What are the causes contributing to the low engine oil pressure, and how can they be eliminated in Sinoteng construction equipment?
The working pressure of the diesel is usually around 100-500KPa. If the cause of the failure is not timely found out and the failure is not timely eliminated, semi-dry friction or dry friction will be caused between friction pairs. If the problem is serious, the bearing bush and cylinder jacket can be geared. Reasons to cause very low oil pressure include:
1. The engine oil is insufficient in the oil sump. The solution is to fill the engine oil to the specified requirements.
2. The mark of engine oil is incorrect. Since the viscosity of the engine oil of different marks varies to influence the pressure of the engine oil, the user must select and use engine oil according to the requirement of the instruction manual.
3. The oil way is blocked, and thus the engine oil cannot enter the main oil way.
4. The coarse filter screen in the oil sump is locally blocked due to dirty oil to cause the insufficiency of the oil absorption amount of the oil pump so as to lead to the insufficiency of the pressure of the engine oil. The solution is to clean the coarse filter screen.
5. The nut of the oil absorption pipe in the oil sump is not tightened and thus the air is leaking. Therefore, the pressure of the engine oil is not enough due to the air suction during the operation of the diesel. Tighten the nut to solve this problem.
6. The oil pump is abraded. Replace the abrasion part.
7. The startup pressure of the oil return valve is too low after regulation to cause the untimely oil return, thus influencing the engine oil pressure of the whole lubricating system. Adjust the pressure of oil return valve.
8. The filter element of the engine oil filter is blocked, and the safety valve also does not work at the same time. Therefore, the engine oil cannot enter the main oil way. Clean or replace the filter element.
9. The pressure-limiting valve of the oil pump is abraded, the spring is deformed, and the matching of the intercepter valve and the seat is not tight, all of which can make the engine oil return to the oil sump. The oil supply is thus insufficient in the oil pump to cause the reduction of the pressure of the engine oil. Replace relevant abrasion parts to solve the problem.
10. The matching clearance between lubricating parts is too big. The abrasion of the main bearing of the crank shaft and the bearing of the connecting rod can especially cause the oversize of the bearing clearance. Thus, the leakage of the engine oil is increased, and the pressures of the main oil way and engine oil are reduced. Adjust the matching clearance.
11. There is serious oil leakage in the front and back oil seals of the crank shaft or the choke plug screw of the main oil way as well as the oil pipe joint to cause the sharply loss of engine oil and the reduction of the oil pressure in the main oil way. Replace or repair relevant components.
12. The measuring instrument is incorrect. Replace the instrument.
13. The matching clearance between the piston of the diesel and the cylinder jacket is too big to cause serious air leakage, heating of the engine oil of the oil sump, temperature rise, viscosity dilution and relatively low pressure.
14. There is diesel oil mixed in the engine oil, but the operation of the engine is normal. Disassemble the fuel delivery pump and the core seal. Replace the leaking fuel delivery pump and engine oil.
15. The diesel oil enters the engine oil, the engine power is reduced, and the oil pressure is reduced. Check the fuel spray nozzle to see if it is clamped or seized. Replace it with a new fuel spray nozzle.
16. The temperature of the cooling liquid of the engine exceeds the normal 100℃ to cause the reduction of the oil viscosity. Refer to the failure eliminating procedures for temperature of the cooling liquid exceeding the normal value.
