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oil pressure gauge jumps up and down
When the engine is running and the oil pressure is detected, the pointer of the oil pressure gauge sometimes swings left and right, indicating that the oil pressure in the main oil circuit is unstable. The unstable oil pressure is mainly caused by the following reasons:
① The oil pump draws air.
② The oil pump suction is insufficient.The filter screen of the oil collector is blocked by impurities or installed incorrectly, resulting in the filter screen not being fully immersed in the oil, and the oil used is too sticky., All of these can lead to insufficient oil suction and short supply time of the oil pump, resulting in unstable oil pressure. The filter should be inspected and cleaned, and the oil should be replaced.
③ The return valve does not work sensitively.The return valve is also known as the oil pressure regulating valve. If its spring is severely rusted or the valve seat is partially worn, the spring is broken or severely deformed, the valve core will get stuck and cannot switch sensitively with pressure changes. The return valve can be removed for cleaning and rust removal, and the spring can be replaced if necessary.
Maintenance: When the vehicle leaves the factory, the opening pressure of the return valve has been adjusted and generally does not require disassembly or adjustment. Method of Eliminating Oil Pressure from High to Low: When the engine is idling, the oil pressure is normal; When the engine is running at high speed, the oil pressure fluctuates.
The main reasons are as follows:
There is a problem with the oil pump. The oil pump sucks in air. When the engine is running at high speed, the suction force of the oil pump increases, and air enters people from places where the oil pipe seal is not tight. Due to the compressibility of air, the oil pressure fluctuates. Or the spring of the return valve of the regulating valve may be stuck by foreign objects, or the spring may bend and rub against the seat hole, hindering the movement of the spring and making it difficult to open and close the ball valve. When the oil pressure in the main oil circuit rises and the ball valve opens, the pressure in the main oil circuit is released. However, due to the blocking effect of the spring, the ball valve does not close until the oil pressure drops to very low or even close to zero. Then, the oil pressure in the main oil circuit rises again and the ball valve opens again, causing significant oil pressure fluctuations. The oil pan is short of oil, the oil level is at the limit position of the filter suction port, or there are impurities in the oil pipe that are not completely blocked, causing the oil pump to occasionally suck oil, causing oil pressure fluctuations. Improper assembly or gluing of the pressure limiting valve can cause unstable oil flow resistance, or damage to the oil pressure gauge, which can also cause oil pressure fluctuations.
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