The full flow oil filter should undergo the following tests in accordance with the ISO4548 standard.
1. Pressure drop flow characteristic test
Measure the pressure drop flow curve of the oil filter assembly using the specified viscosity of engine oil.
2. Characteristic test of filter element bypass element
Measure the pressure drop bypass flow curve of the filter element. When the pressure drop through the filter element is low, in order to limit the amount of unfiltered oil, the bypass element allows for a small amount of oil leakage below the specified opening pressure drop; When the filter element is completely blocked, all flow can be bypassed without exceeding the specified pressure drop.
3. High pressure drop and high temperature characteristic test
The oil filter will experience a high pressure drop during operation, especially when the filter element is clogged. In addition, the filter element is also affected by the high temperature of the engine oil, and its ability to withstand high pressure drop without damage should be tested under simulated high temperature conditions.
4. Filter life and filtration efficiency test
The particle counting method is used to determine the service life of the filter element. During the test, a relationship curve between pressure difference and test time or pressure difference and ash weight is drawn to achieve the test time or pollutant at 75% of the designed opening pressure of the bypass valve