The engine will suck in a lot of air during operation. If the air is not filtered, the suspended dust in the air will be sucked into the cylinder, which will accelerate the wear of the piston set and cylinder. Large particles entering between the piston and the cylinder will cause serious "cylinder pulling", which is particularly serious in a dry and sandy working environment. The air filter is installed in front of the carburetor or the intake pipe to filter out dust and sand particles in the air and ensure that sufficient and clean air enters the cylinder
According to the filtering principle, air filters can be divided into filtering type, centrifugal type, oil bath type and composite type
1. During installation, whether flange, rubber pipe or direct connection is adopted between the air filter and the engine intake pipe, it must be tight and reliable to prevent air leakage. Rubber gaskets must be installed on both ends of the filter element; The wing nut fixing the air cleaner housing cannot be tightened too tightly to avoid damaging the paper filter element.
2. During maintenance, the paper filter element must not be cleaned in oil, otherwise, the paper filter element will become invalid, which may also cause flying accidents. During maintenance, only use vibration method, soft brush brushing method (brush along its folds) or compressed air back blowing method to remove the dust and dirt attached to the surface of the paper filter element. For the coarse filter part, the dust at the dust collection part, blade and cyclone tube shall be removed in time. Even if the paper filter element can be carefully maintained every time, it will not completely restore its original performance, and its air inlet resistance will increase. Therefore, when the paper filter element needs the fourth maintenance, it should be replaced with a new filter element. If the paper filter element is cracked, perforated or the filter paper is unglued from the end cover, it should be replaced immediately.
3. When using, the paper core air filter shall be strictly prevented from being wetted by rain, because once the paper core absorbs a lot of water, the air inlet resistance will be greatly increased and the mission will be shortened. In addition, the paper core air filter cannot contact with oil and fire.
4. Some vehicle engines are equipped with whirlwind air filters. The plastic cover at the end of the paper filter element is a deflector. The blades on the cover make the air rotate. 80% of the dust is separated by centrifugal force and collected in the dust collecting pocket. The dust reaching the paper filter element is 20% of the dust inhaled. The total filtering efficiency is about 99.7%. Therefore, when maintaining the cyclone air filter, be careful not to miss the installation of the plastic deflector on the filter element.