Farmall M (carburetors)

Brent Zappe · Dec 12, 2010

I have this 1951 Farmall M that I had restored. When I ordered a gasoline carburetor for this tractor it came to me as Kerosine carburetor. I found a person in town who could change it to a gasoline carburetor. My question is what is a difference between the two types. My problem is starting up the tractor. I have to prime the tractor while cranking it over and it might start if not the gasoline flows back down draining to the ground. The spark plus are dry not flooded or wet. Yes I do have a magneto ignition not a distributor ignition. Could it be I need a gasoline carburetor.Does any body have a suggestion that I can try. Thank you Brent

gene bender · Dec 13, 2010

Sounds like your guy messed up a good carb. If your is the original dual fuel carb just how did it start on gas then switch to fuel when warm with the same carb . Point there is no changing of the carb to gasolene. Get your 'friend' to get your carb so it will run as he screwed it up so he should fix it back.

D Slater · Dec 13, 2010

Some jets and passages were a different size, but if both carburetors are in the correct shape it would have little to no effect on starting.
Unless sure it the carburetor, may want to rule out intake leaks, inproper valve adjustment, make sure ignition system is timed and working properly. When you say fuel type was changed on the carburetor it does sound suspicious unless they know the carburetors and have a parts supply.

glennster · Dec 13, 2010

my 42 m is a distillate, and still has the distillate carb on it. the head is a later higher compression gas head, but the tractor starts, runs and drives fine. sounds like there is a passage plugged up in the carb.

rustyfarmall · Dec 13, 2010

(quoted from post at 21:39:32 12/12/10) I have this 1951 Farmall M that I had restored. When I ordered a gasoline carburetor for this tractor it came to me as Kerosine carburetor. I found a person in town who could change it to a gasoline carburetor. My question is what is a difference between the two types. My problem is starting up the tractor. I have to prime the tractor while cranking it over and it might start if not the gasoline flows back down draining to the ground. The spark plus are dry not flooded or wet. Yes I do have a magneto ignition not a distributor ignition. Could it be I need a gasoline carburetor.Does any body have a suggestion that I can try. Thank you Brent

Find someone who will be honest with you, and hopefully someone who DOES know something about these carburetors. 50 to 60 years ago there may have been a difference between the kerosene/distillate carburetors and the gasoline carburetors, but that is not true today, and a carburetor that ONCE was intended for kerosene has most likely already been rebuilt using internal parts for a gasoline carb. Anyone who tells you different is only trying to get into your pockets. Chances are, that rebuilt carburetor you bought, and it WAS rebuilt, would have been just fine as it was, and should have been left alone.

Shepherd Bill · Dec 13, 2010

(quoted from post at 21:39:32 12/12/10) IMy problem is starting up the tractor. I have to prime the tractor while cranking it over and it might start if not the gasoline flows back down draining to the ground. The spark plus are dry not flooded or wet. Yes I do have a magneto ignition not a distributor ignition.

I've had the same problem as you describe. It isn't a fuel difference carb but another problem. Dirt in a jet, sticking needle valve or ??? I don't really know and I hope someone will address the excess fuel draining while the spark plugs are dry. We finally solved the problem but I'm not sure of what worked. Cleaning the carb, being sure the govenor was connected right to the carb and some other messing around.

rustyfarmall · Dec 13, 2010

(quoted from post at 08:04:14 12/13/10)

(quoted from post at 21:39:32 12/12/10) IMy problem is starting up the tractor. I have to prime the tractor while cranking it over and it might start if not the gasoline flows back down draining to the ground. The spark plus are dry not flooded or wet. Yes I do have a magneto ignition not a distributor ignition.

Click to expand...

I've had the same problem as you describe. It isn't a fuel difference carb but another problem. Dirt in a jet, sticking needle valve or ??? I don't really know and I hope someone will address the excess fuel draining while the spark plugs are dry. We finally solved the problem but I'm not sure of what worked. Cleaning the carb, being sure the govenor was connected right to the carb and some other messing around.

Make sure the float valve and seat are nice and clean, the seat is screwed down tight against a GOOD gasket, make sure the float does not have a pinhole in it and that it is adjusted according to specs for both the height and drop. (no fudging) Also, make double sure that the float is not rubbing or dragging on the sides of the fuel bowl. A carburetor is a PRECISION instrument. Treat it as such and you will be rewarded.

Farmall M (carburetors)

Brent Zappe

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gene bender

Well-known Member

D Slater

Well-known Member

glennster

Well-known Member

rustyfarmall

Well-known Member

Shepherd Bill

Member

rustyfarmall

Well-known Member

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