What should a mechanic do if the piston rings bind on the block surface?

When piston rings bind on the block surface, checking the ring end gap is the appropriate action because the ring end gap is crucial for proper piston operation. The end gap refers to the space between the ends of the ring when it is installed in the cylinder. If this gap is too small, the rings can get stuck or bind as they expand upon heating during engine operation.

By checking and ensuring that the ring end gap is within the manufacturer's specifications, a mechanic can determine if the rings are properly sized for the cylinder. If the gap is insufficient, it might require filing the ends of the rings to create a larger gap, thereby allowing them to operate effectively without sticking. This proactive measure helps prevent engine damage and promotes optimal performance.

In contrast, replacing the block would generally be unnecessary and costly unless there are significant issues beyond just the binding of the rings. Using a different type of compressor may not address the underlying issue with the ring end gap and could lead to the same problem recurring. Similarly, adjusting the compressor size does not directly resolve a binding issue tied to ring end gaps, as it pertains to the installation process rather than addressing the root cause of the binding.