When a high pressure oil pipe of a cylinder is blocked due to deformation or impurities, Yang Zhong buys a diesel generator. After starting the engine, there may be a significant knock at the oil pipe part, and the engine power will decrease due to the failure of the cylinder to work normally.The inspection method is to loosen the inlet nut of the high-pressure oil pipe cylinder by cylinder. When the tapping sound disappears after loosening a certain cylinder, it can be concluded that the cylinder is a fault cylinder, and the fault can be eliminated after replacing the oil pipe.