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
Super Member
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.
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
Elite Member
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.
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.
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
Veteran Member
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
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.
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.
