When the engine is in operation, the contact surfaces of the moving parts such as the piston, the piston ring and the cylinder wall, and the crankshaft and the main bearing are relatively moved at a high speed to cause friction. If the engine's oil pressure is too low, it will not be fully lubricated, the work surface heat and wear, will reduce the life of the parts, affecting the engine's power performance. Caused by the engine oil pressure is too low due to: First, the lack of oil in the sump The oil sump of the engine is the container for the storage oil, the oil sump of the sump is to have a certain amount. There is a tick mark on the oil scale. If it is too low, it will affect the oil pressure. Therefore, it is necessary to regularly check the amount of oil in the sump, and add it in time if it is insufficient. Second, the oil filter blocked oil filter function is to remove impurities in the lubricating oil to keep the lubricating oil clean. If the filter is contaminated by excessive impurities, the oil pressure output by the oil pump is reduced. Therefore, the filter should be regularly cleaned to remove impurities and keep it open. Third, the choice of motor oil grade does not change the viscosity of the oil with the temperature will change. Therefore, the engine must use different types of engine oil in different seasons. For example, when the vertical 195 diesel engine is in use, it is required to use the HC-11 diesel engine oil in spring and autumn, the HC-14 diesel engine oil in summer, and the HC-8 diesel engine oil in winter. If it is misused, the viscosity of the oil is too high or too low, which will affect the pressure of the oil and will not meet the needs of the engine work. Fourth, pressure limiting valve, return valve spring break or elastic weakened In general, the engine oil pressure can be achieved by adjusting the regulator valve. However, if the adjusting spring in the regulating valve is broken or the elasticity is weakened due to fatigue, and the adjusting valve loses its regulating effect, when the oil pump output oil pressure is too low and the oil pressure cannot be raised, the engine work will be affected. The broken pressure regulating spring or loss of elastic pressure regulating spring should be replaced in time. 5. When the oil leakage engine is working at the oil lube joint, the oil follows the tight oil path and then flows back to the oil pan through the oil pan, the filter, the oil pump, etc. If the oil is leaked at the joint The oil pressure in the oil passage will be “depressurized†and the pressure will be too low to meet the needs of engine lubrication. The joints on the oil pipelines should be tightened regularly to prevent them from leaking. This not only ensures the need of oil pressure, but also increases the economic benefits of the use of the machine by the operator. In addition, the engine's main bearing bush and the main journal, the connecting rod shaft and the crank wear seriously, and the fit gap is too large and other reasons also cause the engine oil pressure is insufficient. When the oil pressure is found to be too low, it should be shut down one by one and checked carefully to find out the cause of the malfunction and eliminate it in time. Never allow the engine to continue working under low oil pressure.