I am new here and also new to working on a kubota diesel, hence the name. So dont laugh too hard.
The engine is hard to start and surges idle to mid throttle but then smooths out at higher RPMs. Any suggestions, thanks in advance.
Background for those who are interested:
My injection pump was leaking fuel at one of the nozzles. So I decided I would replace the internal orings, made alignment marks, pulled nozzle replaced orings and reassembled. The mower ran better than ever with more power for about three hours. Upon completion I noticed the injection pump was leaking more fuel than before out of the other two nozzles. So same process as before but struggled to get the rear nozzle (cylinder 1? farest from water pump) out and back in, the plunger would not stay centered so I had to jack up mower plus use a little oil to keep it aligned so I could reinstall the nozzle. But afterwards injection pump would not prime, fuel at air bleed screw but would not flow through the nozzles. So I decided to pull the whole pump assembly, but that didnt work it would hang about a 1/2" above block and I didnt want to pry. So tried pulling speed control plate but didnt want to get into that mess of disconnecting the internal spring to release. So I replaced the gasket because there wasnt one on it, evidence of someone tampering with it and reinstalled. In the process found a second bleed screw on the top of the injection pump below the intake manifold. I opened and bled air out and now had fuel at nozzles. Bled the hp fuel line to injectors and boom she started but with surging issues described above. I did add some diesel fuel treatment/injector cleaner to tank before starting, probably a bad idea.
Several things I noticed that concerned me:
1. someone had put grey pematex to seal injection pump to block along with factory shims but I dont think a gasket is needed there.
2. a small fuel leak has now developed one of the fuel line connectors above the injection pump.
3. how can I test if the fuel overflow system is working? Is it possible to have a blockage and not bypass fuel back to tank? Thus causing fuel leaks. Can I just blow air through tubes and injectors back to tank?
Wow that was TMI but thanks for reading.
The engine is hard to start and surges idle to mid throttle but then smooths out at higher RPMs. Any suggestions, thanks in advance.
Background for those who are interested:
My injection pump was leaking fuel at one of the nozzles. So I decided I would replace the internal orings, made alignment marks, pulled nozzle replaced orings and reassembled. The mower ran better than ever with more power for about three hours. Upon completion I noticed the injection pump was leaking more fuel than before out of the other two nozzles. So same process as before but struggled to get the rear nozzle (cylinder 1? farest from water pump) out and back in, the plunger would not stay centered so I had to jack up mower plus use a little oil to keep it aligned so I could reinstall the nozzle. But afterwards injection pump would not prime, fuel at air bleed screw but would not flow through the nozzles. So I decided to pull the whole pump assembly, but that didnt work it would hang about a 1/2" above block and I didnt want to pry. So tried pulling speed control plate but didnt want to get into that mess of disconnecting the internal spring to release. So I replaced the gasket because there wasnt one on it, evidence of someone tampering with it and reinstalled. In the process found a second bleed screw on the top of the injection pump below the intake manifold. I opened and bled air out and now had fuel at nozzles. Bled the hp fuel line to injectors and boom she started but with surging issues described above. I did add some diesel fuel treatment/injector cleaner to tank before starting, probably a bad idea.
Several things I noticed that concerned me:
1. someone had put grey pematex to seal injection pump to block along with factory shims but I dont think a gasket is needed there.
2. a small fuel leak has now developed one of the fuel line connectors above the injection pump.
3. how can I test if the fuel overflow system is working? Is it possible to have a blockage and not bypass fuel back to tank? Thus causing fuel leaks. Can I just blow air through tubes and injectors back to tank?
Wow that was TMI but thanks for reading.
