Abstract: The invention relates to a sealing unit for a fuel pressure sensor for sealing an at least virtually flat sealing joint between the sensor and a component that carries it via a screw connection, wherein a round sealing washer with a central bore is disposed between the threaded bolt-shaped end of the sensor housing with its central sensor bore and the bottom of the threaded bore of the component with its central pressure fluid opening. A pin is formed onto the threaded bolt-shaped end of the sensor housing, which pin centers the sealing washer, fixing it in a positive and/or frictional, non-positive manner, and rises above an end face that serves as a bearing surface for the sealing washer. The pin ends in an end face and has a length that is shorter than the thickness of the sealing washer. A sealing unit is produced that assures a reliable sealing function and permits a simple installation and disassembly of the sealing washer while reclaiming the sealing washer in a sealing position.

Abstract: A method and apparatus for measuring injection bores of fuel injection valves for internal combustion engines, in which the injection valve including the bores to be measured is fastened in a receiving device and the bore is measured with a measuring device. The ascertainment of the location and geometry of the bore to be measured is done by means of an optoelectronic measuring method such as a camera.

Abstract: A process for detecting the stroke motion of a body, which is displaceable in a housing, such as a valve member of an injection valve, by a measurement device disposed outside the housing, in which the stroke motion of the body is detected by means of an X-radiation penetrating the housing and detected by the measuring device.