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The main reason for the stuck nozzle of diesel generator set

Time : 2020-10-10 Hits : 6

1.The diesel is not clean, and there are impurities in the high-pressure oil pipe, which can cause the wear of the needle valve and the needle valve of the injector, and the needle valve and the needle valve are not closed tightly. In addition, the dirt on the injector pressure regulating spring, tappet and other parts is moved to the upper part of the injector needle valve through the injector tappet, or the cotton rope or lead wire used to prevent oil leakage on the oil line enters the spray nozzle through the high pressure oil pipe. The oiler will cause the needle valve assembly to jam.
2.The engine temperature is too high and the sprayer is not cooled well, and the valve assembly is stuck. However, too late fuel supply time, excessive scale or blockage of the cooling water channel, wear of the end face of the water pump impeller, and long-term overload of the engine will cause the engine to overheat.
3.The exhaust valve is worn, causing the fuel injector to drip when the fuel is stopped, so that the curved nozzle burns and deposits coke, resulting in a stuck fault.
4.The injection pressure is too low, causing the high-pressure gas in the combustion chamber to flow back;
5.When installing the fuel injector, the missing gasket or the gasket is damaged, causing air leakage, causing the local temperature of the fuel injector to be too high and blocking.
6. Reasons for parts manufacturing, such as tight fitting of the injector mounting hole on the cylinder head with the injector, too small clearance between the needle valve body and the mounting hole on the cylinder head, and the cylinder head injector mounting hole is processed too deep.