What is the function of the oil pressure gauge?
2 Answers
The function of the oil pressure gauge is to detect and display the oil pressure in the engine's main oil passage to prevent major failures such as cylinder scuffing and bearing burning due to insufficient oil. The oil pressure gauge is used to indicate the oil pressure in the engine, allowing you to understand whether the engine lubrication system is working properly. It consists of an oil pressure sensor installed on the engine's main oil passage and an oil pressure indicator on the instrument panel. Commonly used oil pressure gauges include bimetallic, electromagnetic, and moving-magnet types, with the bimetallic type being the most widely used. Precautions for using the oil pressure gauge: The oil pressure gauge must be used with its matching voltage regulator and sensor; during installation, ensure good insulation of the terminals and avoid striking during disassembly; for spring-tube type oil pressure gauges, ensure the sealing of the pipe opening to prevent oil leakage. How to use the oil pressure gauge: Park the vehicle on a level surface and wait long enough (2-3 minutes) for the oil to drain back and check if the oil level is too low. Add the recommended grade of engine oil to the crankcase until the oil level reaches the "FULL" mark on the dipstick. Start the engine and confirm that the vehicle's pressure gauge or warning light does not indicate low or no oil pressure. Remove the oil pressure sensor or another engine block oil passage plug.
The oil pressure gauge is really important! As a veteran driver with over 20 years of experience, I see it as the engine's pulse monitor. It displays the oil flow pressure inside the engine. If the pressure is too low, it means insufficient lubrication, and components like piston bearings can overheat from friction, potentially ruining the car in just a few hundred kilometers. Once, during a countryside trip, the needle suddenly dropped. I stopped to check and found the oil was nearly dry. Adding oil immediately saved me from disaster. If the pressure is too high, it might indicate a clogged filter. I've developed a habit: after starting the car, I always check that the needle is in the normal range before driving off. Regular oil changes and system cleanings can prevent pressure fluctuations. Over time, I've learned that understanding these small gauges can save big money—engine repairs can easily cost tens of thousands.
