Many users are very worried about being deceived during the procurement of generator sets, and are afraid of renovating old equipment and impersonating new equipment. According to the experience of some technicians and veterans of Haixing Power, to identify the new and old levels of old diesel engines, one question, two look, and three tests, and the main method is to determine the newness and old diesel engines. Question 1: I ask about the purchase time, purpose and reason for the diesel engine, the repair situation and what major parts have been replaced, and what problems are there in use, etc., so as to have a relatively comprehensive solution to the machine. Second look: First, check whether the model is an out-of-date model, then look at the new and old degree of the diesel engine from the appearance, check whether the parts are complete and whether there is any damage. Three tests: It is the test machine. The specific method of the diesel generator set is 1. Rotate the crankshaft and make the oil supply pump. If the injector makes a crisp sound of fuel injection, it means that the performance of the plunger pair and fuel injection nozzle is good; if there is no abnormal sound in the gear room, it means that the gear is not worn.