GalwayBoy
Bronze Member
I've been having ongoing engine issues with my 4120.
(Tractor is @ 39 months and 660 hours)
Engine will sputter at times, then come back up to speed.
Often seems like it's down on power.
Today it was warm enough (38) to actually go out to the barn and find out why.
Checked the fuel return line to the tank - nothing but a dribble.
Hmmm. Filter was recently changed. Possibly a gelled filter? I'm using winter fuel with P/S added. Pumped the primer, to find fuel @ the outlet.
Checked for flow @ the filter inlet while cranking the engine- nothing at all.
Checked for fuel @ the transfer pump inlet, and had flow from the tank.
Pulled out the transfer pump to find that the plunger rod is stuck, and will not return from the pump.
I used some #600 paper and was able to get satisfactory movement of the pump rod, and put it all back together. Tractor now runs as it did when I bought it. Not even a hiccup.
The odd thing was that throughout this ordeal, the fuel primer would bring fuel up to the filter, but would never get hard. Nor would it feel hard with the engine running.
It appears that the integrated injectors were drawing whatever fuel was available, thereby acting also as suction pumps?
I don't know exactly how long this has been going on, but my machine hasn't felt quite right for months. I'm happy to have figured it out, and happier still that it's not the injectors.
Now how a pump with 660 hours siezes is a mystery to me.
Jon
(Tractor is @ 39 months and 660 hours)
Engine will sputter at times, then come back up to speed.
Often seems like it's down on power.
Today it was warm enough (38) to actually go out to the barn and find out why.
Checked the fuel return line to the tank - nothing but a dribble.
Hmmm. Filter was recently changed. Possibly a gelled filter? I'm using winter fuel with P/S added. Pumped the primer, to find fuel @ the outlet.
Checked for flow @ the filter inlet while cranking the engine- nothing at all.
Checked for fuel @ the transfer pump inlet, and had flow from the tank.
Pulled out the transfer pump to find that the plunger rod is stuck, and will not return from the pump.
I used some #600 paper and was able to get satisfactory movement of the pump rod, and put it all back together. Tractor now runs as it did when I bought it. Not even a hiccup.
The odd thing was that throughout this ordeal, the fuel primer would bring fuel up to the filter, but would never get hard. Nor would it feel hard with the engine running.
It appears that the integrated injectors were drawing whatever fuel was available, thereby acting also as suction pumps?
I don't know exactly how long this has been going on, but my machine hasn't felt quite right for months. I'm happy to have figured it out, and happier still that it's not the injectors.
Now how a pump with 660 hours siezes is a mystery to me.
Jon