B series diesel engine is the four stroke, the single row, the erect,the water cooling, the electricity start, use the compulsion and the compound lubrication, its main feature is changes the spheroidal combustion chamber the ω combustion chamber, has carried on the strengthened design to the major parts. Its explosion pressure is high, the power big, easy to start, the user may act according to the different power the request to carry on the match. Their main application may take powers and so on tractor, combine, drainage and irrigation equipment, engineering machinery.