Injector needle valve and valve body with high precision, but there is always a small amount of diesel oil in the work under pressure from the needle valve with the back of the joint with the gap in the backward leakage (also known as back leakage), the return flow to the diesel filter This also acts as a lubricant and cooling element for the needle valve coupler. However, if the amount of return oil is too large, the amount of diesel injected into the cylinder will be significantly reduced. For this purpose, the following method can be used to check: Pull the handle to the corrector pressure is higher than the rated pressure of the injector by about ZMPa, observe the time required for the pressure to drop to the rated pressure, and 1015 is acceptable. If the time is too short, it indicates that the leakage after the injector is serious, that is, the amount of return oil is too large.

Pull the handle and spray atomize at a speed of 70 times per minute. The sprayed oil mist must not drip or splash. The cone angle in the direction of the mist beam should meet the specifications of the machine. The broken fuel must be crisp and crisp, accompanied by a clear sound. If not, check the needle hole of the needle valve for clogging or wear. If necessary, replace it with a new one.

Before installing the injector, remove the carbon deposit or dirt from the mounting hole of the cylinder head, wipe it with a dry cloth, and do not leak the copper gasket. After the injector is in place, tighten the injector tightening nut with the torque wrench according to the specified torque. Finally, install the high-pressure tubing and the return tubing.

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