Why is the pressure of engine oil too high, and how can it be solved in Sinoteng wheel loader?
The normal engine oil pressure is usually kept between 100 to 500KPa during the operation of the diesel. Good lubricating effect cannot be obtained if the pressure of the engine oil is too high or too low. The reasons why the oil pressure is too high generally include the following points:
1. The startup pressure of the pressure-regulating valve of the fuel pump is too high, and the oil returned is not sufficient under a normal rotating speed; the oil amount entering the main oil way increases to cause the rise of the pressure of the engine oil. Adjust the pressure-regulating valve of the oil pump. The method is to use wrench to unscrew the lock nut of the regulating screw of the pressure-limiting valve. Use the screwdriver to unscrew some regulating screws to reduce the spring pressure and reduce the oil pressure of the main oil way to the regulated value. After adjustment, re-tighten the lock nut.
2. The mark of the engine oil does not conform to the requirement and the viscosity is too big, or the viscosity is increased since the temperature of the engine oil is relatively low to raise the oil pressure of the main oil way.
3. The pressure gage of the engine oil is out of work and the measurement is not precise.
4. The oil return valve on the engine oil filter is blocked to make the excessive engine oil incapable of returning to the oil sump during the operation of the diesel to cause the sharply increase of the oil pressure.
5. The safety valve is not tight or the the opening pressure is low to make part of the engine oil enters the mail oil way without filtration, thus increasing the pressure of the main oil way so as to increase the pressure of the engine oil.
6. The assembly clearance between the main bearing of the crank shaft and the bearing of the connecting rod is too small, or the oil way is locally blocked. At this point, the pressure of the engine oil is increased, and the temperature of the oil also becomes too high. The assembly clearance must conform to relevant requirements.
7. The operational temperature of the engine is too low. Check the effluent temperature to see if it is too low. Improve its temperature and turn down the water inlet amount.
