John deere engine

ally k

Anyone know what would be wrong with 6400 when idling the engine seems to be revving up couple hundred revs and then back to normal only happing couple of times a minute....(it's not a common rail engine) thanks in advance..

tomwaterford

ally k wrote: »

Anyone know what would be wrong with 6400 when idling the engine seems to be revving up couple hundred revs and then back to normal only happing couple of times a minute....(it's not a common rail engine) thanks in advance..

Drawing air somewhere in the fuel system....is it idling low and hunting for revs or is revving up from normal idle

ally k

No It's idling normal fuel filter was changed recently too ..

tomwaterford

ally k wrote: »

No It's idling normal fuel filter was changed recently too ..

I dont know that engine now...but check if there orings on the fuel filter


Does it happen the whole time or just intermittent

case5130

Would it be the injectors

ally k

Yes tom orings def on filter it happens all the time ..couple times every minute sometimes revs higher than others..pump fully done up last year don't know now could be injectors too ..

tomwaterford

ally k wrote: »

Yes tom orings def on filter it happens all the time ..couple times every minute sometimes revs higher than others..pump fully done up last year don't know now could be injectors too ..

It's hardly injectors....they usually cause smokey issues
It's not something stupid Like faulty throttle cable/springs on your pump

Double check your orings

ally k

Will hav another look in the morning thanks in meantime

omu

Hi ally

I have very similar issue in a 6200 and changed filters recently too. How did you get on with yours??

Thanks

ally k

It turned out pump inside diesel tank wasn't goin and therefore air was in the system when the key is turned on the pump should run and fill the filter .....so check ur pump is running first also they tend to build up lot of dirt over time on the gauze on bottom of pump...you will get access if u lift up rubber mat in cab on left hand side hope this helps...

Dawggone

Could be the governor of the injector pump be acting up?
When under full load does it carry on like that?

Had an old 10-60 Nuffield many moons ago that used to 'hunt' like that...some yoke when under pressure.

orm0nd

Dawggone wrote: »

Could be the governor of the injector pump be acting up?
When under full load does it carry on like that?

Had an old 10-60 Nuffield many moons ago that used to 'hunt' like that...some yoke when under pressure.

simms injector pump on the nuffields , rack used to stick in them