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Someone mentioned “engine piston perforation” occurred in Tianlong truck. Many people know that the current engine reinforcement is very high and the current Renault engine that is applied in Tianlong truck already adopted discriptors articulated piston with steel head and aluminium skirt. But the steel head piston is still perforated, what is the reason? From the picture, we can see that the steel head of piston in the fifth cylinder has an aperture and the piston surface is full of carbon deposit. At first, it is suspected that the lubricating nipple may have oil leakage problem and it results in over-temperature of piston head, thus leading to perforation. Six injectors were sent for inspection and the results showed that they were all in good working state, so it indicates that this is not a failure caused by the truck itself, but human factors. Since it is not caused by injectors and quality of piston, this failure becomes very typical. From inquires, it was learned that thi...

Piston is the “heart” of engine and bears mechanical load and thermal load of alternation, so it is one of the key parts in engine that runs in the worst condition. The role of piston is to bear gas pressure and transfers it to connecting rod via piston pin to drive bent axle. The piston top is also the part of the combustion chamber. Piston works under high temperature, high pressure, high speed and poor lubricating condition. Piston is exposed to high temperature gas and the transient temperature can reach 2500K, therefore, it is severely heated but the heat emission condition is bad; the working temperature of piston is very high and the top can reach 600~700K, and the temperature distribution is not even; the gas pressure of piston is very large, especially the power stroke" the gasoline engine can reach 3~5MPa and the diesel engine can reach 6~9 MPa, which greatly strikes the piston, and it also bears the effect of side pressure; the piston carries out reciprocating motion ...