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JD50 fuel shutoff, manual vs. oil pressure??

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Guy

12-18-2001 09:53:06




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My 53 model 50 has a manual fuel shutoff instead of an oil pressure shutoff. The existing is leaking fuel and needs replaced. Should I replace it with an oil pressure version or is there no real advantage? I am relatively new to older John Deeres but have heard that many of the old Deeres leaked fuel into the oil and to ALWAYS make sure the fuel is shut off when not in use. Is this true and would I still need to worry about this with an oil pressure unit? John Deere dealer tells me I can buy either units brand new. Just wondered which way to go. Thanks for any help!

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Rory O

12-24-2001 14:24:12




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 Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Guy, 12-18-2001 09:53:06  
Well here is my take on the oil pressure fuel cut off. I always figured it was there to make sure the engine had sufficient oil pressure built up before allowing fuel to flow and the engine to start. I never thought that they would be used in place of a manual stopcock.



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Guy

12-20-2001 13:03:04




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 Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Guy, 12-18-2001 09:53:06  
That would make sense really. I think I have heard enough to justify the manual shutoff!!



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Rayburn

12-20-2001 13:06:13




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 Re: Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Guy, 12-20-2001 13:03:04  
If you read Clooney's responce that's what belongs on it anyways>>>>>>



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Guy

12-21-2001 06:11:40




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 Re: Re: Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Rayburn, 12-20-2001 13:06:13  
I realize that as that is what is on it now and it is original. What I was hoping to get, (refer to my original post), was some input on possible advantages to going with the oil pressure version. I wanted to know pros/cons, which is exactly what the others offered. Now my decision is easier for me to make - exactly what I was looking for...



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Bob Weber

12-20-2001 11:25:46




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 Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Guy, 12-18-2001 09:53:06  
If a ruptured diaphragm will allow gasoline to get into the oil when not running, is there also a possibility that oil, under pressure, will be pumped into the carburetor when the engine is running? I haven't ever seen one of the automatic shut offs, but sounds to me like that would be the case.



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Joel Williams

12-21-2001 11:15:48




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 Re: Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Bob Weber, 12-20-2001 11:25:46  
YEP!!!!



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Joel Williams

12-20-2001 05:30:52




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 Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Guy, 12-18-2001 09:53:06  
A failure of the lower diaphragm on the auto shut off WILL definately cause fuel to leak into the crank case when the engine is not running. I can tell you this from hard experience. There are two diaphragms in the auto shut off and oil pressure comes in between the two. This pressure pushes down on the lower diaphragm and support plate which opens the little rubber seated shut off valve. The gas is on the other side of the lower diaphragm. When the lower one goes bad from age or whatever, the gas WILL flow from the tank up through the lower diaphragm and through the line from the oil gallery in the block that provides pressure to open the valve right into the crank case. I drained about six gallons of gas out of the crank case one day after it had set for about two weeks. The auto shut off also has a manual over ride knob (thumb wheel) on top of the assembly that has to be backed off all the way (tightened) to allow the shut off to work properly. If it gets jammed or corroded in the down position, it could keep the shut off from working. The upper diaphragm keeps the oil pressure from leaking out the top of the shut off. The only reason the manual over ride is there is to allow filling of the bowl after it has been removed for cleaning or other reasons. I took mine all apart, cleaned it up with my handy dandy little dremmel tool and put all new parts in it. To make a long story short, stick with the manual shut off.

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Nathan(GA)

12-18-2001 20:04:06




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 Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Guy, 12-18-2001 09:53:06  
I'd just put the manual back on it. You'll have to run a line for the oil pressure valve to work. Not that it's much work. The oil pressure shut off valve leaks about as much through the oil line as the manual from the people I've talked to.

Just do whatever makes you happy!



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Greg

12-18-2001 19:38:12




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 Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Guy, 12-18-2001 09:53:06  
My Dads 50 had one of the oil pressure fuel shutoffs. The diaphrams failed and caused fuel to get into the oil also. Replacement diaphrams were less than 3-4 dollars from Deere. I added one of brass manual shutoff valves (like the ones used in the manual fuel shutoffs units) to it. Now when he lets it set over the winter months he can shut it off.



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Clooney

12-18-2001 14:17:05




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 Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Guy, 12-18-2001 09:53:06  
Guy, it depends on your tractor, if an all-fuel (2 tanks) then it would always be a manual shut off. Seeing your tractor is a 53 & Deere didn't go the oil pressure shut-off until early 54 yours should still be a manual shut-off. I don't think the manual shut-off (strainer) assembly that Deere now sells is exactly original but should work ok.



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Phil

12-18-2001 12:01:37




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 Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Guy, 12-18-2001 09:53:06  
The diaphragms in the oil pressure units can go bad, but that won't be a cause of gasoline in the oil, as they operate a needle valve in the sediment bowl. I would lean towards one of these, as they are nearly foolproof...



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Pete

12-18-2001 15:34:32




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 Re: Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Phil, 12-18-2001 12:01:37  
Phil, Those diaphrams WILL cause gas in the oil if and when they go bad! I know this from experience on my 70. They are however easy and cheap to replace, and seem fool proof when they are good. Pete



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Jerry S

12-18-2001 14:01:39




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 Re: Re: JD50 fuel shutoff, manual vs. oil pressure?? in reply to Phil, 12-18-2001 12:01:37  
I understand that a bad oil pressure fuel valve can leak gas back into the oil pressure line. The best I can tell advantages for oil pressure units is that you don't have to remember to turn the gas off. Other than that, it is kind of up to what you prefer.



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