Farmall M

[Bryan Carroll]

Thanks guys i will try your suggestions & follow up. I knew i could count on all of you.

 

[mkirsch]

Bryan, no need to start new threads every time you want to add something. Just reply to the existing thread. It makes it much easier to follow.

 

[FBH44]

I got in late on this topic, but here's some info about heat ranges on Autolite plugs. If you can follow this disjointed thing....
Farmall Spark Plug Heat Range

2014 Autolite Spark Plug catalog
Heat Range Chart page 4-5

18MM thread size
1/2” reach
7/8” hex
HOT rating
 388 Standard resistor plug
 3116 ‘Power-Tip’ Non-Resistor plug
 386 Standard resistor plug
• [gap]
• [gap]
 373 Standard Non-Resistor plug
COLD rating

Each step up equals a 70º – 120º increase in spark plug tip temperature.
Self-cleaning zone is 500°C to 850°C tip temperature.
IF TOO HOT = Possible severe engine damage, pre-ignition, detonation with
racing / high performance engines. .
IF TOO COLD = Possible fouling, possible mis-firing, but no engine damage.


Cross-Reference Chart from Autolite.com
Champion …. Autolite
D10 . . . . . . . . . . . . . . . .373
D14 . . . . . . . . . . . . . . . .386
D14N . . . . . . . . . . . . . . .373
D15Y . . . . . . . . . . . . . .3116
D16 . . . . . . . . . . . . . . . .386
D16J . . . . . . . . . . . . . . .386
D18Y . . . . . . . . . . . . . .3116
D21 . . . . . . . . . . . . . . . .386
D23 . . . . . . . . . . . . . . . .388
D6 . . . . . . . . . . . . . . . . .373
D77V . . . . . . . . . . . . . . .373
D9 . . . . . . . . . . . . . . . . .373