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The auction M part 8 not quite right. What do we do?

1

1939farmall

Member
I was able to run the M around a little today.
cvphoto102370.jpg

It starts good, the engine has good oil pressure, and its charging. The brakes on the other hand will still need some work. I dont think we cleaned them up as good as we should have.
cvphoto102371.jpg

We could use some advice on what I am thinking is a governor problem. You can see in the first picture our driveway goes up hill. I noticed that the tractor really bogs down under any kind of load. I put it in 4th gear and drove up the driveway and it feels like the governor is surging. The tractor acts like it is really under a load, then you can hear the rpm increase and it pulls like it should. Then it bogs down again. Back and forth. Ive never had to work on a governor so Im not sure what to look for. I havent read the manual yet or removed the cover plate, too many other things to get done today! What do you think? Governor problem or something else Im not thinking of? Thanks for you thoughts and advice. This last picture is our 1939 M parked next to the auction M. I think they make a good pair! Thanks again.
cvphoto102373.jpg
 
Could be a weak spring & worn linkages in the governor. Are you sure that the linkage between the governor and the carb isn't binding anywhere? Is that linkage shaft's square end in the carb correctly? I would check that linkage first.
 
Could be. We just rebuilt it and added a new fuel line and new sediment bowl. Gas tank is pretty clean. It could have sucked some junk in that we missed in the tank.
 
90% of what appears to be governor is fuel delivery. Was the screen at the carb fuel fitting cleaned? Open the carb drain plug in the bottom with a can under it. It should flow a gush, then a nice steady stream to do a pint a minute or more. If it slows to beads and drips, there is a restriction. Jim
 
We had everything clean but I cant say we couldnt have missed something or sucked some junk in. It would be easy enough to pull the carb and go through it again. Thanks.
 
A pint a minute is a little higher flow than an M will need, that rate is 7.5 gallons per hour. A pint in two minutes or slightly less will be fine. The M full load test data shows it to use 2.8 gallon an hour. To make a quick check for linkage bind between the governor and carb take the angled cover with the vent tube off on top governor and check freeness with the engine off and throttle set at idle.
 
Easy check of the governor, engine off, dash lever set to idle, the throttle plate should be closed against the idle stop screw. Push the dash lever to fast, the throttle plate should be spring loaded to wide open.

Start the engine, quickly move the dash lever to fast, the throttle should go to wide open, then modulate back to near closed as the RPM comes up. If the RPM fails to respond, the throttle plate will open accordingly. All the governor is concerned with is controlling the engine speed. Surging and hunting are almost always fuel related, sometimes ignition related.

If the governor checks out, check the points gap, check the distributor shaft for side play.

Check the fuel flow through the carb at the drain plug.
 
This is a good check list to work down. Sounds like I need to take a second look at the carburetor. I was taking for granted it should be fine since we just had it apart. But we may have missed something or sucked some junk in. I think we will still check the governor its the about the only thing we havent looked at. Id like to understand its function better and know its working right. Thanks for the help.
 
Hold the linkage still while it's running to prevent movement of the carburator butterfly. If it runs smooth, then it's probably the governor. If it surges & fades.......the it points to the carb.
 
Lack of power , I suggest first if its surging the Governor is trying compensate for lack of fuel .Id clean the fuel delivery. Lines Clean them out. Sediment bowl screen replacement . Sediment bowl input hole needs small drill to clean out that fuel white crust from new fuels. The srcrren to in put the carburetor needs cleaned or replaced . Lastly the carburetor need the idle circuit cleaned out with who know whats in there from aged fuel.
 
It does sound like a fuel problem bad enough that the governor can not compensate for it. If the second M runs good, try putting that carburetor on the poor running tractor.

Also check the ignition timing, dwell and centrifugal advance. Consider swapping distributors there too, distributor shaft bushings could be worn oversize or advance mechanism could be sticking.
 
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