1、 Main reasons for stuck fuel injection nozzle:

① 柴油不清潔，高壓油管內有雜質，力出寞了噴曲器針閥偶件的磨損，使針閥偶件關閉不嚴，燃燒室內高壓燃氣反竄，燒壞針閥偶件。此外，噴油器調壓彈簧、挺桿等 零件上的臟物通過噴油器挺桿移到了噴油器針閥上部，或油路上用于防止漏油的棉繩、鉛絲經高壓油管進入噴油器，都會使針閥偶件卡死。

① The diesel oil is not clean, and there are impurities in the high-pressure oil pipe, which causes the wear of the needle valve coupling parts of the injector, so that the needle valve coupling parts are not tightly closed, the high-pressure gas in the combustion chamber moves back, and the needle valve coupling parts are burned out. In addition, the dirt on the fuel injector pressure regulating spring, tappet and other parts will be moved to the upper part of the fuel injector needle valve through the fuel injector tappet, or the cotton rope and lead wire used to prevent oil leakage on the oil circuit will enter the fuel injector through the high-pressure oil pipe, which will block the needle valve coupling.

②機溫過高噴曲器冷卻不良，造虎地閥偶件卡死。而供油時間過遲、冷卻水道水垢過多或堵塞、水泵葉輪端面磨損、發動機長期超負荷等又會使發動機過熱。

② The machine temperature is too high, the cooling of the curve spinner is poor, and the tiger making valve coupling is stuck. The engine will overheat if the oil supply time is too late, the cooling water channel is too dirty or blocked, the end face of the water pump impeller is worn, and the engine is overloaded for a long time.

③出抽閥磨損，使噴油器停止噴油時出現滴油現象，以致使噴曲嘴燃焦積炭，發生卡死的故障。

③ The exhaust valve is worn, which causes the fuel injector to drip when stopping fuel injection, resulting in coke and carbon deposition at the nozzle and jamming.

④噴曲壓力過低，造成燃燒室內高壓燃氣反竄；

④ The injection pressure is too low, resulting in the reverse channeling of high-pressure gas in the combustion chamber;

⑤噴油器安裝時，漏裝墊片或墊片破壞，造成漏氣，引起噴油器局部溫度過高而卡死。

⑤ When the fuel injector is installed, the gasket is missing or damaged, resulting in air leakage, causing the local temperature of the fuel injector to be too high and stuck.

⑥零件制造方面的原因，如氣缸蓋上噴油器安裝孔與噴油器配合過緊，針閥體與氣缸蓋上的安裝孔間隙過小，氣缸蓋噴油器安裝孔加工過深等。

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

二、噴油嘴卡死的修理方法：

2、 Repair method for stuck fuel injection nozzle:

先 將卡死的噴油嘴放入柴油或機油內加溫，然后取出用布包住，再用手鉗夾緊針閥并慢慢活動，將針閥從針閥體內取出。將少量清潔機油滴在針閥體內，使針閥在針閥 體內反復活動，直至針閥能在針閥體內活動自如。如針閥的密封面有燒傷的痕跡，應當用研磨膏進行研磨。研磨時要注意掌握研磨膏用量和研磨時間。將清洗干凈的 鐘閥偶件裝上噴油器，并調整好噴油壓力后即可重新使用。

First put the stuck fuel injection nozzle into diesel or engine oil for heating, then take it out and wrap it with cloth, then clamp the needle valve with pliers and move it slowly, and take the needle valve out of the needle valve body. Drop a small amount of clean engine oil into the needle valve body to make the needle valve move repeatedly in the needle valve body until the needle valve can move freely in the needle valve body. If there are burn marks on the sealing surface of the needle valve, grind it with grinding paste. When grinding, pay attention to the amount of grinding paste and grinding time. Install the cleaned bell valve coupling on the fuel injector and adjust the injection pressure before reuse.

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