Hello, I just purchased a mf240 my first tractor. It is a 1988 model I think, it has a aftermarket fel I think because it’s green. It was fine for about two weeks but now I think the transmission oil is going into the crank case because it is blowing a lot of oil out the oil fill tube and the tube coming from the top of engine. You turn the key and it starts right up. The dip stick on the crankcase showed oil all the way to the top. I’m no where close to a diesel mechanic so how is the oil getting into the crankcase?
Massey 240 making oil!!!
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Roadworthy
Elite Member
Do not continue running the tractor, if the oil gets too full it can destroy the engine as pistons attempt to compress it. The likely culprit is a leak in your hydraulic pump which allows transmission oil into the crankcase. Pump replacement is generally a pretty easy task of you're at all mechanically inclined. I do them in the driveway. You can get a replacement pump from the dealer of course but I've had success with eBay and even Amazon may work. Good luck!!
JWR
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How many hours on it?
I doubt that the transmission oil is going into the crankcase. (Did you have some reason to think that?) The symptom you describe (blowing a lot of oil out the oil fill tube and the tube coming from the top of engine) is probably a serious issue. My first guess is that what you have is blow-by with combustion pressure leaking into the crankcase. That is a common thing when the rings/pistons/cylinder walls get worn badly enough that they no longer hold back the combustion pressure which then pressurizes your crankcase which then puts oil all over the place.
I'm not saying that is it but I will take bets. [Editing: Roadworthy got his comment posted while I was still typing mine. He might be right about it being an hydraulic pump leak since that WOULD put transmission fluid/oil into your crankcase.] You need to get the compression tested for each cylinder. Any mechanical shop can do that and it is not a big deal. The compression in each cylinder should be ballpark the same. The amount of compression is specified in the shop manual for your engine (my wild guess is like 170 psi but ignore that and get it looked up in the specs for your engine.)
If any cylinder is a lot lower than the rest then you know the rings/piston/cylinder wear in that cylinder are bad. If more than one is much lower than the specification pressure you know you have excessive wear. IF THESE THINGS SHOW on a compression test you are really face with an "engine overhaul" which involves new rings, teardown of the engine, putting new bearings in while you are in there, etc.
NOW, all that said if you are incredibly lucky (and I am wrong about it being cylinder blow-by) you might conceivably have crankcase gas recirculation ventilation plumbing plugged up or who knows. Have that checked before you do the combustion pressure test of course because cleaning out the tubing is far easier/cheaper than doing the compression tests. If you do not do your own engine work, go find a mechanic and get him to diagnose the problem.
Best of luck.
I doubt that the transmission oil is going into the crankcase. (Did you have some reason to think that?) The symptom you describe (blowing a lot of oil out the oil fill tube and the tube coming from the top of engine) is probably a serious issue. My first guess is that what you have is blow-by with combustion pressure leaking into the crankcase. That is a common thing when the rings/pistons/cylinder walls get worn badly enough that they no longer hold back the combustion pressure which then pressurizes your crankcase which then puts oil all over the place.
I'm not saying that is it but I will take bets. [Editing: Roadworthy got his comment posted while I was still typing mine. He might be right about it being an hydraulic pump leak since that WOULD put transmission fluid/oil into your crankcase.] You need to get the compression tested for each cylinder. Any mechanical shop can do that and it is not a big deal. The compression in each cylinder should be ballpark the same. The amount of compression is specified in the shop manual for your engine (my wild guess is like 170 psi but ignore that and get it looked up in the specs for your engine.)
If any cylinder is a lot lower than the rest then you know the rings/piston/cylinder wear in that cylinder are bad. If more than one is much lower than the specification pressure you know you have excessive wear. IF THESE THINGS SHOW on a compression test you are really face with an "engine overhaul" which involves new rings, teardown of the engine, putting new bearings in while you are in there, etc.
NOW, all that said if you are incredibly lucky (and I am wrong about it being cylinder blow-by) you might conceivably have crankcase gas recirculation ventilation plumbing plugged up or who knows. Have that checked before you do the combustion pressure test of course because cleaning out the tubing is far easier/cheaper than doing the compression tests. If you do not do your own engine work, go find a mechanic and get him to diagnose the problem.
Best of luck.
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I guess that would explain the overfill on the dipstick.Yes I can work on just about anything gas just never done diesel. I had no idea that it could come from the pump to crankcase. Thank you so much!
oldnslo
Super Member
Is your transmission low on oil? Does the engine oil look runny and smell like diesel fuel? On some models of tractors the fuel pump can leak diesel fuel into the oil if a seal fails?
Dmacleo
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didn't some 240s have the front mounted pump for FEL separate than the 3pt system? or am I thinking of different model?
not familiar with series so not sure if seal could leak into engine from there.
not familiar with series so not sure if seal could leak into engine from there.
5030
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If a transmission seal failed it would be coming out of the bellhousing bottom not in the engine oil as there is no way for the trans oil to get there.. I'm leaning towards a failed hydraulic pump seal that is allowing hydraulic oil to get in the crankcase.
The reason I think that is the oil is to the top of crankcase dip stick like there is a couple gallons of extra oil in there. It has 1500 hrs on it. With that much blow by wouldn’t it be hard to start? I’m sure it has some with its age but that doesn’t explain the crankcase being over full of oil it should not have any oil in it right. Thank you for taking the time to answer.
Thank you,this one gets it from the 3 pt system it’s tied to the plate under the front of the seat
Just went and checked the tractor doesn’t have an external pump it gets the oil from a valve just under the seat. You turn it one way the fel works turn it up and pto works. So I don’t see how it would get to engine. I c just checked the engine oil and pulled the dipstick out and oil is coming out.
