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Gas in the oil.......

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Tye

07-03-2002 16:15:43




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I keep getting gas in my oil on my JD 50. Can anyone help me identify some possible areas where this problem might be? Thanks. I appreciate any help on this.




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Clooney

07-03-2002 18:07:57




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 Re: Gas in the oil....... in reply to Tye, 07-03-2002 16:15:43  
Tye, G-Man has you on the right track. ~If your S/N is after 5016133, or you have an earlier one that has been converted to an automatic shut off, there is a good chance that is leaking fuel into the crankcase. Usually they don't leak into the carb though, the usual problem is the diaphragms fail & allow the fuel to leak back through the oil pressure line & into the crankcase that way.
~To test... run the tractor & get it hot, then shut it off & remove the oil pressure line going to the automatic shut off, then put a can or bottle under the line or open fitting leading from the shut off, for a night or so. If the can has gasoline in it [will have some oil also] you have a failed diaphragm. ~Last I checked those diaphragms are still available from Deere.....

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G-MAN

07-03-2002 16:45:21




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 Re: Gas in the oil....... in reply to Tye, 07-03-2002 16:15:43  
Tye, I'm thinking two things here. I'm not sure about one of them, so I'll give you the one I am sure of first. If your tractor has a manual fuel shut-off valve at the sediment bowl, you need to shut this off when you stop the engine. You probably have a leaking carb needle and seat allowing gasoline to enter the cylinders and drain into the crankcase when the engine is shut off. You could fix the carb to prevent this, but it is still good practice to shut off the fuel, in case a leak develops. The one I'm not sure of is the possibility that your tractor has an automatic fuel shut-off, which uses oil pressure to turn the fuel supply to the carb on. When the engine is off, no fuel can get to the carb (ideally). This was invented to eliminate the need for shutting off a manual valve, but they can and do leak, and when combined with the leaking needle and seat I mentioned above, will lead to gas in the crankcase. I'm not sure if the 50 has the auto shut-off or not, so you'll have to check. If it does, remove the sediment bowl and see if gas drips from the little seal in the center of the bowl housing. Someone with more early number tractor experience can tell you if your tractor has the auto shut off for sure - I know it was used on the later number tractors, as I rebuilt one on a 630. Hope this helps with your problem.

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