referring now to the drawings and particularly to fig1 thereof , there is illustrated a cooling water pump for a cooling system of an internal combustion engine including a pump cover ( 1 ) attached by means of a fasteners ( not shown ) to pump housing ( 2 ) shown in broken lines . pump cover ( 1 ) has a generally cylindrical , elongated , axially outwardly directed projection ( 3 ) having axially spaced , internal bearing seats ( 4 , 5 ) to support roller bearings ( r ) which carry a drive shaft ( 6 ). a pump rotor ( 7 ), also shown in broken lines , is mounted on drive shaft ( 6 ) in pump chamber ( 8 ). the rotor ( 7 ) is rotatable by conventional means so that cooling water supplied through a feed channel ( 9 ) is conveyed by means of vanes ( 10 ) of pump rotor ( 7 ) into discharge channel ( 11 ). in the embodiment of the invention illustrated in fig1 the pump housing ( 2 ) is formed by a cylindrical flat - bottom recess in the body of the internal combustion engine and pump cover ( 1 ) is produced from relatively thick sheet metal . as best illustrated in fig1 the pump cover ( 1 ) includes a molded part ( 12 ) produced from an elastomeric material by injection molding which is vulcanized on the inside surface of the pump cover . the molded part ( 12 ) has a conical recess ( 13 ) which conforms to the shape of pump rotor ( 7 ) and is dimensioned to leave a narrow gap ( 14 ) for free rotational movement of pump rotor ( 7 ). as illustrated the molded part ( 12 ) also has a cylindrical outer cover contour ( 15 ) serving as a means for holding and guiding the part in the pump housing ( 2 ). molded part ( 12 ) is also designed to function as a seal between housing ( 2 ) and pump cover ( 1 ) via the action of the pressure exerted on the molded part by the screw joint . in accordance with another feature of the present invention , seal means are provided between the pump chamber ( 8 ) and the support for drive shaft ( 6 ) to prevent cooling liquids from migrating along the shaft ( 6 ) or tubular projection ( 3 ). this seal comprises a collar shaped extension ( 17 ) of the molded member ( 12 ) which fits into tubular projection ( 3 ) of pump cover ( 1 ) providing a lining on the seating surface for the sealing ring . the sealing ring thus can be inserted in a leak proof manner by taking advantage of the elasticity of molded member ( 12 ) and its projection ( 17 ). the output of the pump may be increased significantly by providing a wedge - shaped molded member ( 18 ) in the intermediate space between periphery of pump rotor ( 7 ) and the inside wall of pump housing ( 2 ) as best illustrated in fig2 . accordingly , its wide end ( 18a ) points in a direction opposite that which the liquid conveyed by pump rotor ( 7 ) is traveling . the resistance thus created in the flow path increases the deflection of cooling liquid into discharge channel ( 11 ) and in this manner increases overall pump output . the wedge shaped molded part ( 18 ), molded member ( 12 ), seal ( 16 ), and collar shaped extension ( 17 ) may be made of elastomeric material and integrally formed as a one piece unit . a modified embodiment of the present invention is illustrated in fig3 . in accordance with this embodiment , molded member ( 12 ) is made from metal , for example , by sintering , and has a series of inverted t - shaped projections ( 19 ) circumferentially spaced which extend through complementary recesses in pump cover ( 1 ). the projections are peened over on the outside surface of the pump cover ( 1 ) in the manner illustrated . the projections are generally elongated and project beyond the openings to facilitate peening and formation of a head to hold the molded part in place on the pump cover in the manner shown . to ensure a joint between the pump cover ( 1 ) and molded member ( 12 ) a disc like sealing insert is provided in a corresponding recess ( 12a ) in molded part ( 12 ). additionally , a circumferentially extending groove ( 12b ) is formed in the outer periphery of molded member ( 12 ) for receiving a housing seal ( 21 ) in the form of an o - ring which provides a liquid tight seal between the pump cover ( 1 ) and the molded member ( 12 ) and pump housing ( 2 ). a further modification of the present invention is illustrated in fig4 . in accordance with this embodiment , the molded member ( 12 ) is made of thermoplastic material by injection molding . in this fashion , the projections ( 19 ) can be injected into the recess in the pump cover and secured by formation of a head ( 19a ) on the outside surface of pump cover ( 1 ). the production of molded part ( 12 ) and its connection to pump cover ( 1 ) can thus be accomplished in a single step by positioning pump cover ( 1 ) in the mold used to produce the molded member ( 12 ). accordingly , when the mold is filled with thermoplastic material , the projections ( 19 ) automatically are formed in recesses ( 20 ) and likewise the head ( 19a ) are formed simultaneously . as illustrated , this embodiment also includes a housing seal ( 21 ) engageable in a peripheral groove of molded part ( 12 ). fig5 and 6 shows still another embodiment of the pump assembly in accordance with the present invention . in this instance the equivalent of the molded member comprises a web ( 18 ) made of sheet metal which is secured to pump cover ( 1 ) by suitable means such as adhesive , welding or other appropriate method . in accordance with this embodiment of the invention , the pump cover ( 1 ) is formed by a simple drawing process to conical shape conforming to the rear contour of the vane ( 10 ) of pump rotor ( 7 ). the web ( 18 ) is eccentric to the pump rotor ( 7 ) creating an intermediate space ( 23 ) between pump rotor ( 7 ) and the web which widens in the direction of rotation of the pump rotor ( 7 ). even though particular embodiments of the invention have be illustrated and described herein , changes and modifications may be made therein within the scope of the following claims .