spark plugs

s19438

Well-known Member
I know its been asked a bazillion times but what spark plug do you guys use in a TO-35 w/134 engine ?
thanks.
 
I've used Autolite 3116 and Champion D18Y with no problems using either one. If you have a tractor that burns oil or just does very light duty work you can step up to a Champion D21 which is a hotter plug than the 3116 or the D18Y and it does not have a projected tip like the 3116 or D18Y so it won't foul out as easily. Autolite does not have a hotter plug than the 3116 in the non resistor plugs. In the resistor plugs the 386 is the standard plug and the 388 is hotter but I would recommend staying away from resistor plugs if you can.
 
Sounds like a set of plug extenders from Napa is what you need if the plugs are getting oil fouled.They keep the plug away from the oil and no special tools are needed just screw the plug into the extender and then extender into head.
 
(quoted from post at 06:36:40 06/07/13) I've used Autolite 3116 and Champion D18Y with no problems using either one. If you have a tractor that burns oil or just does very light duty work you can step up to a Champion D21 which is a hotter plug than the 3116 or the D18Y and it does not have a projected tip like the 3116 or D18Y so it won't foul out as easily. Autolite does not have a hotter plug than the 3116 in the non resistor plugs. In the resistor plugs the 386 is the standard plug and the 388 is hotter but I would recommend staying away from resistor plugs if you can.
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When i bought my TO-35 about 20 years ago it had " Champion D-23 " in it. NAPA told me i needed " Champion RD16 . I tried them but they were only good for a 8 hours , then i had to stop and clean them before i could go on. So i went back to the D-23 and can go though about 100 gal. of fuel before cleaning them. Over the last 20 years i have only replaced them 3 or 4 times. I'm guessing the RD16 are resistor plugs? This is in a ' Continental ZB-134 ' engine . I was told they are a little different than the Z- 134, pistons maybe ? The engine block has a metal tag riveted next to the engine tag that says"Do not use below 5000 ft. elevation" . I am operating it at about 2500 ft. and runs good other than oiling the plugs up since i got it.
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RD16 is a resistor plug and a cool plug. They probably
recommended a cooler plug because your engine is a high
altitude engine and it probably has higher compression than
the standard Z134 engine.
 
(quoted from post at 16:49:27 06/09/13) RD16 is a resistor plug and a cool plug. They probably
recommended a cooler plug because your engine is a high
altitude engine and it probably has higher compression than
the standard Z134 engine.

Like i said it will run only 8 hours on that plug and then i have to clean it. It runs good on the Champion D-23 , is it a hotter plug ? That's what was in it when i bought it years ago. It is a higher compression engine than the Continental Z-134.
 
Yes the D23 is the hottest plug in that series of plug and it's
non resistor which is also recommended. D18Y is what
Champion recommends for most of the Z engines and it is
hotter than the RD16 also it is a projected tip plug. You could
also try the D21 Champion which is cooler than the D23 but
still hotter than the RD16 or D18Y. It kind of depends on what
you use the tractor for. If it is just used occasionally for light
work then it probably would need a D21 or D23 to keep them
from fouling out. But in general don't run a hotter plug than you
have to.
 

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