Sparkplugs for a farmall M

Brent Zappe · May 23, 2014

I started to realise today that I had a stack of spark plugs on my bench. I got myself confused when I started to read the Autolite spark plug numbers. I think the Autolite 3116 go for the farmall M. I think the Autolite 388 go to the case 440. Then I looked and there where Autolite 386 now what they fit well who knows. Question has came to my mind what Autolite fits the Allis Chalmers model B?

David G · May 23, 2014

386 will work fine in M with distributor.

glennster · May 23, 2014

386 and 3116 are the same heat range, and will both work, the 3116 is for a magneto ignition, but will work on a distributor. the 388 and 3118 are also similiar, but a litte hotter heat range than the 386/16 plugs.

John T · May 23, 2014

The 388 is just a tad hotter then the 386, both of which are Resistor Plugs. The 3116 is somewhere in the mid point of the 386 and 388 heat ranges I believe, HOWEVER its a NON Resistor Plug which would be best if it had a Magneto Ignition but would still work fine in a battery powered coil distributor ignition.

Your money your tractor your choice. We report, you decide.

John T

Brent Zappe · May 23, 2014

Hey thank you I could use a little bit of being organize. I will go out there and mark those boxs of plugs.

Sparkplugs for a farmall M

Brent Zappe

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David G

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glennster

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John T

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Brent Zappe

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