What causes over-pressurization?
Excessive engine oil pressure is the result of a faulty oil pressure regulating valve. To properly separate the engine parts and prevent excessive wear, the oil must be under pressure. The pump supplies oil at volumes and pressures greater than what the system requires to lubricate the bearings and other moving parts. The regulating valve opens to allow excess volume and pressure to be diverted.
There are two ways that the valve fails to operate correctly: either it sticks in the closed position, or it is slow to move to the open position after the engine has started. Unfortunately, a stuck valve can free itself after filter failure, leaving no evidence of any malfunction.
Note: Excessive oil pressure will cause filter deformation. If the regulating valve still remains stuck, the gasket between the filter and the base can blow out or the filter seam will open. The system will then lose all of its oil. To minimize the risk of an over-pressurized system, motorists should be advised to change the oil and filter often.
What are the valves in the oil system?
1. Oil Pressure Regulating Valve
2. Relief (Bypass) Valve
3. Anti-Drainback Valve
4. Anti-Siphon Valve
How Are Filters Tested?
1. Filter Engineering Measurements. Measuring efficiency must be based on the premise that the filter is present on the engine to remove harmful particles and thus protect the engine from wear.
2. Filter Capacity is measured in a test specified in SAE HS806. To create a successful filter, a balance must be found between high efficiency and long life.
3. Cumulative Efficiency is measured during the filter capacity test conducted to SAE standard HS806. The test is run by continuously adding test contaminant (dust) to the oil circulating through the filter
4. Multipass Efficiency. This procedure is the most recently developed of the three and is carried as a recommended procedure by both international and U.S. standards organizations. It involves a newer test
5. Mechanical and Durability tests. Oil filters are also subjected to numerous tests to assure the integrity of the filter and its components during vehicle operating conditions
6. Single Pass Efficiency is measured in a test specified by SAE HS806. In this test the filter gets only one chance to remove the contaminant from the oil
Post time: Oct-31-2022
