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Discussion Forum

Carbonizing plugs

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06-06-2002 07:35:41

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We have a Farmall M that is producing heavy deposits of carbon on the spark plugs -- bad enough that a set of plugs broke down in 2 weeks running. The tractor is being used both for heavy pulling (disk harrow etc.) and slow speed light duty work (seed planter). We're using 87 octane fuel, and no lead substitute. Is it likely a carbureter problem, a fuel problem, or a timing problem? Or a combination of all 3?

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Ray A

06-07-2002 17:15:08

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 Re: carbonizing plugs in reply to rkg, 06-06-2002 07:35:41  
Had an H with about the same problem, only it would foul plugs out in about a day or two. I cleaned the air intake oil bath (scrubed out old goo/added new oil etc.) and it hasnt fowled them out since then that I know of.

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06-06-2002 18:01:56

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 Re: carbonizing plugs in reply to rkg, 06-06-2002 07:35:41  
What are you using for plugs. Today's gas needs a hotter spark plug. I had similar trouble with my 300U and I put in D21 plugs and it fixed the problem. If you're tractor is running too rich it will fowl the plugs rather quickly - had that problem on my M.

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06-06-2002 08:51:13

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 Re: carbonizing plugs in reply to rkg, 06-06-2002 07:35:41  
What's the inside of the exhaust pipe look like?? Running rich? Many on this forum don't like Champion plugs but you might try another brand? G.

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06-06-2002 08:29:01

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 Re: carbonizing plugs in reply to rkg, 06-06-2002 07:35:41  
Is your compression good? Are you burning oil?

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06-06-2002 08:15:01

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 Re: carbonizing plugs in reply to rkg, 06-06-2002 07:35:41  
You may want to try this but it could be that the oil bath air cleaner needs to be cleaned. My H was always hard to start and fouled up the plugs until I pulled the rubber air intake tube off of the carberator. today I just made an aluminum tube to fit over the carb/ air intake and use a piece of heavy air filter paper instead of the oil bath filter. I dont know if I will screw anything up by using a paper element.

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06-06-2002 20:05:59

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 Re: Re: carbonizing plugs in reply to KURT, 06-06-2002 08:15:01  
I wouldn't give up the factory air cleaner! these were put on for a purpose. if the screen is plugged try flushing it out with kerosene or solvent. you can take the whole unit off if need be and dunk it in a bucket, but get it clean and hook it back up!

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