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Antique Tractors - Old Iron Lugs, Cleats and Tracks

John Deere A fuel in crankcase


as maybe some of you know i am not much of a JD man--a recent purchase/trade left me with a couple...

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Old 12-20-2010, 05:55 PM
Ihorse Ihorse is offline
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Photo John Deere A fuel in crankcase

as maybe some of you know i am not much of a JD man--a recent purchase/trade left me with a couple JDtractors--one 1940 A and a 1937 GP both row crop, the A is totally original, my question for you, when i got them the A had a bunch of fuel in the crankcase, i checked the float, seemed ok?--i drained out the bad fuel/oil, and added new--put some fuel in it , and about three days later , no fuel in the gas tank, but all had migrated to crankcase again----help me out here----something in carb ??
thanks
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Old 12-20-2010, 06:14 PM
Buck Hoffman Buck Hoffman is offline
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Default Re: John Deere A fuel in crankcase

Sounds like a carburetor problem, Are you shutting the fuel off when you leave it?
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Old 12-20-2010, 06:38 PM
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Ken Majeski Ken Majeski is offline
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Default Re: John Deere A fuel in crankcase

If the Needle and seat don't seat Absolutely Perfectly that will happen.... And the John Deere fuel shutoff is sometimes worn so it leaks by some too...

Some will leave the carb drain open and put a can under it.

I'm afraid the only permanent solution is to Replace or rebuild the fuel shutoff and needle and seat.

What I did was to replace the fuel shutoff with a Modern valve that works but thats not for the Purist...
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Old 12-20-2010, 07:24 PM
AultmanTaylor AultmanTaylor is offline
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Default Re: John Deere A fuel in crankcase

The float probably isn't a 100%, or the needle on top of the float.
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Old 12-20-2010, 07:43 PM
Ihorse Ihorse is offline
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Default Re: John Deere A fuel in crankcase

i did notice that the fuel does not completely shut off--[close tho]--i left the fuel line off the carb for a while, it continued to drip a bit, with the shut off closed--i suppose over a while it would get a bunch in crankcase, but it has to go by the carb somehow-- seating problem i seems like--
thanks again
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Old 12-24-2010, 02:23 PM
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Jon Nessel Jon Nessel is offline
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Default Re: John Deere A fuel in crankcase

What I did was to replace the fuel shutoff with a Modern valve that works but thats not for the Purist... [/QUOTE]

I did the same on my AR. I bought a brass valve with a 1/4" male npt thread and threaded it right into the carb, then attached the fuel line to it. Unless you're really looking, it looks all original. I've had that same thing happen to me and it's not fun when the cylinders get filled and you try to start it.
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Old 12-24-2010, 04:52 PM
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Craig A Craig A is offline
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Default Re: John Deere A fuel in crankcase

Always, ALWAYS, ALWAYS shut off off the gas.

My Dad drilled that into me and it stuck.
Don't leave the clutch engaged either.......
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Old 12-24-2010, 08:44 PM
Mike McKnight Mike McKnight is offline
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Default Re: John Deere A fuel in crankcase

I REALLY like the looks of that '40-dad's first tractor (and mine now) was a '39 A with cut-offs on the back and solid rims on the front....just like that one!

Mike M
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