Why is it important to measure the end gap of piston rings correctly?

Measuring the end gap of piston rings correctly is crucial primarily to prevent excessive wear and overheating of the engine. The end gap is the space between the ends of the piston rings when they are installed in the cylinder. If the end gap is too small, it can lead to the rings not being able to expand as the engine heats up, resulting in distortion, potential breakage, or seizing. This can prevent the piston from moving freely within the cylinder, leading to increased friction, excessive wear on both the piston and cylinder walls, and, ultimately, overheating of the engine components.

Moreover, an appropriately sized end gap allows for the proper sealing of combustion gases while still enabling the thermal expansion of the rings. This balance is essential for optimal engine performance and longevity. Ensuring that the end gap is within the manufacturer's specified limits contributes directly to maintaining engine efficiency and reliability.