SMTA Oil Pressure

The problem of dieseling is not related to oil pressure at all - other than the fact that there is no oil pressure present when the engine - thus the oil pump is running backward. There are some very hot surfaces in the combustion chamber that cause the fuel to ignite even without an arc at the spark plug. If you have oil coming out of the air inlet when it diesels, it is, in fact, running backwards. That oil is coming from the oil cleaner cup. Be sure to check that the oil level is up to the mark in the cup if the engine has blown some out.

Some things to do to relieve the dieseling problem are to let the engine idle for several minutes to "cool down" before shutting it off or turning off the fuel and let the carb run out of gas. If you do the latter, be sure to turn the ignition switch off before leaving the tractor.

Try to run something on you fuel to clean the carbon from the engine and you should fix the problem.

I hae one tractor that has doen this for years and I can't seem to get it to stop so I just use the choke and will suffer higher engine wear if I am washing the cylinders with gasoline but I hit the choke just as it dies and don't think I'm getting much gas in the engine.