Farmall65

Member
Whenever my M runs for a little bit, it goes to popping. It isnt super severe but Id like to diagnose the problem. Heres what i have done so far.. Pulled valve cover and adjusted the valves, new plugs and wires, rebuilt the carb along with cleaned the fuel line, tried adjusting the timing but didnt help much. When it starts up it runs perfect its just once the engine gets heated up, it goes to popping. Only thing I can come up with is maybe it is getting too much fuel and exploding in the cylinder?? Tanner
 
spent all that money but didnt take a compression check thats the first step as all those parts didnt go bad all at the same time.
 
In my opinion it is normal. All Farmalls I have been around do it. if it is happening at any speed under no load, you are hearing noise that is the result of the engine design and short exhaust. If there is no performance issue, you are hearing (and seeing if the weather cap bounces) the compromise combustion chamber design, the fuel delivery designed in the 1930s, and lack of computer control. Jim
 
It's too bad someone didn't make some flat top pistons with the same compression as the fire craters,would of been a win win situation,to work with the gasoline head.
 
I have two SC's. One with magneto and one with distributor. The magneto tractor will make the "poping" sound. The distributor tractor doesn't. The difference is the advance in the distributor.
 
It does have a magneto and not a distributor.Is this normal for it to pop, as I have heard it is common for these old tractors do so oppossed to a having distributor?
 
(quoted from post at 22:30:40 05/25/16) It does have a magneto and not a distributor.Is this normal for it to pop, as I have heard it is common for these old tractors do so oppossed to a having distributor?

I grew up being around those old Farmalls. Some still had the original magneto, and some had been converted to the battery ignition distributor. They all ran smooth as a sewing machine.
 

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