1, look up and down smoke, check wear and tear in the engine work, open the oil mouth, such as a share of thick smoke from the oil mouth, smoke, smoke, the phenomenon is serious, indicating that the North V3 parts piston, cylinder liner, piston ring and other parts serious wear.

Open the lid of the valve room, if there is a blue or white smoke from the root of the valve (the valve face), which is smoking, smoking is serious, indicating that the valve or valve seat is worn seriously or ablated, or the gap between the valve and the valve is too small or even without clearance. By observing the smoke situation, you can see directly which valve or which cylinder leaks and should be repaired in time.

2. Look at carbon deposit and check the working condition. The carbon deposit of the exhaust port of the diesel engine is black and gray. The surface is covered with a layer of white frost and the carbon deposit is very thin, which indicates that the diesel engine is in good working condition. The color and lustre of the coke is dark, but it is not wet. It shows that the diesel engine has a slight burning oil and should be eliminated in time; the thickness of the exhaust gas of a cylinder is obviously higher than that of the other vents, indicating that the injector of the cylinder is bad working or the seal of the cylinder is poor, and should be repaired or replaced. Oil should be repaired; the carbon layer of each cylinder exhaust port is thick, and the color and lustre are deep, because the working temperature is too low, or the fuel injection is too late, the diesel afterburning is serious. It should be properly used and adjusted in time.

3. To see the water temperature and the cooling system, if the cooling system of the engine is too high (over 100 degrees C), it can be explained that the scale of the cooling water of the engine is too thick or the related parts of the cooling system of the V3 parts (such as the thermostat, the pump, the fan and so on) are inefficient or invalid.

4. The timing gear, the cam surface, the servo column and the tappet will wear out after the timing of the timing of gas distribution and the timing of the gas phase engine. The opening and closing time of the inlet and exhaust valves is delayed and the phase of the best air distributor is deferred, so that the efficiency of air charging is reduced and the power of the engine is reduced. Therefore, check the engine valve timing regularly, and if not meet the requirements, it should be adjusted in time.

5, look at smoke, smoke engine when working normally, generally do not smoke or take some light gray smoke, sometimes difficult to see with the naked eye. If black smoke, it shows that the cylinder oil is less gas and the combustion is not complete; if blue smoke is taken, the wear gap between cylinder liner and piston, valve and valve tube is too large. If white smoke is taken, the oil is mixed with water, or the diesel oil is not completely burned, and the exhaust pipe comes out after gasification.

6, look at the injection, JAC stagnant injection pump injection should not be partial, no oil, oil mist uniform, proper range, work can be heard crisp "Chi, Chi" sound, with hand touch V3 fittings high pressure oil tube has pulse movement. Good fuel injection does not fully indicate that there is no problem with the oil part. Therefore, it is necessary to check whether the oil supply rod and the fork are stuck or loosened.

7, look at the ignition, check the morning and evening ignition is to check whether the injection timing is right, that is, whether the oil supply advance angle meets the requirements. When the oil supply is too late (too small in advance angle), the diesel engine starts difficult, the combustion is not complete, the exhaust smoke, the temperature is too high, the power is too high, the fuel supply is too early (too early angle), then the diesel engine has the sound of knocking, easy to damage the parts, easy to turn back when starting, and also shadow at the same time. The power to the engine.