Question 140Motor Plants - Assistant Engineer

The correct answer is B) crankshaft counterweight. The crankshaft counterweight is a critical component of a diesel engine that helps to balance the rotational forces and vibrations generated by the engine's crankshaft. It is designed to counteract the imbalance caused by the movement of the crankshaft, pistons, and connecting rods, ensuring smoother engine operation and reduced stress on the engine components. The other options are incorrect because: A) A frequency tuner is not a component of a diesel engine. C) A frame stiffener is a structural component, not a specific engine part. D) The main bearing support assembly is a different component that supports the crankshaft bearings, not the crankshaft counterweight.