机油压力始终过低的原因

The reason why the oil pressure is always too low

首先了解

First understand

机油压力传感器通常安装在主油道中的，如果机油压力表机油压力传感器正常，而机油压力表指示压力过低，可根据润滑系统的组成，油路对故障可能原因进行分析。

The oil pressure sensor is usually installed in the main oil passage. If the oil pressure sensor of the oil pressure gauge is normal and the oil pressure gauge indicates that the pressure is too low, the possible causes of the fault can be analyzed according to the composition of the lubrication system and the oil circuit.

主要对油路按油流方向以机油压力传感器为界分成前、后进行分析。

The oil circuit is mainly divided into front and rear according to the oil flow direction and bounded by the oil pressure sensor.

主要原因

main cause

机油压力传感器前：主要原因有油路不畅（如滤清器堵塞）或供油不足（如机油量不足）而导致机油压力不足。

Front of oil pressure sensor: the main reason is insufficient oil pressure due to poor oil circuit (such as filter blockage) or insufficient oil supply (such as insufficient oil).

机油压力传感器后：主要原因有油路泄油过快（如曲轴轴承间隙过）。

After the oil pressure sensor: the main reason is that the oil circuit leaks too fast (such as excessive crankshaft bearing clearance).

应对措施

Countermeasures

（1）机油压力表失灵或通向压力表油路堵塞。分别松开油管与油压表连接（另一端与主油道连接）的螺母或螺栓，观察到机油冒出的压力较，则说明压力表有故障，或通往油压表的油管堵塞。

(1) The oil pressure gauge fails or the oil passage to the pressure gauge is blocked. Loosen the nuts or bolts connecting the oil pipe and the oil pressure gauge (the other end is connected with the main oil passage) respectively. If it is observed that the oil pressure is high, it indicates that the pressure gauge is faulty or the oil pipe leading to the oil pressure gauge is blocked.

（2）机油容量不足、机油变质或机油中有水。定期检查油底壳储油的机油尺刻度，按规定加足机油;检查活塞环与缸套的配合情况，磨损严重应加以修理。

(2) Insufficient oil capacity, deteriorated oil or water in oil. Regularly check the scale of the oil dipstick of the oil pan and add enough oil as required; Check the fit between piston ring and cylinder liner. If it is seriously worn, it should be repaired.

（3）机油牌号不对，粘度小，使机油过稀。更换新的符合规格的机油。

(3) The wrong brand and low viscosity of engine oil make the engine oil too thin. Replace with new engine oil that meets the specifications.

（4）柴油机期超负荷工作，使机油温度过高而变稀。减小柴油机负荷，不允许期超负荷工作。

(4) The diesel engine is overloaded during operation, so that the oil temperature is too high and becomes thin. Reduce the load of diesel engine and do not allow overload operation during the period.

（5）机油集滤器堵塞，使机油吸入量减少而压力过低。清洗机油集滤器。

(5) The oil filter is blocked, which reduces the oil suction and the pressure is too low. Clean the oil strainer.

（6）机油过脏，使用时间过?而变质等，使吸油盘的滤网或油道堵塞。应更换新的机油，并清洗滤网油道。

(6) The engine oil is too dirty and has been used for too long? And deterioration, so that the filter screen or oil passage of the oil suction disc is blocked. Replace with new engine oil and clean the filter oil passage.

（7）机油泵磨损后，使机油泵内漏增，则泵油量减少，或者是机油泵纸垫损坏而渗漏机油。可通过减少机油泵端盖垫片厚度的方法来补偿，如泵油量仍不足时，应修理或更换磨损零件及损坏的垫片。

(7) After the oil pump is worn, the internal leakage of the oil pump increases, the pump oil volume decreases, or the oil leakage is caused by the damage of the oil pump paper pad. It can be compensated by reducing the gasket thickness of the oil pump end cover. If the pump oil is still insufficient, repair or replace the worn parts and damaged gaskets.

（8）检查限压阀的弹簧是否过软、阀门是否磨损过甚。若阀门磨损正常，则应检查弹簧的弹力是否不足。

(8) Check whether the spring of the pressure limiting valve is too soft and whether the valve is worn too much. If the valve is normally worn, check whether the spring force is insufficient.

（9）吸油盘至机油泵的油路装配不严密而漏气，如吸油管空心螺栓拧得不紧等。重新安装，消除漏气故障。

(9) The oil circuit from the oil suction pan to the oil pump is not tightly assembled and leaks, such as the hollow bolt of the oil suction pipe is not tightened. Reinstall to eliminate air leakage.

（10）主轴承、连杆轴承，凸轮轴及轴套等润滑部位磨损，间隙增，润滑油渗漏过多。修理?更换新件，恢复零配件的配合关系，使其间隙在正常范围内。

(10) The lubricating parts such as main bearing, connecting rod bearing, camshaft and shaft sleeve are worn, the clearance is increased, and the lubricating oil leaks too much. Repair? Replace new parts and restore the matching relationship of spare parts to make their clearance within the normal range.

（11）转子式机油泵外转子装反，使泵油量减少。重新安装，使外转子外圆有倒角的一端应装向机油泵体内。

(11) The outer rotor of the rotor type oil pump is installed reversely to reduce the oil volume of the pump. Reinstall so that the chamfered end of the outer circle of the outer rotor should be installed into the oil pump body.

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