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John Deere Tractors Discussion Forum
Show Parts for Model:

H series Champion sparkplugs

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M.L. Anderson

12-06-2006 13:56:57

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I don’t know much about tractors but sparkplugs are a slightly different case as I am trying to find as many sparkplugs as possible in the 14mm by 7/16” reach and similar to the H10s which were used by Lincoln and Ford from about 1938 up until the 1950s.
It is not a good idea to use two gaskets under the sparkplug as this changes the actual location of the spark itself in the combustion chamber. “H” series Champion sparkplugs are made in (cold) H-9, H-10,-H-11, and H-12 (Hot) heat ranges. Following is a list of sparkplugs that are very similar to the “H” series sparkplugs.

The reach of the sparkplug is the Nominal distance from the shoulder of the sparkplug to the end of the sparkplug threads themselves. It is not necessarily the full distance of the end of the plug as there is a condition called a skirted shell that extends the spark out further into the combustion chamber and also there is another condition called Extended Core Nose that does the same thing but without the Skirt. One of the things not mentioned is the starting of the engine at night darker than pitch if possible and look at the wires and so forth for blue tracking electric signs meaning you need to replace the wire, even new wires can be faulty or any other parts of the electrical system.

All Sparkplugs are 14mm by 7/16” Reach by 13/16” hexagon.

OLD H8…….RH8C……………………………..
OLD H9…….RH8C…….…45L…….4316 & 216
OLD H10……RH10..........4616 & 216
OLD H11……RH10C.........4616 & 216 OLD H12……H12...........4316 & 216 .................43LS.......437
“R” means resistors on Champion, “C” means a Copper core wire, and none of the Champion numbers have Extended Core Nose Plugs("Y"). M.L. Anderson

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M.L. Anderson

12-11-2006 13:03:05

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 Re: H series Champion sparkplugs in reply to M.L. Anderson, 12-06-2006 13:56:57  
Sparkplug lists are notoriously wrong, so see their disclaimer!!! makes every reasonable effort to maintain current, accurate information about the products we sell. However, we rely on the information provided by the manufacturers of each of the products we sell. Therefore, shall not be responsible for any damages or losses caused by actual or suspected incorrect or inaccurate product information found on the site.
Further, shall not be responsible for problems arising from shipping, including but not limited to, delay, damage or loss. My 2005 NGK catalog states above each page of the cross Reference Chart as below; NOTE; Use cross references as guide only. Please see specific vehicle application. Due to differences in design and material, plugs listed in cross reference section are not exactly the same.
My 2005 Denso Catalog has a very similar statement! Sparkplugs made by Bosch(symbol sheet), Denso(2005 catalog) & NGK(2005 catalog) and claimed to be the replacement for the “H” series sparkplugs are actually of the 3/8” length and are not of the proper REACH to be used in “H” series! I can find no reliable place that states that these firms make a sparkplug of the proper REACH. You cannot rely on the sparkplug manufactures to supply fully correct information as even their catalogs have disclaimer sections. I have access to all their symbols either from their catalogs or from their symbols sheets. If one needs a H12 of a hotter range one should go to an extended core nose plug. This is if one can find a sparkplug of the proper heat range! Yours, M.L. Anderson

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Glen in TX

12-07-2006 09:25:54

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 Re: H series Champion sparkplugs in reply to M.L. Anderson, 12-06-2006 13:56:57  
Many with JD Duburque made tractor models will swear that stacking the spark plug gaskets is the way to go on those models and if it works for them it just does. Not sure what your question was if there was one but check with parts vendors that have accurate company catalogs on spark plugs. Not just their chain company BS replacements on puter and you'll find lots of other replacements for your applications in Bosch, Denso or NGK plugs also plus more versions of the other brands you mentioned. Many of todays plugs no longer have the slick glazed surface on porcelain around the electrode so they foul easier with todays gasoline. Have had good luck with Denso U groove plugs for almost 15 years. All plugs are just about foreign made now and staying with a certain brand and not trying others won't help you. No magic plug is going to cure a worn out engine or rich fuel condition though.

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Mike M

12-07-2006 11:31:50

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 Re: H series Champion sparkplugs in reply to Glen in TX, 12-07-2006 09:25:54  
I think your last statement sums it all up !

If they had the engine in good shape and adjusted right they would not have these problems ! When I use my tractors they get ran very little and not hard ,but I don't have the problems most seem to ?

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Glen in TX

12-07-2006 09:59:54

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 Re: H series Champion sparkplugs in reply to Glen in TX, 12-07-2006 09:25:54  
Sorry other link was just HD for commercial applications only. For more automotive ....

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