Diesel engine has air, oil, fuel oil, cooling water four filters, generally known as "four filters". They are respectively responsible for the filtration of impurities in the engine intake system lubrication system, combustion system and cooling water system.

The most harmful to the performance and life of diesel engine is the impurity particles and pollution in the diesel engine. They are the number one killer of engines. A filter is the only way to avoid particles and contamination. With the progress of engine technology, the requirement of filter is higher and higher.

Due to the filter production enterprises good and bad. The filter was originally designed to filter out harmful impurities in various substances entering the diesel engine. So that the engine can work normally under various working conditions, and can reach the prescribed service life.

However, counterfeit, especially inferior filter, not only can not achieve the above effect, but also bring various hazards to the engine. The common hazards are as follows:

1. The use of low-cost filter paper to make filter elements, because of its large pore size, poor uniformity, low filtration efficiency, can not effectively filter out harmful impurities in the material into the engine, resulting in early engine wear.

2. The use of low quality adhesive, can not be firmly bonded, resulting in short circuit at the filter element bonding; A large number of harmful impurities into the engine will reduce the life of the diesel engine.

3. The oil resistant rubber parts are replaced by ordinary rubber parts. In the process of use, due to the failure of the internal seal, the internal short circuit of the filter is formed, so that part of the oil or air containing impurities directly enters the engine. Cause early engine wear.

4. The material of the central pipe of the oil filter is thin instead of thick, and the strength is not enough. In the process of use, the central pipe is deflated, and the filter element is damaged and blocked the oil circuit, resulting in insufficient engine lubrication.

5. The end cover, center pipe, shell and other metal parts of the filter element are not treated with rust prevention, resulting in metal rust and impurities, so that the filter becomes a pollution source.

Therefore, it is recommended that users be careful when replacing the filter.