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1, the phenomenon of failure
1 When the engine is running, the oil pressure is always too low;
2 After the engine is started, the oil pressure is quickly reduced.
2. Cause of failure
1 The oil in the oil pan is insufficient;
2 oil viscosity is small;
3 The pressure limiting valve is improperly adjusted, the spring is broken or the elastic force is insufficient;
4The oil filter bypass valve is not sealed or its spring is broken and the elastic force is insufficient;
5 engine oil inlet pipe joint loose or oil pipe rupture;
6 oil pump malfunctions;
7 oil filter is blocked;
8 The clearance between the main bearing of the crankshaft, the connecting rod bearing or the camshaft bearing is too large;
9 oil pressure gauge or sensor failure.
3, failure analysis
1 When the oil pressure is always too low, first pull out the oil dipstick and check if the oil is sufficient. If it is not enough, it should be added according to the standard; if it is sufficient, it should be checked whether the oil meter or sensor is invalid, and the failure must be replaced. After the change, the pressure is still too low, the sensor should be removed. If the oil is sprayed out in a short time, check the oil filter bypass valve, pressure limiting valve, oil inlet pipe, filter and oil pump, etc. ;
2 When the engine is just working, the oil pressure is normal. After a period of operation, the oil pressure drops rapidly, indicating that the oil in the oil pan is insufficient or the viscosity of the oil is too small.
3 During engine operation, the oil pressure drops suddenly, and should be stopped immediately to stop the fire, check the oil for serious leakage. This type of failure can occur, for example, when the oil filter gasket is damaged.
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