The diesel engine is not allowed to idle for a long time. The diesel engine combustion chamber is mainly in the U-shaped, shaped or spherical volume at the top of the piston. Therefore, each cylinder position is provided with an oil nozzle. When the oil pressure is 0.2MPa or more, the engine oil is continuously sprayed on the piston. The top inner wall is used to cool and control the temperature of the combustion chamber wall. Due to the low oil pressure at the time of idle operation of the diesel engine, the amount of cooling oil on the top of the piston is also small, which tends to increase wear and cause a cylinder-drawing accident. In addition, if the diesel engine speed is low, the injection pump speed is also low, resulting in lower fuel injection pressure, poor atomization of the injector, so the cylinder can not fully burn diesel, carbon deposition increases, plug the nozzle, so that the fuel system failure increased, causing the vehicle Decline in power, increase in fuel consumption, and the adverse consequences of exhaust fumes. For this reason, the diesel manual clearly states that the idle speed of the diesel engine must not exceed 20min30min.
The diesel engine cannot be overloaded for a long period of time. When the diesel engine load exceeds the rated load, the vehicle travels very hard and the engine sound becomes heavy. At the same time, the exhaust pipe emits black smoke, and the rotation speed decreases accordingly. If the load is too large, there is a tendency for the diesel engine to be forced to stall.
If it is overloaded for a short time, the fuel injection pump can automatically increase the oil supply under the action of the governor so that the diesel engine can increase the torque and overcome the excessive resistance of the outside world and continue to maintain the operating state. However, when there is too much fuel in the cylinder, the decrease in the rotation speed leads to a decrease in the air supply. As a result, the diesel engine becomes rough and vibrations increase. If the engine is overloaded for a long period of time, the rough working condition of the diesel engine will inevitably increase the wear of the engine parts. Sometimes, due to the damage of the crank connecting rod mechanism or the mechanism of the gas distribution mechanism, serious accidents such as burning tiles and pulling cylinders may occur. At the same time, some of the diesel fuel that cannot be fully burned in the cylinder is discharged from the exhaust pipe in the form of black smoke, and part of it forms carbon deposits, which causes the vehicle's power to drop and the fuel consumption to rise. For this reason, avoid overloading and speeding. When the vehicle uphill or feels the diesel engine is overloaded, the gear lever should be dialed into the low gear as soon as possible to restore its normal speed.
Pay attention to the correct use of the fuel tank to use clean diesel, it is of great significance to the diesel engine.
If the diesel is dirty or contains impurities, the wear and corrosion of the plunger, the oil valve and the needle valve in the fuel system will be greatly accelerated, thereby reducing the reliability and durability of the vehicle power. In order to ensure the cleanness of the replacement diesel, the diesel oil to be replaced needs to be precipitated for more than 48 hours.
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