Posted by RN on May 20, 2013 at 09:48:20 from (205.213.104.118):
In Reply to: gas engine desieling posted by shane masters on May 20, 2013 at 09:35:04:
How long since the head was off to decarbonize?? Uncles WD45 had dieseling- pulled head and found about 1/2 cup of carbon in each cylinder. Cleaned and reinstall, no dieseling, run smooth ut seemed a bit less power- in affect the carbon acted like a high compression piston during work runs and the deiseling was from the hot edge of carbon coat igniting fuel mix after sparks from spark plug stopped. How is oil comsumption? a cup of oil a week getting by rings and valves means some unburned carbon build up inside cylinders. Some carb cleane pour down carb throat at fast idle or just some water vapor may help loosen some of the carbon- otherwise pull head and scrape. A fiber optic probe inside the spark plug hole can show carbon build up without removeing head. Valve lip margin is another possible hot spot source- and combined with carbon build up on valve face can be cause of dieseling. Old tractor shutoff drill was simple turn off the gas tank petcock and let engine idle down a couple minutes as it ran out of fuel, no dieseling without some gas vapor in cylinder. The final lean mix would also take out a little bit of unburned carbon. Extra hot head from coolant crud is a third source- temperature guage read in red zone moost of time? RN
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