Spark plug ?

marmon77 · Jul 26, 2015

I needed spark plugs for my Ford 850 tractor, I forgot the plug when I went into town so had to cross reference to what they had. I ended up getting an Autolite 2635. While putting in the last plug I checked it against the old one and noticed that the Autolite was about 1/4" longer than the old plug. I finished putting them in and started the tractor up and it ran. I didn't hear any tapping or unusual noise so I shut the tractor off and pulled one of the plugs and it looked fine, wasn't collapsed like the piston hit it. My question is should I replace with the shorter plug or will the Autolite's be fine?

Larry NCKS · Jul 26, 2015

Don't know the heat range of that plug. The correct Autolite # is 437. There is likely more difference in those plugs than just the length. The long term performance may or may not be there in the 2635.

souNdguy · Jul 27, 2015

In addition to what's been said, if the threaded portion is too long and carbons up.. it makes it hard to remove from the head.

champion h12 ( 512 ) H10 the mentioned 437's ( 216 ) etc.

lots of correct parts out there.

souNdguy · Jul 27, 2015

your Autolite 2635 plug is 2 heat ranges colder than the oem H10 and 3 ranges colder than what most of us run...

Redhunter2486 · Jul 27, 2015

My Ford came home with the wrong plugs in it , id have to clean them every 15-20 hrs of use or they'd foul up too much, when they were clean or "new" it ran fine. Ive been running the ngk brand, its worth a couple bucks to me to know the plug is never the problem!

Spark plug ?

marmon77

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Larry NCKS

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souNdguy

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souNdguy

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Redhunter2486

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