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Engine dieseling

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Madison Mitch

12-07-2003 18:00:01




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My Ford 4000 Gasoline tractor keeps running (dieseling)after I turn off the engine. What kind of adjustments do I need to make.




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Fern(Mi)

01-01-2004 16:29:47




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 Re: Engine dieseling in reply to Madison Mitch, 12-07-2003 18:00:01  
I gave up on the dieselng problem. I let the mechanical critter quit in its own sweet time. Usually only a few seconds. The old engine wasn't built for the unleade gasolines we use. Some tractors and other engnes are manufactured with electrical shut off switches built inyo their carborators. Another alternative, shut off the gass and let the dan engine run itself out. I've decided yo let it go.

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Kevin (FL)

12-31-2003 06:50:31




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 Re: Engine dieseling in reply to Madison Mitch, 12-07-2003 18:00:01  
Cole in MO mentioned this, but I'll expand a little. Most dieseling problems I've seen are caused by ignition timing being set with too much advance or too high an idle speed. Get a timing light and check timing advance at idle and make sure idle speed is correct. Adjust carb mixture and idle speed as needed prior to timing check. If timing is advanced too much, you may have to re-adjust idle speed back up to correct idle speed. To a lesser extent, poor gas quality (too low an octane) can be a problem too, but most gas tractor engines have low compression ratios so that's unlikely. (excluding you pullers out there with 10 to 1 pistons) The carbon buildup is also a good possibility for tractors not being used very often and not loaded up at higher RPM's. Carbon buildup does two things--enough of it in the cylinder causes a "virtual rise" in the engine's compression ratio by taking up volume in the combustion area and secondly, pieces of carbon can be glowing red after shutdown of ignition--these pieces provide a "spark" that keeps the engine running, even after shutting off ignition. John's mention of water will work--my uncle in Louisiana showed me that trick about 30 years ago. Just make sure you have good RPM and pour sparingly. The engine RPM will drop and steam/carbon will blast out of the exhaust.

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John K

12-09-2003 07:06:01




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 Re: Engine dieseling in reply to Madison Mitch, 12-07-2003 18:00:01  
Just about every time I ran into a deiseling problem, I found the carb was set a little to the rich side which in turn caused a carbon build up. To get rid of the carbon, I either worked the engine hard or would slowly pour a SMALL stream of water down the carb with the engine running at about 2000 rpm for about a minute. You don't want to kill the engine, you will have to feather the throtle to maintain rpm as you add the water. If you add the water to quickly, you can damage your pistons or rings. You will see carbon coming out of the exhaust pipe while doing this and for a short time after. I have never used more than a quart of water. Others may not approve of this but I have had good luck so far.

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JERRY

12-08-2003 14:13:28




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 Re: Engine dieseling in reply to Madison Mitch, 12-07-2003 18:00:01  
I would try a tank of hi test gas. i did on my golf kart truck and it worked. Worth a try. Hope it works.



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cole in mo.

12-08-2003 02:29:48




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 Re: Engine dieseling in reply to Madison Mitch, 12-07-2003 18:00:01  
how has the tractor been used? has it been loafed around and carboned up? this would make it run on after turning off the switch, hot carbon acts like a spark plug. the timing or the idle could be set to fast. will it die after it has idled for a few minutes? if so, sounds like carbon build up. maby others can shed some light on it for you.



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