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Farmall 460 spark plug stock number

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i love tractor

New User
Does any one know what the stock size for a farmall 460 spark plug size is. We pulled d21 out of it, but they are saying we should run d18 up at the local tractor implement. Which number should we put in?
thanks guys
 
A D21 would be a HOTTER plug, PERFECT for keeping the plugs cleaner on today's gas, especially if it burns a litle oil, and you are not pulling it HARD in hot weather.
 
I looked at the old spark plug I have laying up at the house from my Farmall 460 Gas and it is labeled C15. A quick check at the Champion spark plug website says C15 is no longer made and lists D21 as the replacement. That is what are in mine now. The only strange thing is the Champion website lists the plug as a 18mm thread. I can't imagine a 1959 farmall having a metric thread; Kind of odd.
 
The original spark plugs were either D16 or D15Y. International started with the D16's and then changed to one heat range colder with extended tip. That is the D15Y. For light duty the recommended plug was a D18Y, still extended center electrode but a few heat ranges hotter. With the phasing out of leaded fuel the recommended standard duty plug became the D18Y and D21 for light duty.

For tractors still being used at full load most of the time the D15Y will still work. For moderate usage a D18Y should be used. For light duty use, or if you are having fouling problems with D18Y plugs, use D21 plugs. Do not use D21's if you are going to doing something like plowing of disking where the engine will be running under for load for an extended period of time. They will start to run too hot and can lead to engine damage due to preignition.

The threads for spark plugs were changed to metric sometime in the twenties or early thirties. 14mm is the most common but Ford used 18mm for quite a few engines and I've seen some old GMs from the thirties and early forties that used 10mm threads.
 
NOTHING odd about that. Sparkplugs have had metric threads since they phased out the pipe-threaded ones after the 1920's!
 
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