engine oil

[DRD in Pa]

Is it possible for a gas 801 to pump hydraulic fluid into crankcase? Is this a common problem? Is it a simple repair or a big problem to repair?

 

[Fordfarmer]

No experience with that happening, but I'd say your 801 has blown a seal on the hydraulic pump. Since it's mounted at and driven off the rear of the engine, a bad seal could let oil into the crankcase.

 

[Keith Williams]

Short answer is YES.
My 1964 4000 just started doing the same thing.
If my guess is correct, the shaft seal on the hydraulic pump has gone bad. My engine is about a quart high so I am taking the pump off to get it fixed.

Someone else can help us with how hard a fix this is.

I was running it to verify the oil was gaining when I ran a stick into the radiator. (see thread below)
Good luck
Keith

 

[TX641D]

DRD,

I just repaired this exact problem on my 641d. High pressure tube which runs thru the tranny case ruptured, causing the hydraulic pump to pull fluid from the rear sump via the suction line then into the tranny via hog pressure tube. It is documented in posts a few pages back from me. The guys here showed me how to sleeve that broken tube without a tractor split. You can call me if you'd like to chat about it.

210 287 5667 cell
Steve

 

[WA-Hal]

I suppose it COULD happen, but the seal on the hydraulic pump is on the suction side of the pump. If that seal is leaking, I would expect air to be sucked into the hydraulic system from the crankcase. And since the hydraulic reservoir is lower than the pump, I would not expect hydraulic oil to travel up to get into the crankcase when the engine is not operating. With a bad seal, I would expect the hydraulic pump to lose prime often.

Has the hydraulic oil supply gone down at the same time the engine oil is getting more full? Does the crankcase oil seem to be getting thicker and more viscous? If the answer is no to either or both of those questions, I would suspect dilution with fuel, or maybe coolant. If the engine is a diesel, fuel could be leaking from a break in the return line or the seals in the injection pump might be leaking. If the engine is a gasser, it could be running way too rich, or possibly the gas valve was not turned off. Coolant will make the oil milky looking.

I would change the crankcase oil ASAP. If the contamination is gasoline, a small amount of the drained oil should very easily catch fire if you try to light it with a piece of burning paper. Diesel contamination will make the oil very thin.

Changing the seal in the hydraulic pump is not exactly easy. The problem is that you first have to remove the bearing cone from the housing to get to the old seal. None of my tools let me remove that bearing cone without ruining it, as there was no way to hook the edge of the cone. It also took quite a lot of time, grinding the cone out. Of course, it also required a new bearing and cone as well as the new seal.

I would make real sure that the contamination is actually hydraulic oil before I ever tore into the hydraulic system. Good luck!

 

[souNdguy]

i'd for sure check the hyd pump seal. not ahard job to pull it.

soundguy

 

[WayneIA]

I agree with WA-Hal .Very unlikly that hyd oil is getting into the engine altho possible.
To remove the pump seal, take a welder and run a bead on the bearing race so it will drop out. Than remove the seal and probably the shaft needle bearing. So you will need a needle bearing , a bearing cup and a hyd pump seal

 

[Larry NCKS]

(quoted from post at 15:55:31 12/17/10)
DRD,

I just repaired this exact problem on my 641d. High pressure tube which runs thru the tranny case ruptured, causing the hydraulic pump to pull fluid from the rear sump via the suction line then into the tranny via hog pressure tube. It is documented in posts a few pages back from me. The guys here showed me how to sleeve that broken tube without a tractor split. You can call me if you'd like to chat about it.

210 287 5667 cell
Steve

Don't think you understood his problem. He likely has a pump seal leaking as others have said.