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Plugs

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jeffcat

Well-known Member
Got a reply in the IH area but I would like a little more eyes looking. On a international cub from 1977 what plugs are best. I remember seeing about two or three months ago a whole boat load of opinions. The older books say 8C or D-16. It had RD-15Y plugs in her. I also think that some nut put car wires on it cause I have never seen orange to the side plug wires on a tractor. I will check if carbon when the rain stops. I know Champions have had many headaches and use autolites in my truck. When I pulled the RD-15Y plugs they just had the normal gray deposits with the #3 plug had just a little soot on it. Poured a little ATF in all four cylinders last night. This morning I just gave a little tug on the fan and SHE TURNS!!!!! Yaaa she isn't stuck after sitting in a storage shed for 5 years. Gas stinks to hi Heavens but I am working on that. Only big problem is the left brake. The cross shaft is VERY stiff. I put oil on it and started doing the wiggle thing and just hope I don't need to pull the cross shaft!. What do you folks think? Thanks Jeffcat
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If it were mine, I would want non-resistor wire core plug wires, and non-resistor spark plugs. Champion D-16 or the equivilant in AutoLite.
 
Ya I'm just looking for what this bunch of guys think. NO WAY do you want carbon wires on a tractor I just thought I'd make a note as to what was on it. Now I just need to get that left brake cross shaft un stuck!
 
(quoted from post at 08:40:49 04/08/15) Ya I'm just looking for what this bunch of guys think. NO WAY do you want carbon wires on a tractor I just thought I'd make a note as to what was on it. Now I just need to get that left brake cross shaft un stuck!
Click to expand...

For what it's worth. The first, non-running Farmall H I bought had only the remnants of spark plug wires. I went to NAPA and bought a set of automotive wires for a 4 cylinder. Those wires were of the carbon-fiber variety. I installed them and the tractor ran just fine. A few years later I replaced those wires with solid core. There was NO difference in how the tractor ran. I should add that the H had the battery ignition distributor. It was NOT a magneto.
 
The main reason for carbon fiber wires was for radio interference suppression. As far as spark plugs, I have found that the Motorcraft or Autolite work best in Ford products. Champion seems to work best in Chrysler products. AC in GM products. I see no reason why ANY competent plug would not be just fine in your tractor. You may have a hard time finding solid core wires. As far as I know, not many are made any more due to radio interference.
 
You will be fine with resistor/non resistor wires and plugs on an engine with a distributor.
 

remember..if its got a coil, the coil voltage will increase as the resistance goes up..


So resistor wires will fire with higher voltage and jump a larger gap.. Solid wires will fire at lower voltage and reguire a smaller gap.

Most folks overlook this basic fact and get it wrong. solid wires will usually require a gap of .022 or even less. Resistance wires can have a spark gap of .035 or even more pending on the coil.


Sit back and watch.....
 
The Champion D16 spark plug was replaced by the D15Y in the 60s for all IH tractors that used that plug. There are still a lot of parts books out there that do not reflect this change.

The new plug is one heat range colder but has an extended tip which makes the effective heat range about the same as the D16. The extended tip puts the spark further into the fuel mixture for better performance.
 
(quoted from post at 10:43:33 04/08/15) The main reason for carbon fiber wires was for radio interference suppression. As far as spark plugs, I have found that the Motorcraft or Autolite work best in Ford products. Champion seems to work best in Chrysler products. AC in GM products. I see no reason why ANY competent plug would not be just fine in your tractor. You may have a hard time finding solid core wires. As far as I know, not many are made any more due to radio interference.
Click to expand...

Solid core wires are readily available at most any farm store, many on-line retailers, and probably right here on YT.
 
Went on down to the local IH dealer and he had a full set of CUB ignition wires on the shelf. They are the wire type and were only $16.oo for the set. I think I done good. He said the RD-15Y is most common with the new garbage gas cause they just work better. OKaaaaay Now HE was out of plugs for "Those old tractors". NAPA one block away had the Autolite 3116 plugs. Okey doeke I have my ignition stuff.
I removed the cap and it is spotless. Will also clean the points with stiff cardboard and carb cleaner. Yesterday I put some ATF in all of the cylinders and this morning I could turn the engine a little with the fan.! Yaaaaaa. I am getting there. Jeffcat
 
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