Engine oil pressure marks the quality of the lubrication system. Once the oil pressure is abnormal, the cause should be found out immediately and ruled out. Below, Kang Kang is aimed at oil pressure four kinds of common abnormal phenomenon and everybody one by one answer, quickly delimit key!

First, the oil pressure has been very low

No matter what speed or temperature the engine is, the oil pressure indicator indicates that the oil pressure is always below 69kPa, and the oil pressure warning light is flashing.

The main reason is that:

1., oil quantity, oil quality does not meet the requirements. If the oil in the oil pan is too little, the oil becomes thinner and worse, the viscosity drops; the oil is mixed with water, diesel oil, gasoline and so on.

2. pump serious wear or improper assembly, the pump oil pressure is not up to the requirements, the oil pump leak too much inside.

3. oil filter screen or filter is seriously blocked by oil sludge, oil is difficult to enter the main oil lane.

4. machine oil pump inlet pipe joint seal is not strict, there is a serious suction phenomenon.

5., the lubrication circuit has serious leakage, so that the main oil from the leakage of oil from the main flow back to the bottom of the oil tank and pressure relief. Parts of the leakage mainly has: the technology of oil on the body wall loosening; oil pipe rupture; crankshaft neck centrifugal purification oil cavity plug loose; crankshaft bearing or cam of uranium bearing clearance is too large and so.

6. Baotou North Benz accessories oil pressure gauge and induction plug failure (induction plug wire directly remove the ground, if the pressure returned to normal, indicating induction plug damage)

Two 、 the oil pressure suddenly drops to zero

Baotou northern rush spare parts engine work, oil pressure from normal to suddenly zero, at this time should immediately stop inspection, so as not to lead to burning tile accident.

The main reason is that:

1. oil sump oil drain plug loose or broken, oil cracking oil, large leakage.

The 2. return valve, the adjusting bolt is loosened, and the oil flows back to the oil pan from the return valve.

3. oil strainer filter foreign body was suddenly blocked, the oil can not enter the main oil gallery.

4. machine oil pump drive shaft and drive pin broken, the oil pump suddenly stopped running.

5. Baotou North running down parts oil pressure gauge suddenly damaged.

Three 、 after the engine temperature rises, the oil pressure drops

When the engine cooler (just started), the oil pressure is normal, and the oil pressure drops gradually with the increase of the machine temperature.

The main reason is that:

When the engine temperature rises, the engine oil viscosity decreases, and the oil leakage loss increases.

Such as deterioration of the oil, grades, or crankshaft neck and bearings, camshaft neck and the gap between the bearing and so on, this will happen.

Four, the higher the engine speed, the lower the oil pressure

In the engine, when the small throttle, the oil pressure is normal, after increases the accelerator, the oil pressure meter indication value drops, even tends to zero, reduces after the throttle, the oil pressure also tends to normal.

The main reason is that:

The 1. oil pan is lined with car wash, paper, and gelatinous impurities. When the engine is idle, the suction of the oil pump is small, and the sundries are suspended at the bottom of the oil pan. The oil supply is normal.

When the engine speed is increased, the vacuum suction of the oil pump is increased, and the sundries suspended in the oil oil are absorbed on the filter net, blocking the filter screen, causing the oil supply to be sluggish, and the oil pressure drop. After the throttle is lowered, the suction of the oil pump is reduced, and the sundries are suspended under the weight of the engine, suspended in the oil, and the oil supply is normal, and the oil pressure is increased.

2., plastic texture filter screen in the heat engine change chin, increase the gas, the filter center raised part was sucked up, blocking the oil inlet pipe, so that oil supply suddenly interrupted.

3. pressure regulating valve, return valve, spring break, increase the throttle after the ball valve to open back pressure, but after the reduction of oil pressure, spring can not make the ball back, resulting in continued reduction of oil pressure