Have a 98 deere 6410 mwfd that is our haying tractor and for the last 3 season it puffs fuel smoke at cold start (yesterday was 70 out) and heavy load decelerating, like coming down a hill with a implement behind it. It has a very subtle "lugging" at idle when cold start and can hear a subtle roughness at high speeds like 2000rpm. Cant see smoke when hot but can smell its running rich. Starts right up, good power but seems a little thirsty. Tractor has like 4000 hours on it, all cushy haying hours only during summer.
It did this in 2016 also and I fixed it with new deere injectors and fuel filter.
I got a dud in tank pump from Deere last year and ran one day without a functional lift pump in the tank- it had a dead short directly from Deere.
EGTs vary cylinder to cylinder by 100 degrees -for example #1 runs 90 degrees cooler than 2 or 3 at idle
Turbo is tight, no oil use.
This time I cannot get it fixed - This is what I've done:
-new injectors (deere, but chinese standynes)-
-new in tank pump and module (thought it might be sucking air)
-coated seams on one way check valve in feed line (thought sucking air)
-blew lines out feed and return
-several new lines between filter and housing and IP
-was running power service or standdyne lubricity additive
Local diesel mechanic/ dairy farmer said I prbably need a new IP. I want to be sure before I drop 2500 with deere again. Some post online said there is a valve on the IP that catches trash- I took fittings apart for the return line but didnt see any trash or valve.
Any suggestions welcome.
Working theory is that the clogged filter in 2016 and lack of lift pump last year wore out the IP.
next step would have been to take apart fuel filter housing to check for cracks
It did this in 2016 also and I fixed it with new deere injectors and fuel filter.
I got a dud in tank pump from Deere last year and ran one day without a functional lift pump in the tank- it had a dead short directly from Deere.
EGTs vary cylinder to cylinder by 100 degrees -for example #1 runs 90 degrees cooler than 2 or 3 at idle
Turbo is tight, no oil use.
This time I cannot get it fixed - This is what I've done:
-new injectors (deere, but chinese standynes)-
-new in tank pump and module (thought it might be sucking air)
-coated seams on one way check valve in feed line (thought sucking air)
-blew lines out feed and return
-several new lines between filter and housing and IP
-was running power service or standdyne lubricity additive
Local diesel mechanic/ dairy farmer said I prbably need a new IP. I want to be sure before I drop 2500 with deere again. Some post online said there is a valve on the IP that catches trash- I took fittings apart for the return line but didnt see any trash or valve.
Any suggestions welcome.
Working theory is that the clogged filter in 2016 and lack of lift pump last year wore out the IP.
next step would have been to take apart fuel filter housing to check for cracks