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Fuel return line - 861D

S

sundvl76

Member
I have the rocker cover off to see if I can determine why diesel fuel is leaking into the crankcase. My belief is that this is happening mostly when it is running, b/c I always shut off the fuel when I'm done using it, yet there's still fuel getting in. (Nonetheless, I have also replaced the cup seals on the pump.)

Question is, where does the return line typically leak? I'm not really in a position to start the engine at this point to observe, so where do I begin looking, or what seals should be replaced? The fuel tank is off, so I have good access.

Can the line be pressurized and tested somehow?

Thanks for any advice.
 
The umbrella seals on the fuel pump shaft.
I would guess that the fuel return line is on the outside of the
engine and can't leak into the crankcase.
 
The return line should have a copper washer on top and bottom of the banjo fitting on each injector and you will want to make sure the line doesn't have a crack in it.

Mark
 
I grew up in john deere country. One small farmer that way ---》hand a farmall, and another farmer that way 《---- had a moline. All the bigger farms had john deere.
 
Actually the more I think about it, I never saw a ford until last year on a tractor ride. It was pretty, the guy had it painted up really nice.
 
(quoted from post at 01:07:42 05/27/16) The return line should have a copper washer on top and bottom of the banjo fitting on each injector and you will want to make sure the line doesn't have a crack in it.

Mark
Click to expand...

Thanks, Mark. Guess I just need to remove the header line and inspect it closely?

Seems that someone in another post commented about an O-ring near the T fitting - don't see anything about it in the shop manual, is there such a thing?
 

The injection pump on the early fords have two umbrella seals and a oring that prevents fuel from leaking past the pump drive shaft into the crankcase.
Replacing these seals is the first thing to do if you're getting fuel into the engine. I recently purchased a 881D that has fuel in the oil pan and have purchased the seals to go in the pump when I get the tractor in the shop.
The return lines are inside the valve cover and can leak fuel into the crankcase, but 95% of the time it's the umbrella seals in the inj pump.
 
And yet you saw fit to tell a guy how his ford couldn't have diesel in the oil from the injectors, when you admittedly know ...0? About them.

About what I expect I guess...
 
(quoted from post at 17:54:49 05/27/16) And yet you saw fit to tell a guy how his ford couldn't have diesel in the oil from the injectors, when you admittedly know ...0? About them.

About what I expect I guess...
Click to expand...

SG, to be fair, it was "screwloose" who didn't know where the return line is. However "Destroked" obviously didn't read my question before offering advice either. . .

To both: Read the original post, please - I've ALREADY REPLACED the cup/umbrella seals, as stated. I'm looking for all possible causes of the leakage.

Thanks.
 

Sorry: I read about replacing the cup seals on the pump before I had finished my second cup of coffee and didn't interrupt it as the umbrella seals in the pump.
The 850 I grew up on was gas and I traded my 871 diesel back in 91 for the three cylinder 4000 I have today, so I'll have to relearn a few thinks I've forgotten over the years when I start working on the 881.
 
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