喷油嘴针阀卡死是柴油机常见的故障。去年本刊第五期机务园地上发表的《如何判断喷油嘴针阀卡死》一文。曾介绍过在发动机上进行不拆卸检查的一种方法。但根据喷油嘴的不同结构,对某些机型(如东方红—40拖拉机)的喷油嘴,还可以用另外更简便、直接的方法,进行不拆卸检查。由喷油嘴工作过程可知,喷油嘴正常工作时,针阀在针阀体内应该急促而有力地上下移动的。因90、 Valve needle stuck is a common diesel engine failure. Last year, published in the fifth issue of Machine Park on the ground, “How to determine the needle stuck needle” article. A method of performing a non-disassembly inspection on the engine has been introduced. But according to the different structure of the nozzle, for some models (such as the Dongfanghong-40 tractor) nozzle, you can also use a more simple, direct method, without disassembly inspection. Working process by the nozzle shows that the normal operation of the nozzle, the needle valve in the body should be rapid and forcefully move up and down. Due to 90,