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Re: FARMALL 460 Stalling Issue

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pete 23

01-23-2013 10:24:24

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The heat riser will normally stay in heat on position, counter weight straight up and down, until very well warmed up and then and only then will it move forward if it has a good spring. In other words, like pulling a plow it will lay down. Yard work, probably stay in up right position all day long. Who knows what condition that valve inside is. May be half burned off so it is not directing heat to the stove. That is why I always take those manifolds apart when I have the head off. Flat raters won't mess with all that extra grief and work. It may have never been apart in it's life. Like I said, if you had it on a dyno and it actually worked well under load, then you could say with some certaincy carb is ok and cold puttering around work would be manifold problem. Remember, an engine never really warms up without a load. I could go on all day about those sputtering 460's. We had a customer, fairly new tractor, maybe 7 or 8 years old. He even put on a new intake manifold to over come the coughing. Then him and another customer traded tractors. Other one was diesel. They both wanted to keep their own power train so they had me do a mid section, cross switch. So, fuel tanks etc stayed with original tractor. When the guy who had the diesel came in and picked up the gas to take it home, we were on lunch break. He starts it and proceeds to take off, cough, cough, kills it, we just laughed. Welcome to a 460 gas.

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01-26-2013 17:05:22

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 Re: FARMALL 460 Stalling Issue in reply to pete 23, 01-23-2013 10:24:24  
Just an update on things with the 460. I had the carb off one more time. This time I cleaned it and ran a wire through all of the passages, and I visually inspected everthing and there are definitely NO blockages in there. I set the float level to 1 5/16" (it was just about there anyway), and set the main jet to 5 turns out. I also drained the gas tank, removed the sediment bowl and gas line. The sediment bowl and filter screen in the top of it were very clean. The screen that goes into the carb. was spotless. I purchased and put in premium grade gasoline (93 Octaine I think) and I put an extra turn on the manifold heater spring. I couldn't think of anything else to do, so I turned on the gas and fired it up and guess what? It's exactly the same as it was before......stalls under load or if you gun the throttle. I did notice with the manifold heater flap staying closed a lot longer, that when I gun the throttle (by pulling the choke partially out) the external counterbalance weight moves as if exhaust gases are pushing on it from the inside. I think that would indicate the flap is definitely still there.
My conclusion is.....there has to be something wrong with the carb. I don't see any signs of modifications or alterations inside of it, but who knows what might have been done to it or swapped out of it over the years. I'm going to replace it with another carburetor. That way I'll know for sure. I don't see any other options right now.

I'll let you all know how it turns out....good or bad.

Thanks for all of the suggestions and advice.


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02-13-2013 13:33:08

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 Re: FARMALL 460 Stalling Issue in reply to RJG, 01-26-2013 17:05:22  
Wanted to give you all an udate on my 460's condition. Finally figured out what the issue was with my stalling tractor and it was indeed the carburator. As it turns out somewhere in this tractors past someone decided to modifiy and improve the carburator design. They removed the smaller inner section of the venturi. I didn't see or notice it because they apparently went to great lengths to file and polish the inside wall of the venturi passage way smooth, leaving no trace of the removed center section.

Sure had me fooled......but now with the new venturi installed it works like a champ....almost.

Another question for all of you experts. The governor isn't working correctly. If I gun the throttle, the motor doesn't keeps varying the speed up and down, and up and down, for quite a while. I've had the governor off and cleaned it up. There's not much to it. The bearings look pretty good, and there's not a lot of slop in any of the moving internal parts. It appears that everything inside is moving freely and doing what it's supposed to do.
I'm wondering if the external spring could be the culprit? It looks good and doesn't seem to be fatigued, but I've ordered one to replace it just in case.
What do you all think about the governor?



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