Abstract: The invention relates to a component produced powder metallurgically in the form of a valve guide or a valve seat ring having an iron-based matrix containing a mineral solid lubricant, with the matrix having a density ranging between 75 and 90% of the theoretical density, and with the mineral solid lubricant having a melting point that lies below the sintering temperature of the matrix and the remaining pore volume of the matrix of the component being melt infiltrated with the solid lubricant.

Abstract: An injector with solenoid-valve control provided for diesel internal-combustion engines has a lateral fuel delivery conduit into a pressure accumulator reaching, on one hand, as far as the needle seat of a nozzle needle and on the other hand as far as a piston arranged on the rear side of the nozzle needle. A control space in the injector is connected by a controllable solenoid valve to the pressure accumulator or, for pressure relief, to a low-pressure conduit. A fuel filter is arranged in the pressure accumulator in the mouth region of the fuel delivery conduit.