I've just replaced the main and rod bearings in my 240D (I think). The engine runs but smokes like a mosquito fogger which it did not do before. I have set the linkage for the injection pump twice now according to the manual (Align the centerpunch mark with the machined...) with no luck. It will only run at a medium RPM, then after a bit it will start revving quite a bit. If I take the throttle back to idle, it will shut off. If his were a gasoline engine, I would say it is flooding; that the fuel is not atomizing correctly. This tractor ran sweetly for about a year and then the crankshaft broke through the front rod bearing journal. Oddly enough, the rod big-end was not stretched, even though the engine would run. One of the mechanical engineers where I work identified it as a textbook casting flaw. The engine sounds good, just cannot control the RPM and the exhaust is smoking as if you were dribbling kerosene in it.