What Causes Cylinder Scoring in Car Engines?
2 Answers
Cylinder scoring in car engines can be caused by: 1. Engine overheating due to coolant system leaks or insufficient coolant levels that are not replenished promptly; 2. Insufficient engine oil, leading to loss of cylinder sealing and lubrication functions; 3. Piston ring breakage scratching the cylinder wall; 4. Piston pin retaining ring detachment scratching the cylinder wall; 5. Piston rings getting stuck in grooves due to carbon buildup, losing sealing effectiveness; 6. Piston pin protrusion scratching the cylinder wall; 7. Foreign objects entering the cylinder; 8. Excessive tightness between piston and cylinder wall clearance. Solutions for cylinder scoring include: 1. Promptly replenishing engine coolant; 2. Adding engine oil; 3. Replacing piston rings and piston pin retaining rings.
I've been driving for 20 years and have experienced engine cylinder scoring. It happened after a long highway trip when the engine suddenly made sharp metallic noises. Inspection revealed severe scratches on the cylinder walls. The main cause was insufficient lubrication - I forgot to change the oil on time, causing it to degrade and thin out, reducing its protective properties. This led to direct friction between the pistons and cylinders, creating high-temperature damage. There were also cooling system issues with a clogged radiator causing engine temperatures to skyrocket. My usual neglect of the air filter, allowing too much dust intake, also accelerated the wear. After the scoring, the power dropped significantly, and the repair costs were shockingly high, nearly 10,000 yuan. Since then, I've strictly adhered to changing the oil every 5,000 kilometers, regularly checking coolant and filters. Now the car runs much smoother. I also avoid prolonged high-speed driving on steep slopes to prevent overloading.
