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Allis Chalmers Discussion Forum

Spark Plugs in a B

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Nick WI

05-08-2008 10:46:26

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I'm changing the head gasket in my Allis B. So with the head off I thought it would be a good time to change spark plugs too. I bought a set of Autolite #295 plugs. These new plugs are about 3/16" shorter then the Champions L88 that where in the engine. The Autolite plug electros end up flush with the theaded area in the head and do not protrude into the combustion chamber. The Champions electros are in the combustion chamber like I think they should be. Should I use the new Autolites or go back with new L88 Champions. Any help or comments would be appreciated. Thanks, Nick.

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Jerry Coulter

05-08-2008 17:56:16

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 Re: Spark Plugs in a B in reply to Nick WI, 05-08-2008 10:46:26  
I never heard of L88 Champions, but the proper plug has 3/8" reach like Champion J8 or AC45. The threads of the plug should never extend into the combustion chamber, because if they become carboned, you couldn't get them out.

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