From the working process of diesel engines, we know that the diesel fuel injected into the cylinder and buring after mixed with hot air, then the power can be generated. Therefore, the size of output power related with the intake natural air volume and the amount of diesel that can be burned. At high altitudes, air density decreases and atmospheric air sucked into the cylinder decreases due to the drop in atmospheric pressure, which limits the amount of diesel that can be combusted and output power drops. For the same reason, the air temperature or the humidity is high will also lower down the diesel engine output. Therefore, using diesel engines in different regions or in different atmospheric conditions in the same area should take into account such changes in power output. For example, the same diesel engine can emit less power in summer than in winter.

Diesel engine in the diesel generator set works, many parts under a certain load at a relatively high speed relative sliding or rotating, such as piston and cylinder liner, crankshaft and bearings. Although the surface of these parts have different degrees of lubrication, but with the increase of working time, the contact surfaces will wear due to friction, and gradually undermined the original size and geometry. This normal wear is often referred to as “natural wear and tear” and is actually unavoidable. But by no means does this mean that we are powerless to wear and tear and listen to it naturally. In fact, by taking the correct measures in selecting the materials of the parts, adopting advanced and reasonable heat treatment methods, improving the processing quality and coordination of the contact surfaces of the parts, improving the cooling and lubrication, and timely maintenance, the wear will be significantly reduced, so as to improve the reliability of diesel engine and prolong the service life.

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