1. Diagnosis and treatment of engine starting difficulty or failure to start and exhaust pipe emitting a large amount of ash and white smoke. The engine is difficult to start, and the exhaust pipe discharges a large amount of gray smoke, which is diesel vapor. Reason a. The engine temperature is too low, diesel oil is not easy to evaporate and burn. b. Poor atomization of injector c. The oil supply is too late. d. The oil supply is too small and the mixture is too lean. e. Cylinder leakage is too much, compression can not reach the ignition temperature. Diagnosis and treatment a. If the Cummins generator engine temperature is too low in cold season, check whether the low temperature starting preheating device fails, that is, whether the preheater control circuit has open circuit, short circuit or preheater failure. b. If the low temperature preheating device is normal, check whether the injection timing is correct. Turn the engine and insert the engine camshaft timing pin,...