The tool is mainly used to repair the conical sealing surface of the Bosch common rail injector valve cap and the steel ball. Conical abrasion is the most important reason for excessive oil return or insufficient rail pressure.

In combination with different types of valve cap, the tool is equipped with multiple sharpening heads and a variety of abrasive pastes. The grinding heads are made of imported alloy steel. The taper angle of the grinding head is completely matched with the valve cap cone surface, improved the grinding efficiency. The device is simple and convenient to use, put the valve cap that need to be repaired, placed in a fixed bracket, and the press cap is coated with grinding paste, then the grinding handle is pressed to do repair work.

With a Cummins grinding seat, the Cummins injector valve assembly can also be grinded.