What is the purpose of a compression test in engine maintenance?

• A. To measure the temperature of the engine
• B. To evaluate the health of the engine's cylinders
• C. To check the fuel efficiency of the engine
• D. To assess the lubrication system of the engine

Answer: (B)

The purpose of a compression test in engine maintenance is to evaluate the health of the engine's cylinders. This test measures the pressure created within each cylinder when the engine is cranked. By assessing the compression levels, mechanics can determine how well the engine is sealing and functioning. Low compression readings may indicate potential issues such as worn piston rings, poorly sealing valves, or other internal engine problems that can affect performance and efficiency. Thus, a compression test serves as a critical diagnostic tool to identify underlying issues that may require further inspection or repair to maintain the engine in optimal condition.