Piston work in high-temperature, high-pressure, high-speed, poor lubrication conditions. Pistons direct contact with high temperature gas instantaneous temperature up to 2500K therefore, heated serious, and cooling conditions poor, so the piston work when the temperature is high, the top of the up to 600 ~ 700K, and the temperature distribution is very uneven; piston top bear gas pressure, in particular the greatest pressure, as a power stroke gasoline up to from 3 ~~ 5 MPa, diesel engine up to 6 to 9MPa, which makes the piston an impact, and to withstand the side pressure; piston within the cylinder at a high speed (8 ~ 12m / s) reciprocating motion, and the speed in the constantly changing, which produced a large inertial force, the piston subject to significant additional load. The work of the piston in such harsh conditions, will produce a deformation and accelerated wear, but also produce the additional load and thermal stress, while by the chemical corrosion of the gas.
    Piston test is the measurement of the diameter of the skirt, the height of the piston ring groove and piston pin hole size.
    1.Repair size of the cylinder 1 piston optional should determine. Usually increase the size numeric label at the top of the piston.
    2.send the fish in the same series leaves, the piston structure are not necessarily the same as the corresponding type used according to the type of engine piston must buy piston on the same engine, should be used in the same label, the same group or piston piston of the same product code; same models must use the same product code to ensure that the the piston diameter difference and quality difference does not exceed the scope of the original provisions. otherwise, it will cause poor combustion engine, brutal work, economy and power decreased failure therefore, must be based on the engine type of the corresponding model used in the optional piston piston.