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855 cummins injectors
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coastalBend
Posted 11/24/2013 10:55 (#3465871)
Subject: 855 cummins injectors


south texas
8970 seems to be using to much fuel and we finaly got a good rain to be shut down for a week or more. The 855 is an nt big cam, cant remeber the series. Have already installed the manual pt pump. Done lots of 404,466 jd and 5.9cummins but never a common rail system like the 855. From the book it seems a good dial type torque wrench will set the valves and injectors. Any tips on removing injectors for service, reinstalling and running valves?
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a4t-1600
Posted 11/24/2013 11:04 (#3465897 - in reply to #3465871)
Subject: Re: 855 cummins injectors


Dearfield Co.
To clarify the torgue wrench isn't for anything but the injs,and depending on the cpl of the engine not all inj will use a torque setting for travel.You will need some small heal bars to pull them if you dont have a puller and a inj tube cleaner brush.After you get them out brush well then put a red rag around the brush and wipe the tubes out.Lube orings well and you sill need to postion them and snap them in with the heel of your hand.If you miss this step the torque on the hold downs will be wrong.Get a book for you engine and follow it from here on out.If you have top stop inj the overhead set procehdure can be different than the torque method even though you can short cut it and use the torque but I dont reccomend it.Most ag engines had the older non top stop inj in them so you need to be positive what you have first.The hold downs are critical or you will end up pulling the head for new inj coppers.If you strike water when they are pulled you will see it on top the piston.There are several ways to deal with this issue one is to ignore and the other is to pull the head and fix the inj coppers
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dakotadirt
Posted 11/24/2013 11:52 (#3466000 - in reply to #3465871)
Subject: Re: 855 cummins injectors


how many hours on them? big cam injectors themselves generally give very little trouble. have you checked other things like air filter, turbo, charge air leaks, etc? not saying the overhead shouldn't be done but you may want to look things over closer before you lay the blame on bad injectors.
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coastalBend
Posted 11/24/2013 12:12 (#3466033 - in reply to #3465871)
Subject: Re: 855 cummins injectors


south texas
Dont know hours since preowner had motor replaced but dont know if inj work was done. Going to check all prelemnary items but looked over in feild and didn't see any problems except for a few head to exaustmanifold leaks that will be fixed as well. No really using any more oil than past but fuel burn is definatly higher than last year. Burning about 1 gal acre pullimg a 37fft chisle 8in deep over 12in ripped ground. Seems too much fuel.
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dakotadirt
Posted 11/24/2013 12:31 (#3466063 - in reply to #3466033)
Subject: Re: 855 cummins injectors


exhaust manifold leaks can waste fuel, decrease power, increase smoke, and/or cause heating. turbocharger doesn't get driven like it should.
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7720gas
Posted 11/24/2013 12:41 (#3466075 - in reply to #3466033)
Subject: Re: 855 cummins injectors


have your fuel tested for btu's/gal !

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dieseldoc
Posted 11/24/2013 14:02 (#3466218 - in reply to #3465871)
Subject: RE: 855 cummins injectors


Iowa
is it a top stop or stc engine. makes a big difference.
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scott nelsen
Posted 11/24/2013 16:27 (#3466537 - in reply to #3466218)
Subject: Re: 855 cummins injectors


Leeds, North Dakota
Easy way to find out on injectors, loosen rocker, slide aside if its a step timing injector you can pull spring and plunger out, should be a # on block if id tag is gone, or call mother deere and get build sheet, Scott.
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coastalBend
Posted 11/24/2013 15:18 (#3466383 - in reply to #3465871)
Subject: Re: 855 cummins injectors


south texas
Im not sure what stop top or stc is. Its in a jd 8970. Says nt on motor. Id plate is gone.
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copper105
Posted 11/24/2013 15:35 (#3466424 - in reply to #3465871)
Subject: Re: 855 cummins injectors


NE Illinois
Stc motor will have a oil line across top of rocker box.
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coastalBend
Posted 11/24/2013 15:54 (#3466474 - in reply to #3465871)
Subject: Re: 855 cummins injectors


south texas
Do u mean inside the rocker cover or along the top of the head next to rocker covers?
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a4t-1600
Posted 11/24/2013 17:18 (#3466653 - in reply to #3466474)
Subject: Re: 855 cummins injectors


Dearfield Co.
outside the head---------if you pul lthe cover off you should see some plastic oil galleys some were white others were a corral color for the step time.To set those inj you need the cummins tool to do it right and like I said before you can short cut them but I dont want to try and tell you how incase you would get on the wrong stroke.The STC inj are expensive as they have a little hydralic lifter like device inside the plunger assembly to increase inj pressures.You really needto ID the engine as I have seen several that have had serious enough modifications to throw off the first timer

Edited by a4t-1600 11/24/2013 17:19
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