Diesel Engine is an In-line, four-stroke, water-cooling high-speed diesel engine with a swirl combustion chamber or a direct-injection combustion chamber. Diesel Engine is improved significantly and designed based on the former 495 Series diesel engine. In this way, its power, economy, reliability and service life reach the advanced level among those of like products in and it is awarded the title of quality product and passes the reliability test. This series is named as the energy-saving internal combustion engine in Diesel Engine matches, optimizes and customizes the engine and the assembly according to the assembly configuration and the actual use; it has good supporting adaptability with multiple options for flywheel, flywheel housing and alternator available.