it drip before completely taking the plug out. If those drips are antifreeze/water, then your build up could be coolant in the oil (it'll be at the bottom of the pan if any and the first to come out). Just because the oil smells like diesel, it could smell that way with only traces of diesel in the oil and the build up of actually something else in there (coolant/hydraulic oil).

Sometimes its best to investigate, and not assume.

the tractor vet · Mar 21, 2023

On a injection pump on a 450 if your getting diesel fuel into the crank case then you have more the one seal bad. And This is a bad thing. The seal on the lift pump is bad and filling the crank case of the injection pump with diesel fuel . BAD as the injection pump need regular engine oil in it and damage to the bushing inside the pump that the cam shaft runs in will ware and cause problems , then the seal on the drive end is also back letting that leak on into the engine. And now this is working on the main's , rods , cam bearing. And these pieces and parts are REAl hard to come by today. SOOOOOOO myself i would be PULLING the Pump and send it out and have it gone over resealed and everything checked. At one time i owned a 450 D and loved it . Should have never sold it. Each day one should check the oil level in that injection pump and change it with each engine oil change. . If it is low then ya add Engine oil to it till it runs out the check plug.

jhncp · Mar 21, 2023

I put new main bearings and rod bearings in a couple years ago.

jhncp · Mar 21, 2023

There was no antifreeze at the plug, I'm pretty sure it diesel and not hyd oil by how thin it feels and the smell. My concern is if I try changing the oil it might always leak a little even if I shut fuel off and use it regularly because engine oil is expensive to change.

rustred · Mar 21, 2023

and to add,... when u know its leaking open the petcock and drain it down each time , even if your just walking past the tractor, once the oil is thin i just drain it and refill the pump. keeping an eye on that saves your engine oil. i have a few of them and never had one leak into the oil pan.
and i suppose u could have a pan or can under the pump and leave the petcock open,... then u can see how bad the leak is. iol costs too much to waste it.

caterpillar guy · Mar 21, 2023

I've never had a leak heal up so it quit leaking. I doubt you will either. It sounds like time to do as TV says and have the pump worked on. Hang on to your piggy bank when they tell you what it will cot too. Probably close to what the tractor is worth. Parts are getting harder to find for those pumps too. Our MD has leaked into the pump reservoir for years just drain it off and fill with oil. didn't leak into the crank case. Either that or we used it enough it evaporated it out.

the tractor vet · Mar 21, 2023

And your point is , if your running on diluted oil it sure is not helping them live a long and happy life.

n9lhm · Mar 22, 2023

How is the oil level in the pump? A 450 probably has a B series pump, which does NOT have the internal scavenging to return leakage fuel to the tank. It has a drip tube out the bottom where the leakage fuel from the distributor valves goes. These typically get plugged with dirt and then the leakage fuel has to go somewhere else. First thing to do is take a piece of wire and clean that tube out. That may not be your whole problem, but I bet it is contributing to it.

450 diesel fuel in oil

jhncp

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Mrfred54

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Janicholson

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redforlife

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the tractor vet

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jhncp

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jhncp

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rustred

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caterpillar guy

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the tractor vet

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n9lhm

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