Causes of nozzle blockage

1, dirty diesel oil and impurities in the high-pressure oil pipe lead to the needle valve coupling not being closed tightly, and the high-pressure gas in the combustion chamber flows backwards, which burns the needle valve coupling. In addition, the dirt on the pressure regulating spring and tappet of the injector moves to the upper part of the needle valve of the injector through the tappet of the injector, or the cotton rope and lead wire used to prevent oil leakage on the oil path enter the injector through the high-pressure oil pipe, which will make the needle valve couple stuck.

2. The temperature of the machine is too high, and the fuel injector is poorly cooled, which causes the coupling of the oil outlet valve to be stuck. However, too late oil supply time, too much scale or blockage in the cooling channel, wear of the end face of the water pump impeller and long-term overload of the engine will overheat the engine.

3. Wear of the oil outlet valve leads to oil dripping when the fuel injector stops spraying, which causes the fuel injector to burn and deposit carbon, leading to jamming failure.

4. When installing the fuel injector, the gasket is missing or damaged, resulting in air leakage, causing the local temperature of the fuel injector to be too high and stuck.

5, the injection pressure is too low, resulting in high pressure gas channeling in the combustion chamber;

6. Manufacturing reasons of parts, such as too tight fit between the injector mounting hole on the cylinder head and the injector, too small clearance between the needle valve body and the mounting hole on the cylinder head, too deep machining of the injector mounting hole on the cylinder head, etc.