Abstract: A grinding head for machining the internal surface of a ring member includes a rotary grinding wheel which is coupled to a detector roll which can be moved about the internal surface of a master ring. The detector roll is tapered so that as the grinding wheel wears the detector roll can be moved axially to adjust its effective diameter to correspond to the diameter of the grinding wheel.

Abstract: A fuel injection pump includes a cam which is movable to vary the timing of delivery of fuel by the injection pump. The cam is acted upon by a first piston which is subjected to the outlet pressure of a supply pump the piston acting on the cam to advance the timing of delivery of fuel. A second piston is provided which is subjected to the outlet pressure of the feed pump only when the engine speed attains a predetermined value. The first piston can move the cam against the action of a first light spring and a second relatively strong spring, the second spring being prestressed and being accommodated in the second piston.

Abstract: A fuel injection pump for supplying fuel to an internal combustion engine includes a pair of pumping plungers which are actuated by cam lobes formed on the internal periphery of an annular cam ring. Roller carrying shoes are interposed between the plungers and the cam lobes and are axially movable. The cam profile varies throughout its axial length so that variation in the axial setting of the shoes varies the amount of fuel supplied by the pump.