If the ring end gap measures 0.045" and the reject size is 0.035", what should be done with the rings?

The measurement of the ring end gap is critical in small engine mechanics, as it directly affects the engine's performance and longevity. The specifications indicate that the optimal end gap for the rings should not exceed the reject size limit of 0.035 inches.

In this case, a ring end gap of 0.045 inches is greater than the reject size. This indicates that the rings are worn beyond acceptable tolerances, which can lead to problems such as increased blow-by, reduced compression, and overall decreased engine efficiency. Since the measurement exceeds the reject size, it is necessary to replace the rings to ensure proper sealing and functionality of the engine.

This approach helps maintain the engine's integrity and performance, as worn rings can lead to further engine damage or failure if left in service. Therefore, the correct course of action is to replace the rings, ensuring the engine operates optimally.