Q6. 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.
Q4. (a) Describe the different types of cams used in marine main engines. Explain their functions and how the cam profile affects the operation of exhaust valves, fuel pumps, and starting air systems. (10)
(b) What is a negative cam? Explain its purpose, constructional features, and where it is typically used in main engine. (6)
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