John Deere 4020 slobbering/ wet stacking

Josh M.

Member
Location
Northeast Ohio
Me and a buddy just did a complete overhaul on his 4020 and finally got it broke in on the dyno today. Tractor runs really good but seems to slobber out of 3, 5, and 6. Will this clear up after a while or do we need to make some adjustments? We also could only seem to get 85 horse out of her, could timing be an issue there? It has an entirely new rotating assembly, new cam, head was sent out and rebuilt along with the injection pump, and all new injectors.
 
Your engine oil; is it a break-in oil?? Check injector pump timing to the engine?? In the pass, John Deere piston and sleeve sets came with a card with instructions to follow for engine break-in.. use on a dyno at different speeds and loads for certain length of time.... Keep up engine coolant temperature to the high side. Do not let the tractor sit and idle.. With the rebuilt engine, when tractor is running for the first one hundred hours try to keep tractor on a load.. It needs time to seat-in all the new pieces??
 
It has break in oil in it, and we also followed that break in procedure. Hes got it on a twin screw feed mixer and itll work it pretty good, I guess well just wait and see if it clears up.
 
Forgot to mention we set the pump based on the settings in the service manual. Set it at TDC mark and align marks in the inspection plate of the pump. Maybe the pump shop set the fuel a little light, not sure and we arent going to touch it if timing is correct.
 
Try switching the fuel injectors to different cylinders. If the problem follows the injector then that is the problem. Did you reset the valves with the engine hot?
 
The Zinc in the oil has been removed or reduced,,I put a pint of Lucas Zinc additive in when I over haul,,I put 2 in larger oil pans,,this seems to help with the rings seating,, then run the tractor as you always would,,break in instructions dont mean much...
 
Yes, re-torqued head and reset valves after the break in. The head was still pretty hot. I probably wont be over there for a week so Ill let him put a few hours on it, if it keeps up Ill swap injectors around, the ones he ordered did seem to be pretty low quality so its definitely a possible cause.
 
Slobber normal until broke in and would be my guess since its coming out of the manifold essentially all along it. So fuel pump was rebuilt. Tested? Sounds like it might be a little light on the fuel delivery if theres not a miss. On the next generation the smoke screw is easy to adjust but I havent ever touched one of those round pumps on a 4020 just replaced with reman since most people arent out pulling the guts out of the auger tractor. 4440 1/4 turn was 30 horse.
 
I always have used the John Deere reman injectors never had a problem with them . I had a 4020 do the exact same thing injectors solved the issue on that one . Keep it under load and follow the instructions on the break the more you let it loaf the longer it takes to break in . About 5 hours on the dyno at varying loads then a good load after that is the best . Use John Deere or another break in oil
 
Yeah I also thought about that dyno being out of wack too. Its the same dyno that gets used at atleast 3 of the tractor pulls around here, and I had remembered that all of our tractors we dynod last august were 10-15 horse less than what they were the year before. Especially our tw-35, it had just been dynod at the dealership at 185. We got first place in the pull and had to dyno it again and it only turned 168, we kinda knew that it wasnt reading quite right.
 

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