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Allis Chalmers G stalling

L

LBFarm

New User
Hi, my G will be plugging right along when after about 15-20 minutes it starts surging and stalls. It doesn't appear to matter what gear it's in or how high or low the throttle is. I've checked the fuel line, running fine, filter's good. The governor appears to be acting up when this happens- jerky motion matching the surges of the engine. I thought adding a surge spring would help but I know it's not TECHNICALLY designed to have one. Anyone else encounter this and have a solution. I'm a rookie so pictures would be helpful. Thanks!

J
 
It sounds like you have a fuel problem. It could be a floating object in the tank all the way down to something very small moving around in the carburetor. I had a tractor that would die after a sharp right turn to the right when mowing hay. Start right back up until the next sharp turn to the right. Drove me nuts for a half day not getting the hay down for hunting the problem. I found a 5/8" flat washer in the tank. Apparently when the tractor would jerk to a stop the washer would slide off the outlet and slide back when I would turn as the outlet is on the left side of the tank. I have had a problem with a sediment bowl assembly with restrictions in the neck as well as in the shut off needle where the needle has to be removed to find it. I blow compressed air in the gas line at the carburetor back thru the tank first to see if that clears the problem first. Then look in the tank to see if the gas is cloudy from rust particles. If the gas is clean then clean the carburetor. Keep looking and you will find the problem.
 
If it makes you feel better, I'm fighting a similar problem. My "G" runs rough, almost stalls out, like it's not getting fuel, but does this only when thoroughly warmed up going up even a modest hill when in road gear. I have had no other way to load the engine up until installing a belt pulley recently. Now I can load it up while it's standing still, but I can't repeat the problem. Maybe I don't have enough load on it. Aren't old tractors fun?
 
I think I may have found my problem. Some years ago I put a layer of RedKote in the fuel tank. Now looking in the tank I see shiny steel, no RedKote, at the bottom of the tank - in that area where the fuel will not drain out! BTW, I have NEVER used fuel with alcohol in it. I'm now wondering about the best way to remedy that. Maybe just re-coat and then in some way try to remove ALL gas when the tractor is stored for longer periods?
 

I had the same problem with one of my G's. After making sure fuel was flowing, and the governor run was fine (may have been unnecessary) I started looking at the carburetor. Took it apart and found no problem. Nothing was stuck, it was clean because it was serviced last year. What I did come up with is there are two (maybe more) types of carburetor for this tractor, both are Marvel Schebler TSV-13. One does not have a mix setting down below. I replaced with one that does have that adjustment and its been purring ever since.

To be fair, the old carb was rebuilt with the "economy" kit last year. Perhaps there was another reason it failed, I don't know. Just thought I'd add this to the mix out there.

Adam
 
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