Misunderstandings and identification methods of air filter The task of air filter is to filter the suspended particles in the air entering the cylinder, so as to reduce the wear of cylinder, piston and piston ring. Among the three mediums required for engine operation, the air consumption is the largest and comes from the atmosphere. If the air filter can not effectively filter out the suspended particles in the air, the wear of the cylinder, piston and piston ring will be accelerated, or the cylinder will be strained and the service life of the engine will be shortened.

Quality is not required when purchasing
Because a few maintenance personnel did not recognize the importance of the air filter, they only wanted to buy it cheaply, not for quality, so they bought it at will. As a result, the engine was abnormal soon after it was installed. Especially when there are many fake and inferior products in the current market, we should shop around carefully and always adhere to the principle of quality first.

Dismantle randomly in use
The engine must use air filter, which has scientific basis. However, some drivers randomly remove the air filter so that the engine can directly suck in unfiltered air for operation. The test of removing the air filter on 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 piston ring will increase by 9 times.

Maintenance and replacement are not practical
Although mileage or working hours are specified as maintenance or replacement data in the air filter operation manual. However, the maintenance and replacement cycle of air filter is also related to environmental factors. The maintenance or replacement cycle of the air filter should be shorter for vehicles that often drive in the environment with a large amount of dust; The maintenance or replacement cycle of the air filter can be appropriately extended in the vehicle with a large amount of dust. In actual work, many drivers and repairmen work mechanically according to the regulations, not flexibly depending on the environment and other factors. They just wait until the mileage reaches the standard and the engine working state is obviously abnormal. It should be noted that maintenance at this time will not only cause irreparable loss, but also cause greater harm. What's more, some drivers do not know that the air filter will fail, and they will continue to use it as long as the outside is not damaged.

The way to distinguish
How the air filter works and when it needs maintenance or replacement can be identified by the following methods:
In theory, the service life and maintenance interval of the air filter should be measured by the ratio of the gas flow rate through the filter element to the gas flow 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 the flow rate, the filter shall 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 become worse and worse, or even cannot work.

In actual work, when the filter element of the air filter is blocked by suspended particles to the extent that it cannot meet the air flow required by the engine for operation, the engine will have abnormal operating conditions, such as dull noise, slow acceleration (insufficient intake air leads to insufficient cylinder pressure), ineffective operation (incomplete combustion due to too rich mixture), relatively high water temperature (combustion continues when entering the exhaust stroke), and thicker exhaust smoke when accelerating. When these symptoms occur, it can be determined that the air filter is blocked. 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 element. After the dust is removed, if the outer surface of the filter paper is clear and the inner surface is bright, the filter element can be used continuously; If the outer surface of the filter paper has lost its natural color or the inner surface is dark, it must be replaced.