(a) For a large slow speed direct reversing engine, describe in detail the profile of a cam suitable for fuel pump operation in either the ahead or astern mode

(b) With respect to cam material, describe the heat treatment employed during manufacture

(c) Explain how the position of the cam relative to the crankshaft is altered when changing from ahead to astern running

(d) State how the position of the cam would be correctly set if it were replaced.