ERIKC DLLA 152P 805 Denso common rail nozzle DLLA 146 P1655 denso diesel spray nozzle

FAQ: Common failures? Spring saddle stem recesses cause oil dilution

Failure performance: black smoke, mains red, low oil pressure, oil dilution.

ERIKC Answer: Failure analysis: The function of the spring saddle is to fix the pressure regulating spring and transfer the spring pressure. The upper part is under pressure by the pressure regulating spring and the lower part is under the high frequency impact of the needle valve opening. Due to material reasons, the hardness of the spring saddle is not enough, resulting in its lower The needle valve of the rod is quickly depressed under the high-frequency impact, and the depression of the spring saddle rod reduces the compression amount of the pressure regulating spring; it also reduces the downward pressure of the pressure regulating spring on the needle valve and reduces the opening pressure of the needle valve. The atomizer quality of the injector has a great influence. To make the fuel drop into the cylinder can not be fully burned, along the cylinder wall into the oil pan, mixed with the oil, resulting in oil dilution.

Treatment measures: (1) The quality of fuel injector spring saddle is often not noticed. The manufacturer must select the material and processing technology according to the design requirements. It is forbidden to shuffle well. At the same time, the depot should strictly control the feeding and must not be loaded. use. (2) The atomization test must be strictly controlled, and the reason why the atomizer with a degraded atomization quality is unknown must be ascertained.