Gaining oil

[Irv1Dehut]

B20 Kubota TLB. It was gaining probably an inch on the dipstick in an hour. I replaced the fuel pump with an oem from Coleman's Kubota. Still gaining the same. Next I removed the injection pump and took it apart and didn't see anything wrong with it, just cleaned and reassembled it. Put it back on and used it for two or three hours and it didn't gain at all. A couple days later I used it and it gained about half inch in probably three hours. It's a cast iron Diesel Kiki pump. Any suggestions on what to do next would be greatly appreciated.

 

[ptsg]

Since you rule out all the possible sources from being fuel, I would say the issue is in the hydraulic pumps.

Usually, it's the shaft seal of the hydraulic pump(s) that fails and lets fluid get inside the engine, since those pumps are mounted in the timing gear cover.

 

[Roadworthy]

I agree with ptsg. If the seal is leaking the hydraulic fluid goes straight to the oil pan. I went through two hydraulic pumps on my Mitsubishi tractor for the same issue.

 

[OldTrix]

That is my guess as well, as that just happened to me. Was digging away with the backhoe and turn around to a nasty cloud of exhaust smoke. By the time I could get in the cab, it was on runaway from an overfilled crankcase.

 

[Irv1Dehut]

Thanks for the replies, I appreciate it.
The hydraulic pump is a good suggestion I never thought of but I don't think that's the problem because I took the injection pump apart and after I put it back together it didn't gain any oil for several hours or more (probably more like six or eight hours. I should have also said that I put fluorescent
die in the fuel tank and now it's in the engine oil. Before I took the pump apart it would gain a lot on the dip stick in a short amount of time(Like probably an hour). Now that it's gaining again it's at a lot slower rate than before. Today I took the pump apart again and polished the fuel needle valves and seats and put new springs on top of the valves. It starts and runs good. Tomorrow I'll give it a work out and report back. Also when I do find out what the problem is I'll let every body know.

 

[RayIN]

I had leaking injectors fill the crankcase once. Rather than try to find the leaking ones, I replaced all of them. No more making oil

 

[redman135]

If diesel is getting into the crankcase, check the seal on the injector pump driveshaft to timing chain as they can fail and fill the crankcase with diesel.

 

[hayden]

Draw an oil sample and get it analyzed. That will tell you what's in the oil so you don't have to guess.

 

[Irv1Dehut]

I bought one injector and swapped it out for each injector.Didn't solve the problem
Pump doesn't have a driveshaft, it's driven by a cam below and has followers in the bottom of the pump.
I'll run it tomorrow and if I still has the same problem I will have the oil analyzed.

 

[Skypuppy]

If that was on a car, I'd guess leaking head gasket.

 

[Mike1955]

Sometimes we get a bit complacent. We are all led to believe it’s diesel. But how is you hydraulic oil level? If by chance that’s what’s getting into your crankcase your sump may be getting low. Just thinking without any outside influence. Good luck mann

 

[joecdeere]

Have you checked the diaphragm in the mechanical fuel pump?

 

[coast40]

Have you checked the diaphragm in the mechanical fuel pump?

I have a similar issue on my Bobcat 331's Kubota 2203. Getting a new lift pump first. $20-50 for a fried rice version NO!, $120-135 for genuine Kubota YES!, plus s&h. $216 from Mess... My hydraulic pump is attached with a bell-housing with no apparent way for hyd oil to get into crankcase.

 

[Little Red Tractor]

Draw an oil sample and get it analyzed. That will tell you what's in the oil so you don't have to guess.

I think that's the ONLY way to be sure you know where to go looking.

 

[bmaverick]

B20 Kubota TLB. It was gaining probably an inch on the dipstick in an hour. I replaced the fuel pump with an oem from Coleman's Kubota. Still gaining the same. Next I removed the injection pump and took it apart and didn't see anything wrong with it, just cleaned and reassembled it. Put it back on and used it for two or three hours and it didn't gain at all. A couple days later I used it and it gained about half inch in probably three hours. It's a cast iron Diesel Kiki pump. Any suggestions on what to do next would be greatly appreciated.

If it looks clean, bottle it and make more. With the price of oil these days, you will have the magic oil making machine as an oil tycoon.

 

[WinterDeere]

Draw an oil sample and get it analyzed. That will tell you what's in the oil so you don't have to guess.

Is that true? This is diesel, not gasoline. I think their primary means of detecting diesel in crankcase oil is a simple viscosity test, which could be reading low due to other factors, such as low-viscosity hydraulic oil in the crankcase.

Are you actually sure that they can differentiate diesel from low-viscosity hydraulic oil, in a standard oil analysis test?

 

[Hay Dude]

To make sure it’s diesel, lay a paper towel on a clean flat surface, pull dipstick and “flick” dip stick at the paper towel. If there’s diesel present, it will run outwards from the middle of the oil stain.

 

[repete]

To make sure it’s diesel, lay a paper towel on a clean flat surface, pull dipstick and “flick” dip stick at the paper towel. If there’s diesel present, it will run outwards from the middle of the oil stain.

Why does this remind me of checking for cerebral spinal fluid in the blood of trauma patients....

 

[WinterDeere]

Why does this remind me of checking for cerebral spinal fluid in the blood of trauma patients....

Surgeons are just the highly-trained "mechanics" of the medical world.

 

[repete]

Surgeons are just the highly-trained "mechanics" of the medical world.

Maybe instead of saying "trauma patients" I should have said check for a "cracked block"...