What is the reason for the lack of oil pressure?

The normal oil pressure during engine operation should be maintained at 0.25 to 0.35 Mpa. If the oil pressure is lower than 0.2 Mpa, or the oil pressure is high or low, the lubrication system is faulty and the oil pressure is insufficient. The cause must be found in time to be excluded.

1. Insufficient oil in the oil pan

If the amount of oil is insufficient, the pump oil of the oil pump will drop, and even the air will be inhaled. The oil should be added as required. If the amount of oil is insufficient due to burning oil or leakage, it should also be excluded from burning oil or leakage.

2. Oil quality does not meet the requirements

Different models use different grades of oil, that is, the same model also uses different grades of engine oil in different seasons. If the wrong oil is used, the oil viscosity will be too thin and the pressure will be insufficient. It should be used according to the regulations. In addition, after long-term use of the engine oil, it is easy to oxidize and deteriorate, the viscosity is lowered, the lubrication performance is deteriorated, and it must be replaced in time.

3. Oil or water mixed in the oil

If the fuel is mixed into the oil, the oil will be diluted; if the water is mixed into the oil, the oil will be emulsified and deteriorated. These will reduce the lubricating effect of the oil. The oil must be replaced, and the cause of the fuel and moisture mixed into the oil should be found and eliminated.

4. The oil temperature is too high

When the cooling system is severely scaled, the heat dissipation is poor, or the engine temperature is too high due to excessive overload for a long time, the oil will become thin. If the clearance between the cylinder liner and the piston is too large, the high temperature gas in the cylinder will enter the crankcase, which will also raise the temperature of the oil. It is high and thin, and it is easy to escape from the friction pair.

5. The oil filter is clogged or the oil path is leaking.

When the oil filter screen is clogged, the oil pump can not suck in enough oil; when the oil inlet pipe is cracked or the pipe joint gasket is not flat, not tightened, or the joint surface between the pump body and the body is not flat, the paper pad is damaged (such as a single cylinder diesel engine) When the oil pump draws in air, these can cause insufficient oil pressure. The filter should be cleaned or replaced, the suction pipe and gasket should be replaced, and the pipe joint should be tightened.

6. Insufficient pump oil pressure

When the gear pump shaft and the bushing, the gear end face and the pump casing gap, the tooth side clearance or the radial clearance are excessively worn due to wear, or the rotor pump shaft and the bushing clearance, the rotor radial and end clearance are excessively worn due to wear Will cause the pump oil pressure to drop. In addition, when the paper pad between the pump body and the pump casing is too thick and the outer rotor is chamfered, the leakage inside the pump is serious, and the pump oil pressure is also lowered. It should be ground or replaced.

7. The pressure limiting valve is seriously leaking oil

When the pressure limiting valve spring is broken, the valve core and the valve seat are worn or the impurities are stuck and the closing is not strict, the oil in the main oil passage leaks into the oil sump. The spring should be replaced and the spool should be ground.

8. Oil filter and main oil passage blockage

At this time, the leakage loss in the oil pump increases, and the friction pair such as the bearing bush is easily ablated due to insufficient oil, and should be cleaned and dredged.

9. Increased friction loss of friction pair

When the clearance between the main bearing cap and the seat hole of the single-cylinder diesel engine is too large, and the clearance between the journal and the bearing bush is too large, the oil is easily lost, resulting in a drop in oil pressure. At this time, a kraft paper pad can be placed on the main bearing cover of the single-cylinder diesel engine to block the leakage; the bearing bush is replaced and the journal is repaired.

10. Oil cooling nozzle oil leakage

On the main oil passages of some direct-injection high-power diesel crankcases, an organic oil cooling nozzle is installed, and oil is sprayed into the piston inner cavity to help cool the pistons of the cylinders. If the oil cooling nozzle is loose or the spool is severely worn, the oil will leak into the oil sump from the nozzle, causing the bearing bush to ablate due to insufficient lubrication and flow of oil. The nozzle should be tightened to repair or replace the valve plug.

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