Answer :
The correct answer is A. Feeler gauge.
A piston ring gap is the small gap left between the ends of a piston ring when installed in an engine cylinder. This gap is crucial because it allows for the expansion of the metal as the engine heats up, preventing the ring ends from touching and possibly causing damage to the engine.
Explanation:
Feeler Gauge:
- A feeler gauge is a tool used to measure gap widths or small distances between parts in mechanical devices. It consists of a series of thin metal strips or blades of varying thicknesses.
- When measuring piston ring gaps, a feeler gauge is slipped into the gap to check for the correct size, ensuring the piston rings will function properly within the engine's cylinder.
Other Options:
- Micrometer: Typically used to measure the thickness, outer diameter, or the thickness of parts, rather than gaps.
- Dial Indicator: Used to measure small distances or changes in position with higher precision, often related to alignment tasks.
Why Use a Feeler Gauge?:
- It is specifically designed for measuring small gaps or clearances in mechanical systems, making it ideal for tasks like measuring piston ring gaps.
- It provides accurate and reliable measurements crucial for ensuring the engine runs smoothly and efficiently.
