During the quality guarantee period of the new car, the substitute of the filter (filter element) should not be used. Even after the quality guarantee period, the filter should be carefully selected. The performance of the diesel filter has a grade code according to the ISO standard. In addition to the performance test according to the SAE standard, the air filter element must be subjected to a bench test to meet the original intake resistance of the engine's rated intake air. Qualified oil filter must meet the original design of engine cylinder pressure, oil temperature, flow, viscosity and vehicle operating conditions, etc., and the comprehensive balance of core quality must be considered. The hydraulic oil filter element is marked on the manufacturer's product sample or nameplate as the nominal filtration accuracy, not the absolute filtration accuracy. Only the beta value determined by the pass test can indicate the filtration capacity of the filter. The hydraulic oil filter element should also meet the pressure loss requirements (the total pressure difference of the high-pressure filter is less than 0.1PMa, and the total pressure difference of the return oil filter is less than 0.05MPa) to ensure the optimization of flow and filter life.

When selecting the filter (filter element), you can choose the original one or the second brand. It should be noted that the selected filter element should be checked and accepted to check whether it meets the performance indicators it should have.

The air filter element selected for the air filter element must match the power, economy and reliability of the original engine.

(1) The air chlorine flow rate in the technical parameters of the rated air intake filter element should be greater than the rated air intake of the equipped engine.

(2) The filter material has requirements on the filter material's thickness, tension resistance, original air intake resistance, and filtration accuracy. Imported diesel engine requires air filtration accuracy of 5μm, domestic diesel engine should also be less than 20μm. The filtration accuracy of high efficiency filter paper is 2μm, ordinary imported filter paper is 30μm, while domestic filter paper is only 80μm.

(3) Filter element performance test:

① Flow-resistance (pressure drop) test Determine the air flow pressure loss (flow-resistance or flow-pressure curve).

②The original filtration efficiency test can calculate the dust collection efficiency of the filter element, and the dust reduction rate of the normal filter element should be more than 99%.

③Dust storage capacity test and cumulative efficiency test. Excessive dust accumulation in the filter element causes blockage and increases air intake resistance. The air intake resistance when the engine power is reduced by 5% or the fuel consumption is increased by 5% is a limit value. When this value is reached, the filter element must be cleaned or replaced. During the test, the dust weight when the air intake resistance or pressure drop reaches 7-46kPa is the dust storage capacity of the filter element, and the filtration efficiency during this test is the cumulative efficiency.

④Original intake resistance test. When the intake resistance 9 is rated, the pressure difference between the inlet and outlet when the air volume passes through the filter element) should not exceed 3.2kPa, and the power will drop and the engine will emit black smoke.

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