Farmers who have used diesel generators generally know that the nozzle is one of the three pairs of precision components in the diesel fuel supply system. Its normal service life is over 1,000 hours. But due to improper use, often use hundreds of hours, even dozens of hours on the wear and tear card.
One, the main reasons for nozzle stuck:
1, diesel oil is not clean, there are impurities in the high-pressure oil pipe, so that the needle valve coupling is not strictly closed, the high-pressure gas in the combustion chamber is channeling back, and the needle valve coupling is burned out. In addition, the injector pressure regulating spring, tappet and other parts of the dirty things through the injector tappet moved to the upper part of the injector needle valve, or on the oil road to prevent oil leakage of cotton rope, lead wire through the high pressure tubing into the injector, will make the needle valve parts stuck.
2, the machine temperature is too high, the injector cooling is not good, resulting in the needle valve parts stuck. But the oil supply time is too late, the cooling channel scale is too much or blocked, the pump impeller end face wear, the engine long-term overload and so on will make the engine overheat.
3, the oil valve wear, so that the fuel injector stops the phenomenon of dripping oil, resulting in the nozzle burning coke carbon, stuck fault.
4. When the injector is installed, the gasket or gasket is damaged, resulting in air leakage, causing the local temperature of the injector to be too high and stuck.
5, injection pressure is too low, resulting in high pressure gas backchanneling in the combustion chamber;
6, parts manufacturing reasons, such as cylinder head injector installation hole and injector match too tight, needle valve body and cylinder head on the installation hole gap is too small, cylinder head injector installation hole processing is too deep.
Two, the nozzle stuck repair method: the first stuck nozzle into diesel or oil heating, and then remove with cloth wrapped, and then hand pliers clamp needle valve and slowly activity, the needle valve from the needle valve body out. Drop a small amount of clean oil in the needle body, so that the needle valve in the needle body repeated activities, until the needle valve can move freely in the needle body. If there are burn marks on the sealing surface of the needle valve, it should be ground with grinding paste. When grinding, pay attention to the amount of grinding paste and grinding time. Clean the needle valve parts on the injector, and adjust the injection pressure can be reused.