What Causes the Failure of the Left and Right Cylinder Intake Function in Mercedes-Benz?

[VanArabella]

Cylinder wear is the cause. The reasons for wear are as follows: 1. Mechanical Wear: When the piston is at top dead center, the high-temperature combustion gas generates maximum pressure, increasing the piston ring's normal force against the cylinder wall and friction. This destroys the lubricating oil film, causing the most severe wear on the cylinder wall corresponding to the first piston ring. 2. Corrosive Wear: Organic acids and acidic oxides (which dissolve in water to form mineral acids) produced by the combustion of the air-fuel mixture corrode the cylinder surface, leading to corrosive wear. The upper part of the cylinder block is not fully covered by the lubricating oil film, making corrosion more severe. 3. Abrasive Wear: Dust from the air, mechanical impurities in the lubricating oil, and engine wear debris enter between the cylinder walls, causing abrasive wear. Dust from the air is drawn into the upper part of the cylinder, and its sharp edges cause the most wear in this area. The drum-shaped wear pattern is due to the piston moving fastest in the middle of the cylinder, where abrasive wear is most severe, especially in areas with heavy sand and dust.