Analysis of the causes of cylinder liner wear The working environment of cylinder liners is very harsh, and there are many reasons for wear. Normal wear is usually allowed due to structural reasons, but improper use and maintenance will cause abnormal wear.

1. Analysis of the causes of cylinder liner wear

1. Long-term low-temperature operation. Long-term low-temperature operation will cause poor combustion, and carbon deposits will spread from the upper part of the cylinder liner, causing serious abrasive wear on the upper part of the cylinder liner; secondly, it will cause electrochemical corrosion.

2. The upper part bears high pressure, so that the cylinder wears up and down lightly. The piston ring is pressed tightly on the cylinder wall under the action of its own elastic force 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 will increase. In the work stroke, as the piston descends, the positive pressure gradually decreases, so the cylinder wears up and down.

3. Into the mechanical impurities, aggravate the abrasion of the middle of the cylinder. Dust in the air, impurities in the lubricating oil, etc., enter between the piston and the cylinder wall and cause abrasive wear. When dust or impurities move back and forth with the piston in the cylinder, since the movement speed in the middle of the cylinder is the highest, the wear in the middle of the cylinder is aggravated.

4. The filtering effect of the lubricating oil filter is poor. If the lubricating oil filter does not work properly, the lubricating oil cannot be effectively filtered, and the lubricating oil containing a large amount of hard particles will inevitably aggravate the wear of the cylinder liner.

5. The air filter has low filtration efficiency. The function of the air filter is to remove the dust and sand contained in the air entering the cylinder to reduce the wear of the cylinder, piston, piston ring and other parts. Experiments show that if the engine is not equipped with an air filter, the wear of the cylinder will increase by 6-8 times. The air filter cannot be cleaned and maintained for a long time, and the filtering effect is poor, which will accelerate the wear of the cylinder liner.

6. Poor lubrication conditions cause serious wear on the upper part of the cylinder liner. The upper part of the cylinder liner is adjacent to the combustion chamber, the temperature is very high, and the lubrication condition is poor. The flushing and dilution of fresh air and unevaporated fuel aggravate the deterioration of the upper conditions, making the cylinders in a state of dry friction or semi-dry friction, which is the cause of serious wear on the upper part of the cylinder.

Correct selection of lubricating oil The lubricating oil with the best viscosity value should be selected strictly according to the season and engine performance requirements. Inferior lubricating oil should not be purchased at will, and the quantity and quality of the lubricating oil should be checked and maintained frequently. Strengthening the maintenance of the filter Keeping the air filter, oil filter and fuel filter in good working condition is essential to reducing the wear of the cylinder liner. These methods can effectively maintain the engine cylinder liner.