Farmer friends who used diesel generators generally know that the nozzle is one of the three pairs of precision parts of the diesel fuel supply system. Its normal life in one thousand hours. But due to improper use, often use hundreds of hours, or even tens of hours to wear stuck.
First, the main reason for fuel nozzle stuck:
1, diesel is not clean, there are impurities in the high-pressure tubing, so that the needle valve closed lazy, burning high-pressure gas inside the channel, burned needle valve even. In addition, the fuel injector pressure spring, tappet and other parts of the dirt through the injector tappet moved to the upper part of the injector needle valve, or oil used to prevent oil spills, lead wire through the high pressure tubing into the spray Oil device, will make the needle stuck even broken.
2, the machine temperature is too high fuel injector poor cooling, resulting in the valve even stuck. And the oil supply time is too late, too much or no clogging the cooling water pipe, pump impeller end wear, long-term overload of the engine and so will make the engine overheating.
3, the oil valve wear, so that the injector to stop the phenomenon of oil when the oil drip, so that the fuel nozzle burning coke, the occurrence of stuck failure.
4, the injector installation, leakage of gasket or gasket damage, resulting in leakage, causing the fuel injector local temperature is too high and stuck.
5, fuel injection pressure is too low, resulting in high-pressure combustion chamber gas channeling;
6, parts manufacturing reasons, such as the cylinder head on the injector mounting hole and the injector with too tight, the needle body and the cylinder head on the mounting hole clearance is too small, the cylinder head injector installation hole processing too deep The
Second, the fuel injector stuck repair method: first stuck the nozzle into the diesel or oil heating, and then remove the cloth wrapped, and then clamp the needle and slowly move the needle, the needle The valve is removed from the needle valve. Will be a small amount of cleaning machine oil droplets in the needle valve body, so that the needle valve in the needle body repeated activities, until the needle valve in the needle valve body freely. If the sealing surface of the needle valve has burns, it should be ground with grinding paste. Grinding should pay attention to grasp the amount of grinding paste and grinding time. Will clean the bell valve even install the fuel injector, and adjust the fuel injection pressure can be reused.