The function of the oil pump is to force the oil to the moving surfaces of various engine parts after it has been raised to a certain pressure. Conventional fuel vehicle oil pumps can be divided into two types according to their structure: gear type and rotor type. The EA888 second-generation oil pump is a typical gear-type variable displacement oil pump. Oil pump structure and principle.
The Volkswagen EA888 engine uses a variable displacement oil pump that can adjust the two states of high oil pressure and low oil pressure. Structurally, the pump is an external gear pump, characterized by an axially movable passive gear. By moving the gear, the delivery rate of the oil circulation system can achieve two states of high pressure and low pressure controllable adjustment.
The engine makes a ticking sound at idle speed. The engine fault light comes on. The red oil pressure warning light on the dashboard. The oil pressure gauge shows that the pressure is lower than the normal setting value.
The red warning light on the instrument will illuminate when the engine oil pressure at idle speed is lower than 0.8BAR. At this time, it is necessary to check whether the oil pressure regulating valve is faulty.
If the oil filter has not been replaced for a long time, the clogged oil filter will cause the oil supply pressure of the oil pump to increase, causing accelerated wear of the gear chamber in the oil pump.
When the engine is running at overspeed with load, the amount of oil leakage increases. If the pressure limiting valve of the oil pump becomes stuck or lags in operation, the oil pressure will be instantly too high or too low, the pressure switch will be disconnected, and the oil alarm light will light up. At this time, it needs to be replaced.
Oil pump.
Mahle EA888 second generation improved oil pump
A888 second generation improved oil pump
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