spark plug numbers for d17

deene

Member
ok so I bought new pints set condenser and plugs today, n11yc champions is what they gave me but the threaded part is 3/4 in long, they said they also have a 3/8 threaded plug, what number do you guys use, why are there 2 different plug lengths? thanks for the continued help on this machine, by the way I sure don't like the points set with the doughnut contact on the bottom but they didn't have any of the solid contacts with any of the different brands. have great evening
 
There is two different cylinder head designs. The early heads use 3/8" reach plugs while later ones use 3/4" reach. With parts switching over the years one cannot be certain which head he has by the year of the tractor or certainly not by what reach plug was removed, have several times removed the wrong ones. You must look in the hole and determain which head you have. The Autolite numbers are 295 for 3/8" reach and 405 for 3/4" long reach. AC numbers would be 45 and 45XL
 

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