5.9-litre diesel engine

The utility model provides a 5.9-litre diesel engine which comprises an engine air cylinder body and six air cylinders which are arranged inside the engine air cylinder body, wherein the six air cylinders are in an in-line arrangement, each air cylinder comprises pistons, piston rings, a combustor and air valves, the diameter of each air valve D is 90-110 millimeters, piston stroke S is 100-145 millimeters, and engine total displacement V h is 5.9 +- 0.1 litres. The number of the air valves of each air cylinder of the 5.9-litre diesel engine is 2-6 and the number of the piston rings of the 5.9-litre diesel engine is 2-6. Cylinder sleeves of the 5.9-litre diesel engine are wet-type or dry-type in structural style, cooling mode of the 5.9-litre diesel engine is water-cooled or air-cooled, air inflowing mode of the 5.9-litre diesel engine is pressurizing air inflowing, pressurizing water-air intercooling air inflowing or pressurizing air-air intercooling air inflowing. The combustor of the 5.9-litre diesel engin