spark plug question

billmart · Dec 24, 2013

I just found a set of (6) N.O.S. AC 18A spark plugs. Pictures are a little fuzzy but what's with the funky electrode? Someone told me they might be for a early Farmall diesel tractor. Anyone seen plugs like this before? thanks, Bill

rustred · Dec 24, 2013

the gas start diesel's do have an extended reach plug. just from the picture the thread type looks too small.

Bob · Dec 24, 2013

From the MD parts catalog...

Do you suppose the "U" ground electrode was an idea to keep it from breaking off in use due to vibration from the engine in diesel mode?

262456R91 SPARK PLUG SPARK PLUG WITH GASKET, 37762H (Champion 49) (Optional with 50309DC or 258938R93) (Will work for 50307DD)

50309DC SPARK PLUG WITH GASKET, 37762H (AC 18A) (Optional with 262456R91 or 258938R93)

258938R93 SPARK PLUG WITH GASKET, 37762H (Auto-Lite BT-15) (Optional with 262456R91 or 50309DC)

bill mart · Dec 24, 2013

thanks for the info, think I would do any good putting them in the classifieds? Bill

rustyfarmall · Dec 25, 2013

(quoted from post at 19:37:24 12/24/13) thanks for the info, think I would do any good putting them in the classifieds? Bill

Somebody, somewhere wants them. I once had a N.O.S. Champion for a Waukesha diesel. I never listed it for sale anywhere, but I did talk about it a little in these forums. Didn't really care if I sold it or not, but a couple years later I heard from someone who actually needed THAT spark plug to finish up a restoration. So I sold it.

spark plug question

billmart

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rustred

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Bob

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bill mart

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rustyfarmall

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