What does cylinder scuffing mean?

[VonOlivia]

Cylinder scuffing refers to an impact failure between the piston and cylinder liner in an internal combustion engine. The causes of cylinder scuffing include severe lack of lubricating oil, drastic changes in the thermal expansion coefficient of metal objects, excessive mechanical lubrication clearance between the piston and cylinder wall, poor quality of cylinder gaskets, insufficient surface flatness, improper driving habits, and long-term aggressive driving. Symptoms of cylinder scuffing: Engine powerlessness while driving, difficulty in acceleration, air leakage sounds at the joint between the cylinder head and cylinder block, one or two cylinders not working, bubbles emerging from the radiator water filler port, milky white engine oil when checking with the dipstick, and continuous water droplets flowing from the exhaust pipe. Solutions for engine cylinder scuffing: Use a cylinder pressure gauge to detect cylinder pressure and determine if the cylinder gasket is burnt. Remove the radiator cap and start the engine at medium speed, observing if bubbles emerge inside the radiator. If bubbles continuously emerge from the radiator water filler port, it indicates a burnt cylinder gasket. If the water surface fluctuation intensifies with increased engine speed and water sprays out, it means the area around the cylinder gasket's water passage is damaged. In this case, you can disconnect the ignition of each cylinder one by one to identify the non-working cylinder, remove the spark plug electrode to check for water droplets, and start the engine to observe if water or steam sprays out from the spark plug hole, thereby confirming whether the cylinder gasket is burnt. If the water level in the radiator drops rapidly and checking the dipstick reveals water in the engine oil (the oil appears yellow or even white), it indicates a leaking cylinder gasket. Additionally, if the coolant temperature in the radiator rises too quickly, frequently boils over, the water filler port splashes, and the inlet pipe shows no collapse, with no significant coolant consumption, it indicates air leakage from the cylinder gasket. In such cases, the cylinder gasket should be replaced.