What does an engine overhaul generally involve?

An engine overhaul generally involves disassembling and inspecting engine components. This process allows mechanics to assess the condition of various parts such as the pistons, crankshaft, and cylinder heads. During an overhaul, the engine is taken apart to clean internal parts, replace worn components, and ensure that everything is working together as it should. This thorough inspection is crucial as it helps identify any potential issues that could affect the engine's performance or longevity.

To clarify why the other options do not align with what an engine overhaul entails: replacing the battery simply addresses a different aspect of the vehicle's operation without engaging with the engine itself. Ignoring engine noise disregards significant indicators of underlying problems that may require an overhaul. Cleaning and polishing the exterior may enhance the visual appeal of the vehicle but does not contribute to the functionality or performance of the engine, which is the core focus of an overhaul. Thus, disassembling and inspecting engine components is fundamentally what defines an engine overhaul.