Discussion
Which is not a part of the valve operating mechanism?
Answer: D
The part that is not in the valve operating mechanism is the crank shaft.
The valve train of an overhead-valve engine is: camshaft and cams, tappets (cam followers), push rods, rocker arms, and the valves with their springs. The cam lifts the tappet, the push rod transmits the motion to the rocker arm, and the rocker arm opens the valve.
The crankshaft converts the reciprocating motion of the pistons into rotation. It drives the camshaft through timing gears or a chain, but it is part of the engine's main moving assembly, not of the valve mechanism itself.
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