Air filter, for filtering suspended particulate matter in the air of the cylinder, in order to reduce the wear of cylinder and piston and piston ring. The engine works in 3 kinds of medium, the amount of air is the largest. If air filter cannot effectively filter the air suspended particulate, to a lesser extent, accelerate cylinder, piston and piston ring wear, will cause strain cylinder, shorten the service life of the engine.

I. Misunderstanding of air filter using

1. Buy air filter without quality. Maintenance personnel do not have a correct understanding of the importance of air filter, the purchase of filter is only cheaper, not for quality, Lead to appear abnormal soon after air filter installed in the engine.
Especially the auto parts market fake filter products under many circumstances, shop around before buying, adhere to the principle of quality first.

2. Dismantle when using air filter. it's a scientific fact that using air filter in engine, but some drivers dismantle air filter at will, the unfiltered air engine directly .
The test of the removal of the air filter of the truck shows that after the removal of the air filter, the engine cylinder wear increases 8 times, the piston wear increases 3 times, and the wear of the piston ring increases 9 times.

3. maintenance and replacement of the air filter is not from the actual. With the car "user manual", although the provisions to travel mileage, or working hours as filter maintenance or replacement of the data. But in fact, the maintenance and replacement of air filter cycle, but also related to environmental factors.
Often travel in the dust laden environment in the car, air filter maintenance, replacement cycle should be short; while in the environment with a small amount of dust, air filter maintenance, replacement cycle may be appropriate to extend.

In practical work, many car repair workersjust according to the provisions to maintenance filter, rather than according to the environmental factors, to wait until mileage standards, till the engine has been significantly abnormal then start to maintain filter. As a result, when maintain filters at this time, we can not only redeem the lost, but also have greater damage for engine. What’s more, parts of drivers even don’t know the air filter have their own life, they still use it if the surface is not broken.

II.The way to distinguish air filter
How is the work condition of air filter, when it should be maintained or changed, you can distinguish like below:
In the abstract, we should measure the working life and maintain timeswith gas flow rate which through the filter element, and the ratio of gas flow to the engine this two factors. When the rate is larger than the ratio, filters can work normally; when the rate is the same as ratio, we should maintain the filters; when rate is smaller than the ratio, the filter cannot be used , otherwise the engine should be damaged a lot, even cannot be used any more.

When the air filter cartridge was blocked, cannot satisfy the required air flow, the engine working situation will be abnormal, such as the roar of nausea, accelerate retardation (intake is insufficient to make the cylinder pressure enough) and unable to work (due to the mixture too thick and combustion incomplete), water temperature is relatively high (into the exhaust stroke combustion still continues), and accelerate exhaust smoke thickened. When these symptoms occur, we can judge that air filter clogging should be promptly remove the filter element for maintenance or replacement.

When maintain the air filter element, we should pay attention the colour change in and outside the filter element. After cleaning the dust, if the outer surface of filter paper is clear and clean, it can be used; when the filter paper is dark and lose their true colour, we should change the filter.

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