Re: Where do you stop??

Posted by Janicholson on October 10, 2005 at 19:49:48 from (66.173.50.76):

In Reply to: Re: Where do you stop?? posted by P and R Pete on October 10, 2005 at 18:35:46:

Timing can have a very minor impact on running on.
When the ignition is shut off the spark plugs stop sparking, thus timing is not happening.

However---if the timing is set retarded so much, or advanced so much that the tractor heats badley from being way off, then the heating will over heat the spark plugs, valve edges, and combustion chamber edges to the point that they become incandescent (glow red). This destructive condition can lead to Running on because the glowing parts set the mixture on fire as the piston comes up. making as if to go on forever.

Most farmalls will run on to one degree or another if shut off from a hard full effort workout with out a few minutes cooldown. (the fuel solenoid on newer tractors stopped this by stopping fuel.

I'd bet yours is carboned up in the combustion chambers from running rich. This has two issues. One, the compression is much higher than normal from the deposits, creating extra heat. And two, the carbon is a great source of glowing igniter. The solutions are two. Run it and clean it by operating correctly (listen for pinging and you might need to run medium octane fuel till it clears the carbon). Or, remove the carbon (many theories on adding various fluids while it is running --I do not subscribe to them--) and or remove the head and wire brush the devil out of it. with a 1" wire cup in a drill. (wear a respirator to do this because the material will be lead contamination and that is not good for you.
Great letting you in on what I know. JimN

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