What are the causes of engine cylinder scoring?
2 Answers
Causes of engine cylinder scoring: 1. The engine coolant temperature is too high, causing a lack of coolant in the cooling system, which prevents the cooling water from circulating and dissipating heat, leading to excessive engine temperature; 2. Poor operation of the engine lubrication system; 3. Poor operation of the engine fuel supply system leading to cylinder scoring. A vehicle with cylinder scoring requires an engine overhaul, commonly referred to as cylinder boring, and all piston rings must be replaced. Symptoms of cylinder scoring include: 1. Due to substandard piston quality or excessively high operating temperature, the piston deforms and rubs against the cylinder wall, causing scratches on the cylinder wall, resulting in poor sealing and power loss; 2. In severe cases, bluish smoke may be emitted.
A friend's car recently suffered from cylinder scoring, and after towing it to the repair shop, it turned out to be a fairly common issue. Simply put, cylinder scoring occurs when the piston scratches the cylinder wall, and there are several main causes. Oil-related issues are the most common, such as insufficient oil or the use of low-quality oil, leading to poor lubrication and direct metal friction. High temperatures are another culprit; if the cooling system fails and the water temperature soars, the piston expands and gets stuck against the cylinder wall. Excessive carbon buildup can also cause problems, as carbon deposits in the combustion chamber create hot spots that erode the cylinder wall. Severe wear on the piston rings can lead to loss of sealing, resulting in poor fuel-air mixture and increased friction. Additionally, prolonged low-speed operation or frequent overloading of the engine can accelerate wear. Repairs aren't cheap, so it's important to regularly check the oil condition and monitor the temperature gauge.
