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The task of the air filter is to filter the suspended particles in the air entering the cylinder to reduce the wear of the cylinder, piston and piston ring. Of the three media required for engine operation, air has the largest volume and comes from the atmosphere. If the air filter cannot effectively filter the suspended particles in the air, the lighter ones will accelerate the wear of the cylinder, piston and piston ring, and the heavier ones will cause the cylinder to strain and shorten the service life of the engine.

1. Misunderstanding

1. Don't ask about quality when buying

Since a small number of maintenance personnel did not realize the importance of the air filter, they only wanted cheap, not high quality, and as a result, an abnormality occurred shortly after the engine was installed. Especially when there are many fake and shoddy products in the current market, it is more important to shop around, select carefully, and always adhere to the principle of quality first.

2. Disassemble at will during use

The engine must use a scientifically proven air filter.

However, some drivers remove the air filter at will and let the engine work directly by inhaling unfiltered air. Truck air filter removal experiments show that after the air filter is removed, the wear of the engine cylinder will increase by 8 times, the wear of the piston will increase by 3 times, and the wear of the piston ring will increase by 9 times.

3. Maintenance and replacement do not proceed from reality

In the instruction manual of the air filter, although the mileage or working time is specified as maintenance or replacement data. But in fact, the maintenance and replacement cycle of the air filter is also related to environmental factors.

For cars that often drive in dusty environments, the maintenance or replacement cycle of the air filter should be shortened; for dusty cars, the maintenance or replacement cycle of the air filter is sufficient. Prolonged appropriately.

In actual work, many drivers and maintenance personnel act mechanically according to regulations and do not have a flexible grasp of different factors such as the environment. They insist on waiting for the mileage to reach the standard and the engine working condition is obviously abnormal before performing maintenance. It should be noted that if repairs are carried out at this time, not only the losses that have been caused cannot be recovered, but also greater harm will be caused. What's more, individual drivers don't even know that the air filter will fail and continue to use it as long as the appearance is not damaged.

2. Identification method

The working condition of the air filter and when it needs maintenance or replacement can be determined as follows:

In theory, the service life and maintenance interval of the air filter should be measured by the ratio of the gas flow through the filter element to the gas flow required by the engine. When the flow is greater than the flow, the filter works normally; when the flow is equal to the flow, the filter should be maintained; when the flow is less than the flow, the filter can no longer be used, otherwise the working conditions of the engine will deteriorate. The situation is getting worse and worse, and it is not even working properly.

In actual work, when the air filter element is blocked by suspended particles and cannot meet the airflow required by the engine, the engine will have abnormal working conditions, such as roaring, slow acceleration (insufficient intake air, insufficient cylinder pressure), and weak work (The mixture is too rich to cause incomplete combustion), the water temperature is high (combustion continues when entering the exhaust stroke), and the smoke becomes thicker when the exhaust accelerates. When these symptoms occur, it can be judged that the air filter is clogged, and the filter element should be removed for maintenance or replacement in time.

When maintaining the air filter element, pay attention to the color changes on the inner and outer surfaces of the filter element. After dust removal, the outer surface of the filter paper is clear and the inner surface is bright, and the filter element can continue to be used; if the outer surface of the filter paper loses its original color or the inner surface becomes dark, it must be replaced.