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861 diesel fuel getting into engine oil

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07-19-2020 10:37:17

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I had the head rebuilt on my 861 diesel two weeks ago. The machine shop cleaned and blasted the head,installed new guides,seats and valves. After installing the head and and running the tractor some, diesel was getting into the engine oil. We then replaced all the bronze crushwashers and found that we needed a rubber sleeve on the return/over flow line. I may not have the correct terms. Our New Holland dealer said it was just a small piece of hose that was compressed around the tube from the flare nut. They did not have the proper part, we found a rubber grommet that fit so used it. Now after running the tractor for about 4 hours with a brush hog, there is diesel in the engine oil again. I'm suspecting the rubber grommet we used is leaking again. What do you use the remedy this? What else should I be looking for as a possible fuel leak?
I'm guessing that the fuel is entering the engine oil by gravity from the fuel tank, but I don't know that for sure.

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07-20-2020 16:35:52

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 Re: 861 diesel fuel getting into engine oil in reply to ChrisS, 07-19-2020 10:37:17  
The return line set can crack where the fittings connect.

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07-19-2020 13:45:49

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 Re: 861 diesel fuel getting into engine oil in reply to ChrisS, 07-19-2020 10:37:17  
As Showcrop mentioned, it can be pump drive shaft seals too. If the governor is erratic at all pump needs repaired as the retainer ring is failing inside, which also causes seals to leak. Could also be the return line bolt gaskets, or line itself. I had to replace the small grommet in head on both 871 and 6000 diesels I have too. If I recall it's 3/16 inch size I have on hand for other applications also.

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07-19-2020 10:45:36

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 Re: 861 diesel fuel getting into engine oil in reply to ChrisS, 07-19-2020 10:37:17  
It can be the seal on the return line but much more frequently it is the umbrella seals on the injection pump shaft. Quick, easy, cheap.

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