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John Deere Tractors Discussion Forum
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Fuel in Crankcase - John Deere 50

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12-07-2004 18:43:52

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I have a 1952 John Deere Model 50 that is getting fuel in the crankcase. I read in Green Magazine (Mr. Thinker) a few years ago, how to correct the problem but have not been able to locate it. Can someone refresh my memory on what to repair?

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John Van Valkenburgh

12-09-2004 04:49:13

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 Re: Fuel in Crankcase - John Deere 50 in reply to GLCK40, 12-07-2004 18:43:52  
A '52 model 50? You've got one of the early ones! You already got good advice on the likely problem, the only thing I would add is that I manually shut off the fuel at the seperator bowl at the end of the day. Just a little extra insurance that the gas stays in the tank in case the carb needle/seat develop a leak.

Enjoy you tractor, the 50 is a great little machine.

1953 Model 50

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12-07-2004 22:24:04

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 Re: Fuel in Crankcase - John Deere 50 in reply to GLCK40, 12-07-2004 18:43:52  
Thanks to both of you for the information. I took the carburetor off yesterday to have it rebuilt and will check the diaphram next. Appreciate the prompt answers.

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12-07-2004 22:26:29

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 Re: Fuel in Crankcase - John Deere 50 in reply to GLCK40, 12-07-2004 22:24:04  
Thanks to all of you.

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12-07-2004 22:22:48

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 Re: Fuel in Crankcase - John Deere 50 in reply to GLCK40, 12-07-2004 18:43:52  
The early 1953 model 50's made in 1952 did not come from the factory with the oil pressure gas shutoff system. So we first have to find out if this tractor has had one installed in the field. If it does not then gas is probably getting into the oil through the carburetor. The needle and seat must be leaking. Does the tractor have a manual fuel shut off?

You can get the bowl off the carburetor w/o removing the carburetor off of the tractor. Check whether the needle and seat is truly stopping the fuel when in it upward most position. Also check to see if by chance the float might have some fluid inside the float.

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John T

12-07-2004 19:14:49

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 Re: Fuel in Crankcase - John Deere 50 in reply to GLCK40, 12-07-2004 18:43:52  
GLC, in line with what Frank was referrign to regarding a leaky diaphram in the auto shut off sediement bowl assembly (if you have one) OIL ONLY AND NOT GAS should be in those lil oil lines and the T fitting where the oil line goes up to your oil pressure gauge. If any gas is present or leaking out there, thats a source of it gettign into the oil. If you remove one of the fititngs engine not running theres no oil pressure present, so if gas leaks out there, you need to replace the thin rubber diaphrams in that shut off assembly, via the repair kit available from Mother Deere. Do you have the auto shut off sediemt bowl assembly or not??? if none, then I agree with Frank the carbs needle valve n seat and float assembly may be bad and gas is overfilling the bowl and getting into the emngine that route.

John T

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12-07-2004 19:03:12

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 Re: Fuel in Crankcase - John Deere 50 in reply to GLCK40, 12-07-2004 18:43:52  
If you have the oil pressure fuel shut-off, it could be leaking through a torn diaphraghm, down the oil pressure supply line and into the crankcase. Or you have a leaky float needle and seat, which could cause it to be spilling out of the bowl and into the carburetor throat. That might show up as dampness around the bowl gasket, but if it's sealed well, it might be difficult to see.

I think those two areas are the likely culprits.


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