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Discussion Starter · #1 ·
Tractor was parked 10 yrs ago because it would quit running when hot. I soaked the carb, blew it all out. I don’t have the drill bits but blowing air threw the passages isn’t stopped up. I put a new kit in it, everything but a float. I put new points, condenser, autolite 3116 plugs and new wires on it. Tractor starts and runs great half the time. The other half it runs good until it starts to get warm then it starts backfiring threw the exhaust and won’t hardly run. Every time it won’t run the carb is frosted over and the intake all the way to the head. Obviously I know it’s vapor locking but why? I’ve took the carb back off gutted it and cleaned it again, tried diff plugs. I’m about at a loss on why it only does it sometimes and what’s causing it, anyone have any ideas? Only thing I haven’t done is try higher octane gas which I’m going to. Thanks
 

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55JD50 57JD420C 57JD420U 55JD40W 66JD110 73JD140H3 2006JDGX335 44JDBO 45JDBR 85JD750
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Tractor was parked 10 yrs ago because it would quit running when hot. I soaked the carb, blew it all out. I don’t have the drill bits but blowing air threw the passages isn’t stopped up. I put a new kit in it, everything but a float. I put new points, condenser, autolite 3116 plugs and new wires on it. Tractor starts and runs great half the time. The other half it runs good until it starts to get warm then it starts backfiring threw the exhaust and won’t hardly run. Every time it won’t run the carb is frosted over and the intake all the way to the head. Obviously I know it’s vapor locking but why? I’ve took the carb back off gutted it and cleaned it again, tried diff plugs. I’m about at a loss on why it only does it sometimes and what’s causing it, anyone have any ideas? Only thing I haven’t done is try higher octane gas which I’m going to. Thanks
My guess would have to be the frosted up intake. On my 50, there is a manifold heat control valve. It allows heat from the exhaust to warm the intake air. I don't know if it was provided on the model A, but that's where I would start looking.
 

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Deere did have a cold weather gas manifold, were the exhaust channel runs over or under the intake channel rather than behind it like we are used to. But no heat exchanger valve like the numbered series. I am wondering what is blocking the intake path pre carb to put the system under that much vacuum to frost the carb and manifold. Maybe dissassemble the air cleaner and soak the wire mesh air cleaner then wash out. Or for a quick test turn the 2 bolt pipe from air cleaner to carb upside down and put a paper element on like the pullers do and see if problem happens that way.
 

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You probably already know this, but mud dobbers love to pack the intake stack full of their mud. We had removed the entire air filter assembly and pressure washed it until the river of mud stopped coming out. The sheet metal stack was so rusted and full of holes that we cut it off to put on a new replacement. The thing was still clogged with that mud. This was all done before the engine was ready to run, so I don't know if it would have caused icing of the manifold. It probably would not have been able to start.
This was a '50 B that had sat for 20 years in a barn. We put an old cotton sock over the pipe when it sits in the garage for months at a time.

tommyhawk
 

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Discussion Starter · #10 ·
I pulled the elbow off and let it run, 4-5 min maybe at the most and the same thing , I think maybe it runs worse without it. I dunno it beats anything I’ve seen. I really don’t know what else to try. Any ideas?
 

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Could you possible post a video on here or YouTube and then post a link so we can see what it is doing first hand? May be helpful with diagnosis and or bring more ideas to the table.
 

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Discussion Starter · #13 ·
Well it’s been a while since I’ve been on here, the A got pushed to the side and put off. One day last week I was going on service calls driving and out of know where got to thinking about the tractor and remembered I had put those autolite plugs in it, and yrs ago when I was a kid I remember it being finicky about what plugs you put in it. So over the weekend I pulled the plugs out and stuck 2 champions back in it, fired it up and boom. No more frosty carb. It runs great. Not sure about any other A’s, but this one don’t like autolites. All of that trouble all for a couple of lousy plugs.
 
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