How to Inspect Piston Rings During Engine Repair?
2 Answers
After forcibly closing the free gap of the ring and then releasing it, the plastic deformation should not exceed 10% of the original free gap, indicating that the elasticity of the piston ring is qualified. Compare the free gap of the new and old rings. If the free gap of the old ring is smaller, it indicates plastic deformation and reduced elasticity.
When inspecting piston rings during engine repair, my common method is to first perform a compression test to check the sealing of each cylinder. If the pressure is too low, I suspect there may be an issue with the rings. Then, I disassemble the piston to observe whether the rings show signs of cracks, wear, or breakage. Using a specialized ring gauge, I measure the end gap and side clearance. If the clearance exceeds 0.5 mm, it indicates excessive wear and the need for replacement. At the same time, I check if the ring grooves are clean to avoid carbon buildup affecting tension. I also monitor the oil consumption, as excessive oil burning is often a sign of ring failure. This inspection process requires professional knowledge, so I recommend leaving it to a professional repair shop to avoid misjudgment or damage to other components. Don’t forget to inspect the cylinder wall for wear. If the scratches are severe, replacing the rings won’t help, and you may need to consider an engine overhaul to ensure performance restoration and safe driving.
