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Farmall & IHC Tractors Discussion Forum
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M fouling plugs

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chadd

10-12-2006 07:27:20




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Our M seems to be fouling out plugs very quickly. You will put a new set of plugs in any after 3 or 4 hours of running it will start to miss. When you restart it the next morning, it will be down one or two cylinders. When you remove the plugs they have some sort of soot or black stuff on them that occasionally bridges the gap between the electrodes. It doesn't smoke at all when running at constant throttle, but the moment the throttle is opened up or the governor kicks in it blows a grey soot out of the exhaust. It has a delco distributor on it which I replaced the points on recently. I reset the points to the IH factory gap for the IH distributor; could this be part of the problem? Otherwise is it a carb issue? It uses a little oil, but not enough to be seen when running(i.e no blue smoke except a few whisps on start-up). Thanks,

Chad

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Wes in Ohio

10-12-2006 21:36:29




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 Re: M fouling plugs in reply to chadd, 10-12-2006 07:27:20  
Had a similar problem about a month ago on my 300 U, tried hotter plugs and that just made it run alittle longer, discovered that the advancing spring in the distributar were so weak it was running at full advance in idle, used alot of fuel also, check your timing to see if your engine advances with your thottle, if it doesn't check your springs
wes



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Smith1000

10-12-2006 18:27:02




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 Re: M fouling plugs in reply to chadd, 10-12-2006 07:27:20  
Put in the hottest plug you can get. Had the same problem on our 300U for years. We must have put in a 100 plugs as it would foul them to the point it wouldn"t hardly pull a load in just a matter of hours. We would hang the plug wires so they would arc to get a little more time out of them. Still have spark plugs everywhere. Someone on this board said to put in the hottest Champion plug (D-18 or D-21 something like that). It has been well over a year since I have changed the plugs out and it is still running well. It had some heavy use over the summer too.

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Bob M

10-12-2006 07:46:13




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 Re: M fouling plugs in reply to chadd, 10-12-2006 07:27:20  
Probably a couple things going on:

1 - Carb is set too rich. Try turning the carb high speed mixture screw 1/4 turn at a time until the gray in the exhaust pretty much disappears when you snap the throttle open. But don't turn the screw in so far the engine stumbles when you open the throttle. Also check to make sure there's no restriction in the air cleaner or air inlet tube before making any adjustments!

2 - Spark plug heat range is too cold. Recommend Champion D-21, Autolite 386 or equivalent for a good, "hotter" plug.

Not likely it's a problem with the distributor point gap. Set 'em about 0.020 and the ignition should work fine.

Also a brief blue whisp in the exhaust at startup is pretty much normal for the letter series tractors. Not likely you have an oil-fouling plug problem.

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old

10-12-2006 07:43:59




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 Re: M fouling plugs in reply to chadd, 10-12-2006 07:27:20  
Sounds like you have the carb set way to rich and you need to turn the main adjustment in a turn or 2. Adjust it down to the point you start to loose power then back it off a half tunr at a time till you get power but not fouling the plugs



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John T

10-12-2006 07:40:15




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 Re: M fouling plugs in reply to chadd, 10-12-2006 07:27:20  
Chadd, If theres a flat black colored powdery sooty even residue on the plugs fouling them that can be excess unburned fuel. Among things that can help that problem are to use a hotter heat range plug, the use of thermostat or radiator air restrictions etc to get n keep the engine temperature up higher, and ESPECIALLY dont run the carb any richer then necessary and make sure the choke butterfly plates is fully open n syays there and theres no inlet air restrictions in the air cleaner or inlet piping etc. Of course, a good hot ignition system including clean proper gapped points with a good condensor and wire core plug wires. If the spark plugs spark is a faint thin wimpy yellow spark (ignition problem) versus a good visible blue spark, that can cause premature plug fouling also.

John T

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Allan In NE

10-12-2006 07:40:01




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 Re: M fouling plugs in reply to chadd, 10-12-2006 07:27:20  
Hey Chadd,

Short of an engine overhaul, use Champion D-21 plugs and if possible find an electronic ignition kit.

Then put the plug gap out to around .040 or .045" (the solid state will handle it).

Won't stop the fouling completely, but will sure extend the life of your plug cleaning a bunch.

Allan



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Will Sick

10-12-2006 07:34:20




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 Re: M fouling plugs in reply to chadd, 10-12-2006 07:27:20  
You might want to try a hotter plug. Does the tractor run at 180 or so degrees. This would help too.



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