What is the primary reason for checking cylinder compression during inspections?

Checking cylinder compression during inspections is crucial for detecting internal engine wear. Compression is a key indicator of the engine's internal condition, specifically how well the cylinders are sealing. When there is wear, such as from piston rings losing their ability to seal properly against the cylinder walls, or when valves do not seat correctly, the compression will decrease. This loss can lead to a host of problems, including reduced engine power output, increased fuel consumption, and potential engine failure.

Monitoring cylinder compression allows for early identification of issues, enabling timely corrective actions to maintain engine performance and reliability. It is a fundamental part of maintaining the engine's overall health and ensuring that it operates efficiently.

While checking for proper fuel flow, verifying engine efficiency, and assessing engine temperature are important aspects of engine maintenance, these factors are often influenced by the underlying condition of the engine, which is directly reflected in its compression readings.