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Farmall & IHC Tractors Discussion Forum
Show Parts for Model:

Spark plug issue on farmall H, is it the plug of the wire?

Author  [Modern View]
Fort steele tractors

02-23-2014 21:01:14
192.81.53.246



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I have an issues with a rough running engine on my farmall H, I've traced down to a poor spark issue on one of the plugs. When the plug wire is connected properly it gets hardly any spark and the engine runs rough. I pull the wire off and let hang lose , about 1/4 inch a way there is nice clear spark and the engine runs great. I put back on and runs rough.

I've cleaned the connection on both the plug and wire to ensure they are contacting. Kinda stumped for know, what's the quick solution?

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John T

02-24-2014 07:09:37
173.98.21.52



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 Re: Spark plug issue on farmall H, is it the plug of the wire? in reply to Fort steele tractors, 02-23-2014 21:01:14  
My best guess (if pulling wire off a bit helps) is the plug is starting to foul. Id run a hotter plug, the 388 is a tad hotter then the original 386 but for a tractor that shows its age and/or its used for light duty Id run the hotter 388. HOWEVER and especially if its a Magneto Ignition, Id use the NON Resistor 3116 Autolite Plug.

John T



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mkirsch

02-24-2014 05:25:45
65.199.189.6



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 Re: Spark plug issue on farmall H, is it the plug of the wir in reply to Fort steele tractors, 02-23-2014 21:01:14  
There's more than one plug, but the "hot" one is about the best for "puttering around" to prevent the plugs from fouling.

You'd want a cooler plug if you were working the tractor.



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FBH44

02-23-2014 22:45:01
64.85.217.41



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 Re: Spark plug issue on farmall H, is it the plug of the wire? in reply to Fort steele tractors, 02-23-2014 21:01:14  
That"s what I understand, the Autolite 388 is the hottest. I believe Autolite numbers their plugs upwards in "hotness". I think the longer the center ceramic part of the electrode, the hotter it runs. I run 388"s in my "H".



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Fort steele tractors

02-23-2014 21:31:27
192.81.53.246



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 Re: Spark plug issue on farmall H, is it the plug of the wire? in reply to Fort steele tractors, 02-23-2014 21:01:14  
Thanks, I was having a hunch that is what was going on. Now my second questions, what is the correct modern spark plug for this tractor.
I read somewhere an Autolight 388?

Will a napa auto parts carry these?



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rustyfarmall

02-24-2014 07:02:19
208.126.186.41



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 Re: Spark plug issue on farmall H, is it the plug of the wir in reply to Fort steele tractors, 02-23-2014 21:31:27  
Quoting Removed, click Modern View to see

If your H has a magneto ignition, you want the Autolite 3116. The 3116 is a non-resistor plug and works much better with a magneto. If you have a battery ignition distributer, the either the Autolite 386 (cooler), or the 388.



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Bob

02-23-2014 21:18:57
64.255.159.192



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 Re: Spark plug issue on farmall H, is it the plug of the wire? in reply to Fort steele tractors, 02-23-2014 21:01:14  
You have re-discovered the "spark intensifier", which Meissner figured out in 1918!!!!



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Bob M

02-23-2014 21:08:35
74.67.191.209



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 Re: Spark plug issue on farmall H, is it the plug of the wire? in reply to Fort steele tractors, 02-23-2014 21:01:14  
Problem is the plug partially fouled.

Thoroughly clean and regap plug, or better yet replace it with new and the problem will disappear.



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