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Harry Ferguson Tractors Discussion Forum
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Re: spark plugs

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Jason S.

06-07-2013 05:36:40
174.237.39.167



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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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4on-the-floor

06-09-2013 11:02:01
74.36.1.165



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 Re: spark plugs in reply to Jason S., 06-07-2013 05:36:40  
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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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Jason S.

06-09-2013 15:49:27
174.228.0.127



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 Re: spark plugs in reply to 4on-the-floor, 06-09-2013 11:02:01  
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.



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4on-the-floor

06-09-2013 16:16:15
74.36.1.165



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 Re: spark plugs in reply to Jason S., 06-09-2013 15:49:27  
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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.



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Jason S.

06-09-2013 17:19:52
174.228.0.127



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 Re: spark plugs in reply to 4on-the-floor, 06-09-2013 16:16:15  
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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