Farmall M actually runs, couple questions now

michaelr

Member
Ok,

After tinkering(replacing lots of parts) on the most cobbled up disaster of somebodys personal welding project(there is not a single thing on there that has not been welded). hey, it just has to pull a mower and lift crap with its #33 bucket. I got the engine started a couple days ago. so yay. Note, the POS china starter on there was one thing I did not replace, until I was all prepped to start it, and it would not spin worth a $hit. So I pulled an original delco starter off an M in a junkyard and bolted it on, and VROOOM! I think every post could say something about china parts being absolutely worthless(and dangerous). Anyhoo. So the engine runs. I noticed that the manifold uptake pipe ontop of the carburetor was sweatingcold. Is that normal? Like the bottom 3 inches or so, it was cold and condensating. The thing has amazing throttle response though, you pull back and it does not hesitate or miss a beat. Have an idle question though. I am fearful of idling it too low, cause that would be bad for the oil pressure, yes? Or on the Farmalls can you idle them way down safely? ALso, to stop it, I just turned the fuel off and let it run for another minute or less til it ran out of fuel. I don't like leaving gas in the carb, and that will eventually make the float stick. Do other people do that as matter of best practice when parking it for a few weeks?
 
Google "venturi effect." That will explain why the intake gets cold. It is normal.

There is no issue with idling the tractor as low as it will reliably idle. If the oil pressure is so low that it goes to 0 when you idle the engine, it has far more serious problems, and needs some work. Suffice it to say you will not get much useful life out of the engine in that condition.

The way you're shutting it off is fine. Many people do it that way. I don't, and have never had a problem, even leaving the tractor sit for months at a time between startups.
 
As good atomizes it causes the gas to get real cool and can even get so cold that you can have frost on the manifold and top area of the carb and yes that is just part of the way things work. That is why on many of the cars and trucks there was a tube going form the exhaust manifold to the carb intake so as to feed warmer air in so that the carb was less likely to ice up
 
They can be idled to incredibly low speeds with no problems. With 15-40 oil in them they will be fine. The only issue is that it will not be charging unless it has an alternator instead of a generator. Jim
 
Nah. My tractors sit for a month or two at times, or even over the winter, and I never bother to empty the carbs. I've never had a problem that I could attribute to leaving gas in the carb.
 

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