What is the method for oil pressure testing?
2 Answers
The method for oil pressure testing is: 1. Disconnect the wiring harness plug of the oil pressure sensor and remove the oil pressure sensor; 2. Place the oil pressure gauge in a location where it will not come into contact with rotating or high-temperature engine components; 3. Start the engine and check for oil leaks at the oil pressure gauge connection; 4. Run the engine until it reaches normal operating temperature, then check the oil pressure gauge readings at both idle and 2000 RPM, comparing them with the standard pressure values. The reasons for insufficient oil pressure are: 1. Lack of oil; 2. Clogged oil pump screen; 3. Faulty pressure relief valve; 4. Clogged oil filter; 5. Blockage or cracking in the engine cylinder head or block; 6. Excessive clearance in the engine crankshaft, camshaft, or connecting rod main bearings.
I just watched the mechanic perform an oil pressure test at the repair shop, and it's actually quite crucial. After warming up the engine and turning it off, lift the car and locate the oil pressure sensor port. Unscrew the sensor and screw in the adapter for the dedicated test pressure gauge, just like connecting a T-joint. Once the gauge is connected, start the engine again and maintain the RPM between 1500-2000. At this point, just keep an eye on the pressure gauge needle reading. Under normal operating temperature and RPM, most cars should display between 1.5 to 4.5 bar. If the pressure is too low, potential issues could include a worn oil pump, clogged oil passages, or excessive bearing clearance. Never perform the test when the engine is cold, as the readings won't be accurate—I've seen people make that mistake before.
