Bitzer 4NC piston kit works under high temperature, high pressure, high speed, and poor lubrication conditions. The Bitzer 4NC piston kit is in direct contact with high-temperature gas, and the instantaneous temperature can reach above 2500K. Therefore, the heating is serious and the heat dissipation conditions are very poor. Therefore, the temperature of the piston is very high when it is working, the top is as high as 600-700K, and the temperature distribution is very uneven; The top of the piston bears a lot of gas pressure, especially the working stroke pressure is the highest, the gasoline engine is as high as 3～5MPa, the diesel engine is as high as 6～9MPa, which makes the Bitzer 4NC piston kit produce impact and bear the effect of side pressure; Bitzer 4NC piston kit is in The cylinder reciprocates at a very high speed (8-12m/s), and the speed is constantly changing, which generates a large inertial force, which makes the piston subject to a large additional load. Bitzer 4NC piston kit works under such harsh conditions, it will deform and accelerate wear, it will also generate additional load and thermal stress, and at the same time will be subject to the chemical corrosion of the gas.

Bitzer 4NC piston kit inspection mainly measures the diameter of the skirt, the height of the piston ring groove and the size of the piston pin seat hole:

①The selection of Bitzer 4NC piston kit should be determined according to the repaired size of the cylinder. Usually the enlarged size value is marked on the piston top;

②The structure of the Bitzer 4NC piston kit is not necessarily the same in the same series. Therefore, when purchasing pistons, the corresponding Bitzer 4NC piston kit must be selected according to the engine type. On the same engine, the same Bitzer 4NC piston kit should be selected. Pistons of the same brand, the same group or the same product code; the pistons of the same product code must be used for the same model to ensure that the diameter and quality difference of the Bitzer 4NC piston kit does not exceed the original manufacturer's specified range. Otherwise, it will cause poor engine combustion and rough work. , The economy and power are reduced and other failures. Therefore, when choosing Bitzer 4NC piston kit, the Bitzer 4NC piston kit of the corresponding model must be selected according to the type of engine.