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1801 Diesel Fuel in Oil

D

duckrock

Member
My tractor just had the injector pump rebuilt and the diesel return lines redone. After I got my tractor back, I didn't run the tractor above idle because of the leaking power steering pump. After installing the new PS pump I ran the idle up to bleed the PS system. I noticed a stream of fuel leaking at the back of the motor - I think from the valve cover. And oil flowing out of the oil dip stick tube. From reading older posts I see that the problem of diesel in the oil is most likely from an injector pump leaking. Because I had a small river of fuel leaking from the back of the motor I'm going to start looking for problems in the fuel return lines.

My questions are:
Is it safe to run the tractor with the valve cover off to look for a leak?
If it isn't a fuel line leak, is the injector pump leak a DIY fix? Or, does it need to go to a shop again?
Any other advise on how to find & fix the problem?
 

If fuel is leaking from the back of the engine, it's probably not coming from the injecton pump.

It'll be sloppy, but you can run it with the valve cover off for long enough to look for a leak. If you don't see a leak there, then go for the pump.
 
After the diesels are shut down and parked. Would the injector pump allow diesel to leak into oil if the throttle is opened back up while the tractor is not running?
 
(quoted from post at 09:09:58 10/25/21) After the diesels are shut down and parked. Would the injector pump allow diesel to leak into oil if the throttle is opened back up while the tractor is not running?
Click to expand...

It shouldn't. Maybe the overhauler messed up the umbrella seal installation on the pump driveshaft.
 

I just bought recently a 1821 industrial that was full of diesel in crankcase. I noticed it at time of purchase how clear looking the dipstick fluid was. For years i bet the crankcase was full of diesel soaking. I drained out approx 8 gallons of fluid from the crankcase
and just refilled with 15/40 oil. I thought about getting the injection pump rebuilt but i see no sign of diesel in the crankcase. I always turn off the fuel petcock when i stop running it.
 
The guy that rebuilt the pump said he drained the oil an put new oil in. The tractor was ran at idle a bit probably not more than an hour
before I noticed the oil issue again. So far, I did lift the valve cover up. I would classify the return line as not leaking, but it is
weeping at two injectors. I can't see the weeping as enough to fill the pan with diesel. With the valve cover lifted enough to see inside I
increased the idle and there was oil/diesel shooting up inside the valve cover like a little water fountain. Can't say exactly where it was
coming up from, but that explains why I was having diesel run out the back of the valve cover.

I plan to drain the oil pan and start with fresh oil. I'll be more aware of shutting the fuel off. And see how long it takes to fill up with
diesel while I run the tractor at idle to power my log splitter. After Deer Season!
 
(quoted from post at 20:39:04 11/17/21) The guy that rebuilt the pump said he drained the oil an put new oil in. The tractor was ran at idle a bit probably not more than an hour
before I noticed the oil issue again. So far, I did lift the valve cover up. I would classify the return line as not leaking, but it is
weeping at two injectors. I can't see the weeping as enough to fill the pan with diesel. With the valve cover lifted enough to see inside I
increased the idle and there was oil/diesel shooting up inside the valve cover like a little water fountain. Can't say exactly where it was
coming up from, but that explains why I was having diesel run out the back of the valve cover.

I plan to drain the oil pan and start with fresh oil. I'll be more aware of shutting the fuel off. And see how long it takes to fill up with
diesel while I run the tractor at idle to power my log splitter. After Deer Season!
Click to expand...


Classic return line. are you aware that you don't need to remove the fuel tank in order to remove the cover? It is hard to understand why you would run it and ruin it rather than fix it
 
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