What is Engine Cylinder Scoring?
1 Answers
Engine cylinder scoring refers to the phenomenon where the piston and piston rings, during their reciprocating motion within the cylinder, forcibly scrape and create noticeable scratches and grooves on the cylinder wall due to poor lubrication or excessively small clearance between components. Below is an introduction to engine cylinder scoring: 1. Symptoms and sounds of engine cylinder scoring: (1) The engine temperature rises, the RPM becomes unstable, there are signs of stalling, and a "clicking" sound is emitted simultaneously. (2) When the engine experiences cylinder scoring, the main symptoms while driving include weak acceleration and abnormal jerking. 2. Causes of engine cylinder scoring: (1) Overheating engine: Overheating is one of the most common causes of cylinder scoring. When the engine temperature is too high, it disrupts the balance of clearance between the piston, piston rings, and cylinder, leading to cylinder scoring. In severe cases, it may even cause the piston to seize directly within the cylinder. (2) Poor oil lubrication: Generally, engine cylinders are lubricated through splash lubrication, and some engines may also be equipped with dedicated cylinder lubrication injectors. If the oil level is too low, the injector is clogged, or the oil pressure is too low, it is highly likely to result in cylinder scoring. (3) Carbon buildup issue: When carbon deposits accumulated in the cylinder fall into the gap between the piston and cylinder, the reciprocating motion of the piston can forcibly cause scratches and marks on the cylinder wall.
