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Super Trucker

08-26-2012 11:32:35

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What plugs are used in a 39 wc? Somebody put taper fit auto plugs in.

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08-26-2012 19:20:45

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 Re: SPARK PLUGS FOR A 39 WC in reply to Super Trucker, 08-26-2012 11:32:35  
Champion J8 or the hotter J11.
Champion seem to work the best in my Allis's

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08-26-2012 17:39:03

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 Re: SPARK PLUGS FOR A 39 WC in reply to Super Trucker, 08-26-2012 11:32:35  
ac delco r45 or r43

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08-26-2012 16:55:47

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 Re: SPARK PLUGS FOR A 39 WC in reply to MMEd, 08-26-2012 11:32:35  
The original recommended spark plugs were the Champion J-8C, AC 45 and Autolite AN7. These plugs were in the medium heat range. The replacement plug for the AN7 is the 295 which is a hotter plug. Regardless of some people's bias for certain brands I would stay with the original heat range as is designated by the manufacture of the engine. If you find the plugs fowling due to engine wear, incrementally move to the next heat range. Be careful not to go to high as this will cause pre-ignition and could cause the tip to burn off which in turn will damage the engine.

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08-26-2012 14:11:40

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 Re: SPARK PLUGS FOR A 39 WC in reply to Super Trucker, 08-26-2012 11:32:35  
Autolite 295 will fit and be better than a Champion.

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08-26-2012 12:02:31

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 Re: SPARK PLUGS FOR A 39 WC in reply to brian styve, 08-26-2012 11:32:35  
Champion J-8C (readily available)
This post was edited by mdtractormechanic at 11:32:47 08/28/12.

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