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Allis Chalmers Discussion Forum

Allia B Spark Plugs

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Jay Liedman

06-04-2019 06:28:40

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My Allis B seems to be fouling its plugs faster than it ought to. I know that an engine overhaul is probably in the future, but would using a different spark plug number or brand possibly help me limp through the summer? The plugs in it now are Champion J8C. Surprisingly, the engine does not really smoke very much at all. Any ideas?

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06-15-2019 07:02:54

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 Re: Allia B Spark Plugs in reply to Jay Liedman, 06-04-2019 06:28:40  
I have seen as many NGKs fail asd Champions in recent years. I have no brand loyalty nor do I believe in any magic by one brand over another.

If I had your issue with J8C Champions, I'd try a hotter plug with an electrode designed for oil burning. LJ12J used to be made for that purpose but I think it was discontinued. J12C is a little hotter then what you have plus it is often used in two-stroke-cycle engines running an oil-mix. That would be my choice. Or, if you really think a Japanese plug is somehow better - a NGK B2 or Nippo Denso W9-U.

Allis Chalmers B from the factory when run on kerosene used an Auto-Lite A9, which is equivalent to a Champion J11C or J12C.

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Dan Musil

06-04-2019 20:22:40

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 Re: Allia B Spark Plugs in reply to Jay Liedman, 06-04-2019 06:28:40  
I got a old WD that used to be hard on plugs, E 30 sure helped it, ran cooler and cleaner

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06-04-2019 14:51:27

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 Re: Allia B Spark Plugs in reply to Jay Liedman, 06-04-2019 06:28:40  
Is it running up to temperature? !80 deg. thermostat unless you work hard in hot weather them MAYBE a 160.

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06-04-2019 08:38:17

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 Re: Allia B Spark Plugs in reply to Jay Liedman, 06-04-2019 06:28:40  
Yes a different plug may help. I would use an NGK in a heat range that is a bit hotter then that champ. Now days champ and auto lite plug do not hold up as well as they once did since there not made here in the U.S. but instead made in the land of almost right

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06-04-2019 16:58:26

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 Re: Allia B Spark Plugs in reply to old, 06-04-2019 08:38:17  
I second the vote on NGK, if you need the number I will be in the shop on Thursday that's what I have run since pitting for a motocross team in the mid 80's they can take a lot of abuse and just keep on firing. TJ

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Jay Liedman

06-04-2019 20:33:08

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 Re: Allia B Spark Plugs in reply to T.J.-A.C., 06-04-2019 16:58:26  
Yes, I would appreciate the recommended NGK plug number. Thanks!

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06-05-2019 08:57:48

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 Re: Allia B Spark Plugs in reply to Jay Liedman, 06-04-2019 20:33:08  
NGK B6F is the number.

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