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Soot in plugs

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Jack in TN

12-21-2001 19:06:02

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I have a 1949 8N that runs and starts good most of the time. However, I find black soot on the plugs after running for a period of time. I have updated everything on the tractor except I have not done anything with the carb. but check to see if it is clean and gas flows good. Does anyone have a suggestion as to stopping this unburned fuel problem?

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Jim(FL)

12-22-2001 06:36:34

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Re: Soot in plugs in reply to Jack in TN, 12-21-2001 19:06:02

Jack I agree with Ed below, Black "soot" means rich fuel mixture.

However, if you have black "wet looking" deposits it may mean poor rings (oil getting by into the combustion chamber).

If just soot - don't change to hotter plug (not necessary), just adjust the fuel mixture to the correct leaner mixture and be sure to check and make sure the air filter is clean and proper weight oil is being used in the "bath".

If wet looking black deposit - Yes try a hotter plug to help burn off the oil and most likely leave the mixture setting as is.

Hope this helps, Jim

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Gaspump

12-22-2001 06:29:10

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Re: Soot in plugs in reply to Jack in TN, 12-21-2001 19:06:02

Are you running with or without a thermostat. In cool weather you will not reach operating temp without one. Could also be carb float or mix and/or timing.

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Bert

12-22-2001 05:02:20

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Re: Soot in plugs in reply to Jack in TN, 12-21-2001 19:06:02

Too rich could be not enough air due to dirty air cleaner.

Try Autolite 437s, they are a bit hotter.

If you have time go ahead and rebuild the carb. Parts are cheap and theres a good tutorial in the archives.

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ED-Illinois

12-22-2001 03:09:53

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Re: Soot in plugs in reply to Jack in TN, 12-21-2001 19:06:02

possible solutions -

1) adjust fuel mix (black plugs too rich, white too lean)

2) spark plug extenders (don't know how they work but understand that they prevent fouling)

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Different plugs

12-21-2001 19:46:54

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Re: Soot in plugs in reply to Jack in TN, 12-21-2001 19:06:02

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