Engine lubrication hydraulic system oil pressure too high analysis

The function of the engine lubrication hydraulic system is to lubricate, clean, cool and seal the friction components.

The lubrication hydraulic system consists of an oil collection filter, an oil pump, a pressure limiting valve, an oil filter, an oil line, and an oil passage.

Common faults in lubricating hydraulic systems include: excessive oil pressure, low oil consumption, excessive oil consumption, and deterioration of oil.

This article first introduces the analysis of the situation of excessive oil pressure.

1, the phenomenon of failure

1 When the cold car is started, the oil gauge indicates a pressure of about 0.5MPa.

2 Turn on the ignition switch, the oil gauge indicates a pressure of about 0.2MPa, and increases to about 0.5MPa or more after starting.

3 When the engine is running, the oil pressure suddenly increases.

2. Cause of failure

1 oil viscosity is too large;

2 The pressure limiting valve is improperly adjusted;

3 cylinder block lubricating oil passage is blocked;

4 The main bearing or connecting rod bearing clearance is too small;

5 The oil filter element is clogged and the bypass valve is difficult to open;

6 oil pressure gauge or its sensor is invalid.

3, failure analysis

1 When the oil pressure is too high, first check if the viscosity of the oil is too large, and if the pressure limiting valve is improperly adjusted (the spring is adjusted too hard). For new engines, check if the clearance between the main bearing, the connecting rod bearing or the camshaft bearing is too small;

2 When the oil pressure suddenly increases, first check if the oil filter element is dirty and the bypass valve spring pressure is adjusted too much. If it is good, it is generally blocked in the lubrication system oil passage. After the camshaft timing gear is broken, the debris is easy to block the oil passage, so it must be cleaned;

3 Turn on the ignition switch, if there is pressure indication on the oil gauge, check the oil gauge and sensor are in good condition.