During the working process of the engine, if the oil pressure is less than 0.2Mpa, or if the oil pressure suddenly changes to or fluctuates with the change of the engine speed, it may even suddenly drop to zero. At this time, it shall stop immediately to find out the reason. Burns, pull cylinders and other major accidents. Therefore, during the use of the engine, the pressure of the oil must be given high priority. The main reasons for the low oil pressure are as follows: 1. If the oil is not enough, the oil pump will reduce the pump oil or pump oil because of the air, resulting in a drop in oil pressure. Crankshaft and bearings, cylinder liners, and pistons all contribute to increased wear due to poor lubrication. The oil level in the oil pan should be checked before each shift to ensure that there is a sufficient amount of oil. 2. If the engine temperature is too high If the engine cooling system is heavily scaled, the work is poor or the engine is overloaded for a long time, or the fuel injection pump is too late, it will cause the engine to overheat. This will not only accelerate the engine oil aging, deterioration, but also It is easy to dilute the oil, and the oil pressure drops due to a large amount of loss in the fitting gap. The scale in the cooling system piping should be removed; the oil supply time adjusted; and the engine operated at rated load. 3. If the oil pump stops rotating, if the pin of the oil pump drive gear and the drive shaft is cut off or the key is off, the oil pump sucks the foreign material and the oil pump gear is stuck. Both stop the oil pump and the oil pressure drops to zero. The damaged pin or key should be replaced; the filter should be set at the suction port of the oil pump. 4. When the oil pump is not enough, the pump oil will decrease when the gap between the oil pump shaft and the bush, the clearance between the gear end surface and the pump cover, the backlash or the radial clearance exceed the allowable value due to wear. , resulting in a drop in lubrication pressure. Should replace the bad parts in time; grind the plane of the pump cover so that the gap with the end face of the gear can be restored to 0.07-0.27mm. 5, crankshaft and bearing clearance is too large When the engine is used for a long time, the clearance between the crankshaft and the connecting rod bearing is gradually increased, so the oil wedge is not formed, and the oil pressure also decreases. According to measurements, the oil pressure drops by 0.01 Mpa for each 0.01 mm increase in the gap. Can grind the crankshaft, matching the appropriate size of the connecting rod bearings, so that the gap back to the technical standards. 6. Plugging of oil filter When the oil cannot be circulated because the filter is clogged, the safety valve provided on the base of the filter is opened and the oil directly enters the main oil passage without filtering. If the opening pressure of the safety valve is adjusted too high, the filter cannot be opened in time when the filter is blocked. Therefore, the pressure of the oil pump increases, the internal leakage increases, and the oil supply to the main oil passage decreases accordingly, causing the oil pressure to rise. Decline. The oil filter should be kept clean; the opening pressure of the safety valve should be properly adjusted (usually 0.35-0.45 Mpa); the spring of the safety valve or the mating surface of the grinding ball and the valve seat should be replaced in time to restore its normal working performance. 7. Oil leaks from oil radiators or pipes will not only dirty the engine, but will also cause the oil pressure to drop. If the pipeline is blocked by dirt, the flow of oil will be reduced due to the increase in resistance, resulting in a drop in oil pressure. Should remove the radiator, weld or replace the radiator, and can be used after the pressure test; clear the pipeline dirt. 8. If the gauge fails or if the tubing is clogged, if the gauge fails, or if the tubing from the main gallery to the gauge fails to circulate due to accumulation of dirt, the oil pressure will drop significantly. When the engine is idling at a low speed, slowly loosen the tubing connector, determine the fault location according to the gushes of the oil flow, and then flush the tubing or replace the pressure gauge. 9. The clogging of the suction cup causes the pressure gauge pointer to flicker. In general, the indication of the oil pressure gauge should be higher than when the throttle is at high throttle, but abnormal situations sometimes occur. If the oil is dirty or sticky, it can easily clog the oil pan. When the engine's small throttle is running at a low speed, the main oil gallery can still establish a certain pressure, so the oil pressure is normal. When the throttle is increased at a high speed, the oil pump suction amount will be significantly reduced due to excessive suction cup resistance, and the value of the oil pressure gauge on the main oil gallery will fall due to insufficient oil pressure. Clean the oil pan or change the oil. 10. Engine oil grades are incorrect or the quality is unqualified. Different types of engines must be provided with different types of engine oil. Different types of engine oils of different models should be used for the same type of engine. If it is used wrongly or if the grade is wrong, the engine will increase the leakage due to the low viscosity of the oil, which will reduce the oil pressure. The engine oil should be selected correctly, and the engine oil can be reasonably selected according to the season change or different regions. At the same time, the diesel engine must use diesel engine oil and it must not be replaced by gasoline engine oil.
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