Diesel engine fuel injector is one of the three pairs of diesel engine fuel supply system. Its normal service life is more than one thousand hours. However, due to improper use, often use hundreds of hours, or even tens of hours on the wear card.
First, the main reason for the fuel injector stuck:
① 柴油不清洁，高压油管内有杂质，力出寞了喷曲器针阀偶件的磨损，使针阀偶件关闭不严，燃烧室内高压燃气反窜，烧坏针阀偶件。此外，喷油器调压弹簧、挺杆等 零件上的脏物通过喷油器挺杆移到了喷油器针阀上部，或油路上用于防止漏油的棉绳、铅丝经高压油管进入喷油器，都会使针阀偶件卡死。
The diesel is not clean, high pressure tubing has impurities, force out Mo wear curved spray nozzle, the needle valve is not tightly closed, the combustion chamber pressure gas anti channeling needle valve, burn. In addition, the injector pressure regulating spring, tappet parts such as on the dirt through the injector tappet moved to the upper part of the injector, or the oil used for cotton rope, to prevent leakage of the wire by high pressure oil into the injector, will make the needle valve stuck.
The engine temperature is too high, the cooling of the spray device is bad, so the valve parts of the tiger are stuck. The oil too late, cooling too much scale or blockage of the pump impeller and seal wear, long-term engine overload etc. will make the engine overheating.
The pumping out valve wear, the injector drop of oil injection stop phenomenon, so that the spray mouth curved coke burning coke, stuck fault.
The curved injection pressure is too low, resulting in high pressure gas reverse flow combustion chamber;
The installation of the injector, leakage or gasket gasket damage caused by leakage, caused by the local temperature is too high and the death card injector.
The parts manufacturing reasons, such as cylinder head, the fuel injector with the tight hole and the fuel injector installation hole clearance on the cover of the needle valve body and the cylinder is too small, the cylinder cover and the fuel injector hole deep processing etc.
Two, the repair method of fuel injection nozzle:
先将卡死的喷油嘴放入柴油或机油内加温，然后取出用布包住，再用手钳夹紧针阀并慢慢活动，将针阀从针阀体内取出。将少量清洁机油滴在针阀体内，使针阀在针阀 体内反复活动，直至针阀能在针阀体内活动自如。如针阀的密封面有烧伤的痕迹，应当用研磨膏进行研磨。研磨时要注意掌握研磨膏用量和研磨时间。将清洗干净的 钟阀偶件装上喷油器，并调整好喷油压力后即可重新使用。
The first nozzle will be stuck into diesel or oil heating, and then remove the cloth, and then the clamping pliers needle and slowly remove the needle from the needle, in vivo. A small amount of clean oil droplets in the valve body, the valve body of the needle repeatedly until the needle in the activities, activities of the needle body freely. As the needle valve sealing surface burns, should be abrasive grinding paste. Grinding should pay attention to grasp the amount of grinding paste and grinding time. The cleaning of the bell valve pieces attached to the injector, and adjust the injection pressure can be re used.
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