How to Inspect Injector Orifice Plate

How to Inspect Injector Orifice Plate

The Important of Injector Orifice Plate

The Damage of injector orifice plate can cause the failure working of an injector, therefor, the inpsection of the condition of injector orifice plate is very important. But how to inspect an injector orifice plate? Please follow these procedures.

How to Inspect Injector Orifice Plate

(1) Magnify 500 times under the microscope to check whether there is indentation on the sealing surface and the oil outlet hole of the orifice plate, check whether there is wear, scratch, damage, rust, depression, semicircle in the center hole of the orifice plate.

Orifice plate sealing surface inspection

Orifice plate oil back-flow hole inspection

Orifice plate center deviation inspection

There is indentation on the side, the orifice plate needs to be replaced

 There is indentation in the middle oil back-flow hole, the orifice plate needs to be replaced

 The middle oil back-flow hole is semicircular, the orifice plate needs to be replaced

  •  The blockage of the oil back-flow hole will cause small volume of the oil return, and the oil will not be injected.

  •  When oil back-flow hole becomes larger, it causes the semi ball to be not tightly sealed, which causes the fuel injection pressure cannot be established, then the fuel injector cannot work normally.

  •  The wear on orifice plate’s surface causes gap to the semi ball, which leads to large volume of oil return, in serious cases, the pressure can not be built up and nozzle will spray oil directly.

  •  The blockage of the oil inlet hole (side hole) will cause small amount of oil return, the blockage of oil inlet side hole will cause the injector cannot build a pressure chamber, as a result, the injector cannot work normally.

(2) Magnified 500 times under the microscope, check the plane position of the semi ball, if there is any scratch, it is recommended to replace it.

 

 

Semi ball’s surface inspection

Semi ball’s surface inspection

  

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