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Misunderstandings and Identification Methods of Air Filters

The function of the air filter is to filter out the suspended particles in the air entering the cylinder to reduce the wear of the cylinder, piston and piston ring. Among the three media required for engine operation, the air consumption is the largest. If the air filter cannot effectively filter the suspended particles in the air, it will accelerate the wear of the cylinder, piston and piston ring, and cause the cylinder to be strained and shorten the service life of the engine.

Mistakes in use ① Do not seek quality when purchasing. Because a small number of maintenance personnel did not recognize the importance of the air filter, they only wanted cheap, not quality, and bought inferior products, so that the engine worked abnormally soon after installation. Compared to the money saved by buying a fake air filter, the price of repairing the engine is much more expensive. Therefore, when buying air filters, you should adhere to the principle of quality first, especially when there are many fake and shoddy products in the current auto parts market, you should shop around and choose carefully.

②Remove at will. Some drivers remove the air filter at will so that the engine can directly inhale unfiltered air in order to make the engine obtain sufficient performance. The dangers of this approach are obvious. The test of dismantling the air filter of the truck shows that after removing the air filter, 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 live cold ring will increase by 9 times. times.

③Maintenance and replacement are not based on reality. In the air filter instruction manual, although it is stipulated that the mileage or working hours are used as the basis for maintenance or replacement. But in fact, the maintenance or replacement cycle of the air filter is also closely related to the environmental factors of the vehicle. For cars that often drive in an environment with high dust content in the air, the maintenance or replacement cycle of the air filter should be shorter; for cars driving in an environment with low dust content, the maintenance or replacement of the air filter should be The period can be appropriately extended. For example, in actual work, the drivers mechanically act according to the regulations, instead of flexibly grasping the environment and other factors, and they have to wait until the mileage reaches the standard and the engine working state is obviously abnormal before maintenance. This will not only save the vehicle maintenance expenses. , it will also cause greater waste, and will also cause serious harm to the performance of the vehicle.

Identification method How is the working condition of the air filter? When does it need to be maintained or replaced?

In theory, the service life and maintenance interval of the air filter should be measured by the ratio of the gas flow rate flowing through the filter element to the gas flow rate required by the engine: when the flow rate is greater than the flow rate, the filter works normally; when the flow rate is equal to When the flow rate is lower than the flow rate, the filter should be maintained; when the flow rate is less than the flow rate, the filter can no longer be used, otherwise the working condition of the engine will get worse and worse, or even unable to work. In actual work, it can be identified according to the following methods: when the filter element of the air filter is blocked by suspended particles and cannot meet the air flow required for the engine to work, the working state of the engine will be abnormal, such as a dull roaring sound, and acceleration. Slow (insufficient air intake and insufficient cylinder pressure), weak work (incomplete fuel combustion due to too rich mixture), relatively high water temperature (combustion continues when entering the exhaust stroke), and exhaust smoke when accelerating becomes thicker. When these symptoms appear, it can be judged that the air filter is blocked, and the filter element should be removed in time for maintenance or replacement. When maintaining the air filter element, pay attention to the color change of the inner and outer surfaces of the filter element. After removing the dust, if the outer surface of the filter element is clear and its inner surface is clean, the filter element can continue to be used; if the outer surface of the filter element has lost its natural color or the inner surface is dark, it must be replaced. After the air filter element has been cleaned 3 times, it can no longer be used regardless of the appearance quality.

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