Cause Analysis of Cylinder Liner Wear

The working environment of the cylinder liner is very bad, and there are many reasons for wear. Normally, normal wear is allowed due to the structure, but improper use and maintenance will cause abnormal wear.

1) The upper part of the cylinder liner is severely worn due to poor lubrication conditions. The upper part of the cylinder liner is adjacent to the combustion chamber, with high temperature and poor lubrication conditions. The washing and dilution of fresh air and non evaporated fuel aggravate the deterioration of the upper conditions, making the cylinders in a dry or semi dry friction state, which is the cause of severe wear on the upper part of the cylinder.

2) The pressure on the upper part is large, which makes the cylinder wear more heavy than light. The piston ring is tightly pressed on the cylinder wall under the action of its own elasticity and back pressure. The greater the positive pressure, the more difficult it is to form and maintain the lubricating oil film, and the mechanical wear is aggravated. During the power stroke, as the piston moves downward, the positive pressure gradually decreases, so the cylinder wear is heavy on the top and light on the bottom.

3) Mineral acid and organic acid cause the cylinder surface to be corroded and peeled off. After the combustion of the combustible mixture in the cylinder, water vapor and acid oxides will be generated. They will dissolve in water and generate mineral acids. In addition, the organic acids generated during combustion will corrode the cylinder surface. The corrosives will be gradually scraped off by the piston ring during friction, causing deformation of the cylinder liner.

4) The mechanical impurities enter the cylinder, which aggravates the wear in the middle of the cylinder. The dust in the air and impurities in the lubricating oil enter between the piston and the cylinder wall, causing abrasive wear. When dust or impurities move back and forth with the piston in the cylinder, due to the maximum speed in the middle of the cylinder, the wear in the middle of the cylinder is aggravated.