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Repeated spark plug failures

J

john *.?-!.* cub owner

Well-known Member
I have a neighbor that owns a Michigan Power Shovel with a Continental 6 cyl engine. Every 2 or 3 months the #1 spark plug fails, not oily or fouled, it just stops sparking. If you hold the plug wire close ot it the spark will not jump to the top of the plug, but will jump to ground. it does have carbon wires, but the spark from the wire will jump to ground a long way, just not to the top of the plug when it goes bad. Only happens on #1 plug. It is as if the center conductor of the plug is open. Any ideas on the cause?
 
Sounds pretty imposible. Put #2cylinder plug in #1 hole, and vice versa. If #1 still fails to be receptive to spark I would change the wire. and #2 now works, I would suspect the wire. Bending it to find a ground might make it able to conduct. Put solid wires, or magnetic supression (pricy) wires on it. Jim
 
UD16 has a built in internal gap building coil voltage.

As the motor warms it increases compression

remember those spark plug cleaners

you added pressure till the plug stopped sparking to test it


so the auxillary gap has allready robbed the reserve capacity of coil now you have a dirty plug failing under pressure

spark plug science

did you know you could charge a capacitor on the distributor tester and toss it to your buddy?
 
Strange... Are these resistor plugs? Might try non
resistors.

Is it possible rain water or coolant is hitting
that plug? Cracking the insulator when it's hot?
 
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