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Ford 850 engine oil leak

E

esbrian

Member
I was pushing snow the other day and noticed a pretty steady oil leak after about 20 minutes of operation. There was a very slow stream of oil running down the lower front cover of the bell housing just behind the oil pan. This is a Hundred series tractor so it doesn't have the structural oil pan.

There is no oil leaking from the clutch chamber, and although the cotter-key is missing from the weep hole, the hole is clear.

Is this likely to be something OTHER than an oil pan gasket in need of replacement?

Brian
 
Are you sure it is an engine oil leak versus a hydraulic fluid leak? The Hydraulic pump lines up along the right side of the engine with the possibility of that leaking down along the bell housing and front of the transmission housing. I would clean everything off, make sure the various oil levels are up where they need to be, start the tractor up, and observe watching at a close distance. Something maybe be slow leaking therefore harder to trace versus oil spurting out. Unless you know for sure it is engine oil I would put my money on the hydraulics.
 

Very good point - I am NOT sure that it isn't hydraulic fluid. I'll clean it up and run it to try to see exactly where it's coming from.

If it's a hydraulic leak, could I expect a noticeably different rate of flow with implement raised vs lowered?
 
It's possible and the speed of the hitch raising will slow as the reserve tank is depleted.
 
If it is enough of a leak, check the level of the engine oil and the hydraulic oil. One should be low and then you at least know which is leaking even if you haven't found the actual leak yet. If it is the engine oil, then be sure to keep it topped off as you search for the leak.

It's possible and the speed of the hitch raising will slow as the reserve tank is depleted.
Click to expand...

Not necessarily. As long as the fluid level is high enough that the pump doesn't suck air then the 3 point should continue to function normally, but if it is a hydraulic fluid leak, I would expect the 3 point performance to already be suffering no matter what the fluid level is.
 

Based on appearance I doubt I will have a noticeable loss of fluid in the hydraulic system. engine oil level is good.

A hydraulic leak makes a lot more sense to me now that I think about it. The leak stopped, or at least slowed to the point where it stopped dripping on the ground, as soon as I shut the engine off. I would think that engine oil leaking from the oil pan would continue leaking until it cooled down significantly, whereas a hydraulic fluid leak would be more likely to stop as soon as the pump stops generating pressure.

The hydraulic manifold connection to the transmission casting is sealed with o-rings, correct?
 
Darned if I can remember and I have an 860. Should be able to pull up a schematic on the New Holland parts site. In any event if either an O ring or gasket and it is leaking at that particular joint then whatever is in there will need to be changed.
 
I have an 850 also and from your description of the location as being "behind" the oil pan sounds to be engine oil, however you can tell the difference between engine and hydraulic unless both clean, then it would be close. Possible sources are: 1. Rear main seal; 2. oil pan gasket; 3. Cam shaft cover at rear of engine block; 4. Gasket leak where hydraulic pump mates with engine;(oil could run down the block; 5. hole in oil pressure gauge line which runs to instrument cluster on right side of block (oil would run down the engine block) 6. O-ring between hydraulic manifold and block (would seem unlikely by your description); 7. hole in hydraulic tubes( unlikely as oil would be seen leaking out weep hole in trans. I can't think of any other sources.
 
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