Question 122Motor Plants - Assistant Engineer

The correct answer is D) facilitate valve removal for servicing. Valve cages are used on some large diesel engines to allow for easier removal and servicing of the engine's valves. The valve cage is a removable component that houses the valve, valve spring, and other associated parts. This design feature makes it simpler to access and replace the valves when needed, rather than having to disassemble the entire cylinder head. The other answer choices are incorrect because they do not accurately describe the primary purpose of valve cages. While they may provide some secondary benefits, the main function is to enable more convenient valve servicing, which is why option D is the correct answer.