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End My Confusion

A

Anonymous-0

Well-known Member
I have recently inhereted a 1949 Farmall M Tractor that is not running. Right now I just want to get it in running condition and thought I would rebuild the carb and give it a tune up (points, wires, cap, etc) My confusion comes from looking up these parts.
There are several different carb options depending on OEM num and throttle body num. How do I find these numbers? Right now the carb is so filthy I cant find any numbers so can you tell by the trators year?
Same problem with Ignition there are a lot of options. I think it has a magneto but how do I know if its a WICO, Delco, or IH distributer??

Thanks for any help.
 
If it is a mag in my experience the distributor cap will be mounted horizontally, pointing toward the rear of the tractor. That is an IH H4 mag. Distributors that use battery voltage usually are vertical, pointing up, in my experience. I don't know how to tell the make on them.
Zach
 
The carb will possibly need to be removed and cleaned up to identify. With luck, there'll be a cheap metal tag with an ID# on it, usually held on by one of the screws holding the bowl to the body. If that's not there, there's usually someting in the castings that will help you identify it.

As far as the ignition. It will either be a magneto or a battery ignition.

A WICO mag would have had to be a replacement. The M came with the H4 mag. guts of them were fdifferent to allow for different igntion timing, but the same maf body was used on all the letter series (the Cub was a J4). Easily identified by a rectangular black resin cap on top, from which runs the coil wire to the center of the distributor cap.

Battery ignitions . . . the standard IH distributor was laid out horizontally, with the ignition coil obvious nearby. I'm prepared to be shot down on it, but I believe the Delco distributors available for the M were all oriented vertically.
 
Just for clarity, and with respect: The IH ignition (standard Points and coil) are all horizontal and rear pointing. Somewhere after WW2 the distributor was considered standard production, and mags were an option.
(all horizontal and just like the ones on tractors up to the 450. (internal changes for timing curves were the only difference) The Delco distributors were replacements for mags. IHC (and many tractor mags of that era) do not have centrifugal advance. This lack of advance meant, and still means, that when running they are at full advance, even at idle.
A proper curve of advance makes for a much smoother running tractor, and improves economy.
Thus the changing to a Delco when either the mag went bad, or to improve the tractor"s performance.
Jim
 
If its a mag, and an IH mag, itll have the IHC emblem on the top cap. There is no tag on the bowl bolts, just a round brass tag on the upper half of the carb, but I dont think I have ever bought a kit where it mattered!
 
There are only two carb options, distillate/kerosene, and gasoline. Does the serial tag have an X1 suffix? If so there is only one carb for it, the gasoline one. The other is the distillate/kerosene carb, most of the parts are the same. If you don't have a parts manual, look at the parts section in www.caseih.com. The year does not matter. For the M the choke lever is on the outside, for later models it is on the inside, next to the block. It is possible, but not too likely that the carb has been changed -- in that case you need to look for the numbers.
 
Thanks very much for setting me straight. I have seen two or three M distributors that went up and assumed that they were all like that. I didn't know that IH made horizontal ones too. I should have considered what a statistically insignificant sample I have seen. I am grateful that you are here to explain things for us all.
Zach
 
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