What does engine cylinder scoring mean?

[SanAndres]

Engine cylinder scoring refers to deep grooves being formed on the inner wall of the cylinder, causing the piston, piston rings, and cylinder wall to lose their sealing ability during friction. This results in reduced cylinder compression pressure and loss of power. The causes of engine cylinder scoring include: 1. Engine overheating due to coolant system leakage or insufficient coolant that is not replenished in time; 2. Insufficient engine oil, leading to loss of cylinder sealing and lubrication function; 3. Piston ring breakage, scratching the cylinder wall; 4. Piston pin retainer ring detachment, scratching the cylinder wall; 5. Piston rings getting stuck in the ring groove due to carbon deposits, losing their sealing effect; 6. Piston pin protrusion, scratching the cylinder wall; 7. Foreign objects entering the cylinder; 8. Insufficient clearance between the piston and cylinder wall.