Abstract: A variable displacement pump, the delivery of which is controlled through the medium of a toothed rack meshing with a pinion through which the piston of the pump is adapted to slide axially, said piston being adapted to rotate jointly with said pinion and to move in translation jointly with pump actuation means, and the toothed rack meshing with an auxiliary shaft pinion the angular position of which is located by an indicating needle, thus ensuring a measurement of the delivery of said pump.

Abstract: A balanced multiple-throw crank-shaft wherein the free forces of the first and second orders forming resultants for the whole crank-shaft of the forces produced by each coupling are substantially zero and at least some of the crank-throws are shifted or offset angularly, respectively, by such a small angle in one direction of rotation and by such an amount relative to the corresponding circumferentially uniformly distributed angular positions they would assume in a configuration with angularly equally spaced crank-throws in orthogonal projection on a plane perpendicular to the geometrical spin axis of rotation of said crank-shaft that an improved balancing ratio will result therefrom.

Abstract: A method of and means for conditioning a substantially highly supercharged, low-compression ratio Diesel engine at start and low-load or idling speed operation wherein the improvement consists in the step of temporarily preheating the air supply before it enters or is pressure fed into the combustion chambers of the engine cylinders.

Abstract: An erosion-preventing device in a jerk-pump of the kind comprising a cylindrical plunger reciprocating longitudinally within a bore formed in a barrel mounted in the pump housing and including a common feed and by-pass duct opening into said bore, said erosion preventing device being constituted by a wall portion, inserted longitudinally into said common duct and consisting of a partition having the shape of a flat plate or strip and inserted into said common duct.

Abstract: An overhead valve chest for an internal combustion engine with a cylindroconical portion adjacent to the bottom seating of the chest within the cylinder-head and comprising a sealing ring overlapping said cylindro-conical portion and mounted in a groove the diameter of the flat horizontal top wall of which adjacent to the conical portion of said chest is larger than that of the lower wall opposite to the cylindrical wall of said chest, said ring being in continuous bearing engagement with its ends inside of said groove.

Abstract: Method for removing a valve mounted in an internal combustion engine cylinder-head, and valve actuating device allowing to carry out said method which comprises the steps of increasing the clearance between the valve rod and the corresponding end of its rocker arm, shifting laterally the corresponding push-rod for allowing the end of the rocker arm to be withdrawn from the removal path of the valve, and removing the valve upwardly.

Abstract: Method and device for cleaning an exhaust gas-driven power turbine of a supercharging set of an internal combustion engine, wherein washing liquid under pressure is fed during the washing periods into injection nozzles fitted onto the inlet ducts for exhaust gases on said turbine and a compressed gas is fed into said injection nozzles outside of the washing periods.

Abstract: Exhaust valve for an internal combustion engine, of the type cooled by fluid circulation and comprising a valve head and a stem screwed into the said head. Said exhaust valve comprises intake and return ducts for the cooling liquid, which are parallel and open into a chamber in the valve head, and which are external relative to one another and substantially symmetrical with respect to the longitudinal axis of the said stem.