An actuating device for hydraulically securing a camshaft of an engine of a motor vehicle in a start position has a solenoid valve controlling the flow of a pressure medium to a camshaft adjuster with a rotary slide valve that is fixedly connected to the camshaft and moves the camshaft into the required start position according to the pressure medium supplied to it by the solenoid valve. According to the invention, an injection valve member, which opens or closes at least one injection opening, is controlled by a control valve. A drive shaft passes through the center openings of the turbine discs and is attached to the three or more turbine discs, wherein the drive shaft is positioned within the case along the centerline, free to rotate within the case, and extends through the case for connection to a generator. The first adjustable screw pushes forward the integration rod, so that the first spring is compressed. Apparatus for carrying out the method is also described.