Many users are very worried about being deceived during the purchasing process of generator sets, fearing that old equipment will be refurbished and passed off as new equipment. According to the experience of some Haixing Power technicians and veteran operators, the method of first asking, second viewing, and third test can be adopted to identify the newness of an old diesel engine. The first question is to ask about the purchase time, purpose and reason of sale of the diesel engine, the repair status and the main parts that have been replaced, and any problems during use, etc., so as to have a more comprehensive understanding of the engine. The second inspection is to first check whether the model is obsolete, then look at the newness of the diesel engine from the appearance, and check whether the parts are complete and whether they are damaged. Third test: It is to test the engine. The specific method of the diesel generator set is: 1. Rotate the crankshaft to make the fuel injection pump supply fuel. If the fuel injector emits a crisp fuel injection sound, it means that the performance of the plunger pair and fuel injector is good; if the gear There is no abnormal sound in the room, indicating that the gears are not worn properly.