YM240 Fuel in Oil?

[Maverick22]

Went to start tilling the garden today with my YM240 and noticed oil dripping from the breather before I even turned on the PTO, I checked the oil and it was really thin and way over-full. I drained it and there was almost 2 gallons in there, I know the crankcase only holds a gallon so there's a problem somewhere. The radiator is full so I can only assume it's fuel. I took a sample and it hasn't separated so I don't think it's water. I last used this tractor a month or so ago to move snow and it was fine then, so it's happened since. I put a gallon of oil in it and went ahead and tilled a section of the garden and it runs fine, no smoke. After running about 30min there wasn't any noticeable increase in the oil. The engine was rebuilt a few years ago and only has maybe 200 hours on it since then. Any ideas what it could be?

 

[winston1]

Coolant, rain water, diesel, or hydraulic/transmission oil. That is your choices.

 

[normde2001]

Most likely fuel from a leaking fuel pump. just turn off the fuel when not in use and get on with your life.

 

[Maverick22]

Coolant, rain water, diesel, or hydraulic/transmission oil. That is your choices.

The radiator is full so I can eliminate coolant, it lives inside so it's never gotten rained on, the mix was way too thin to be hydraulic fluid but that's full as well so that leaves fuel.

Most likely fuel from a leaking fuel pump. just turn off the fuel when not in use and get on with your life.

I thought about that, do you think it's the injector pump that's leaking or is there a separate fuel pump on there? I probably should have shut the fuel off yesterday but wasn't even thinking about it.

 

[California]

YM240? The only fuel shutoff is at the fuel filter and the only pump is the injector pump.

 

[Maverick22]

YM240? The only fuel shutoff is at the fuel filter and the only pump is the injector pump.

Ok, so it's the injector pump - is there a seal on it I can replace or is it something internal and I need a new/rebuilt one?

BTW, what brand loader is that on your 240? I have one for mine that looks almost identical.

 

[California]

BTW, what brand loader is that on your 240? I have one for mine that looks almost identical.

The loader is Great Bend model 20-something. I was told Great Bend was in Kansas, and was sold to a competitor - I think Bush Hog - several years ago who continued the brand name for a couple of years.

I think this loader was dealer-installed because the tractor also has the optional loader-ready HD front axle, built heavier and adjustable width. The control valve was AICO before I replaced it last year. Is yours AICO?


Injector pump internals? I dunno.

 

[Maverick22]

The loader is Great Bend model 20-something. I was told Great Bend was in Kansas, and was sold to a competitor - I think Bush Hog - several years ago who continued the brand name for a couple of years.

I think this loader was dealer-installed because the tractor also has the optional loader-ready HD front axle, built heavier and adjustable width. The control valve was AICO before I replaced it last year. Is yours AICO?

I thought it looked familiar - I sent you a PM

My valve is a Cessna...but I'm going to need to rebuilt this one or get a new one before I put the loader back on it.

 

[California]

Thanks for the note.

Cessna is in Wichita, no? I'll be surprised if that valve is rebuildable. I was quoted rebulding @ 3x the cost of a new valve. So I got a Prince valve. Amazingly, Amazon had this in stock at the best price I found.

Here's a longwinded thread where I discussed installing the new Prince valve. Post #22 has links to a coupe of photos at various angles showing the loader in use, if you want to compare to your loader.

 

[Maverick22]

Cessna Hydraulics was actually in Hutchinson, it was a division of the plane maker in Wichita though. The hydraulic side sold in the 80's to Eaton though. Unfortunately you're probably right on the valve.

Wow! That's a dissertation, but a lot of information...I'll definitely re-read it when I get ready to put the loader back on.

 

[clemsonfor]

There is internal seals in the pump but there best left to a deisel shop to rebuild. There is a gasket or sealant probably where it mounts on the block but thats to keep oil in not fuel out. The problem is internal leaking from plungers im sure. Like norm said shut fuel off, worst thing is you may have to bleed your lines before you start. If you know the right process to do this is no big deal.

 

[normde2001]

No concern about bleeding . Have been shutting off fuel when finished for the day for 12 years for that reason, never had to bleed.

 

[clemsonfor]

if the fuel runs out of the pump through a leak in the pump there will be air in there right? your stopping the flow from the tank so how can it not have air if the tiny bit runs out of the pump/line while it sts?

 

[kenmac]

If you have leaky injectors. Turn the fuel back on , let it set for a few,and it will self bleed

 

[Maverick22]

Thanks guys, I'll probably run it this summer by shutting the fuel off and fix it right this winter. An injector pump isn't as much as I feared it would be. Sadly I do know the bleeding procedure, as much as I hate to admit it I've run it out of fuel more than once.

 

[normde2001]

if the fuel runs out of the pump through a leak in the pump there will be air in there right? your stopping the flow from the tank so how can it not have air if the tiny bit runs out of the pump/line while it sts?

You got me. . . mine has not leaked since I started shutting it off. Something to do with pressure I reckon.

 

[clemsonfor]

You got me. . . mine has not leaked since I started shutting it off. Something to do with pressure I reckon.

or vaccume?

 

[Maverick22]

I'll resurrect this old thread just to provide the resolution since I just now remembered I never did! So I had been using Normde2001's advice and had been shutting of the fuel every time I got finished using it (only 3-4x a year) and then changing oil/filter when it got thin but last winter I finally got it fixed. The pump was more than I wanted to tackle myself but luckily a new pump/injector shop opened up in town last year so they were kind enough to do the whole job. I will say they were not used to Yammer Hammer, they first thought something was broken inside but when I said they all sound that way they started diagnosing. They first thought it was the pump as well but took it off and tested it and it was fine so they checked both injectors, initially he thought both of them were fine as well but pressure started bleeding off an injector and he noticed a crack in a copper shim or busted o-ring or something so he rebuilt both injectors. I can tell you this thing had only been running on one cylinder for a long time! I hooked it up to the tiller after I got it home and what used to drag the tractor down and almost kill it, will now go through w/ no effort whatsoever. So just a word of caution to maybe check your injectors before replacing or rebuilding the injector pump.

 

[winston1]

Not understanding how diesel got in the crankcase through the injector? :confused3:

 

[Maverick22]

Not understanding how diesel got in the crankcase through the injector? :confused3:

Maybe I misunderstood but that's what I thought he said - I'm not an engine expert. Maybe it washed past the rings in the cylinder?