Posted by T.R.K. on May 31, 2022 at 19:03:24 from (173.185.105.200):
In Reply to: Farmall m backfire posted by Noah Washine on May 30, 2022 at 19:16:21:
The others have good ideas.
It is sounding like you are getting fire into the intake manifold while a valve is still open.
What type ignition is on your M? If you have converted to electronic ignition, they can screw up their timing sometimes.
The first thing I would check is the rotor button still turning? Years ago I had one do that on another make tractor and the fiber gear in the magneto has stripped out and was loose on its shaft. So it might be a good idea to see if you can actually turn the rotor button on the shaft (In a distribuitor you should be able to turn it a few degrees because of the mechanical advance, but it shouldn't just be turning freely in there.)
If I prove that to not be the case then I would check the valves. Also, if a valve or valve seat suddenly becomes damaged it can do that same thing too. I had one once with water damage from sitting and a few minutes into running a piece out of one of the valve seats.
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Today's Featured Article - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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