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Have a 8970 with 855 cummins with about 3700 hours on it. Had a mechanic change the injectors on it last year. This spring noticed the oil level raising on the dipstick. Changed oil after 100 hours and had the oil sent to a lab came back 22percent diesel. Where do we start looking for the problem. Thanks.
 

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Hope your mechanic didn't put some cheap injectors in it or screwed up somewhere? Injector could be shot spraying a straight jet chewing out the bore or piston & leaking diesel into the sump that way.
Also could simply be a seal gone on your diesel pump to the drive cog leaking diesel through?
Any noticeable difference in smoke on start up or while working under load, loss of power, hard to start etc?
 

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I would start by using a temperature gun to check the exhaust manifold temperature for each cylinder. If there's a cool one, that will be your problem injector.
 

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Me too. But since I am here we had the same problem with our JD 4955. We traced the problem to the injector pump, had the injector pump rebuilt and it worked great.
 

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I would start by using a temperature gun to check the exhaust manifold temperature for each cylinder. If there's a cool one, that will be your problem injector.
If you do this you got to remember that the cylinders closest to the fan(water pump) will be cooler and as you go back they will get hotter.
 

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If you do this you got to remember that the cylinders closest to the fan(water pump) will be cooler and as you go back they will get hotter.
Not unless you have dual fuel line installed then they should all get the same fuel and be relatively the same temp. Right AB?
 

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i have dealt with this issue numerous times, and the likelyhood of an o ring issue is the foremost problem that can and does occur. if the mechanic that installed them cannot sort it out, then as mentioned track the cylinder temp exhaust to try and locate and isolate the offending one. not likely that the injection pump is an issue as they have a double seal and a weep hole on the pump drive. not the first time this issue has arisen..
 
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