How to Replace Piston Rings?
1 Answers
When replacing piston rings in a worn cylinder liner, in addition to checking and correcting the ring end gap, side clearance, elasticity, and leakage rate, the following detailed steps should be followed: 1. Select piston rings that match the repair dimensions of the cylinder and piston. If the exact size is unavailable, rings one size larger than the original may be used to ensure good contact between the rings and the cylinder wall. Alternatively, the old top compression ring can be moved to the first groove, and the new rings can be installed in the lower grooves to prevent poor contact and leakage of oil and gas. 2. Correct the wear shoulder at the top of the cylinder. Use a scraper to remove the shoulder, working from the inside out to avoid damaging the cylinder wall. Metal shavings must be carefully handled and not allowed to fall into the crankcase. Failure to correct the wear shoulder can cause the new rings to impact the shoulder during operation, leading to ring fracture, groove damage, or even cylinder scoring. 3. The end gap of the new rings should be filed based on the cylinder position when the piston is at bottom dead center. Importantly, do not use the maximum wear area at the cylinder's upper shoulder as the reference for determining the end gaps of the rings.
