Dongfeng Xiaokang K07 accelerates sharply, emitting black smoke and blue smoke

The fault phenomenon of black smoke is: when the engine is working, the exhaust pipe emits black smoke, and can smell the pungent gasoline smell, which is more obvious when accelerating. The cause of the failure may be: the mixture is too thick; The spark plug is not working well; Ignition is too late.

Check the concentration of the mixture. After the symptoms of malfunction, first check the carburetor damper. When the engine is working normally, whether there is a phenomenon that the control mechanism is stuck or malfunctioning and cannot be closed or opened, if so, it should be repaired or replaced.

Secondly, it should also be checked: whether the oil level of the float chamber is too high; whether the float is leaky or not, it cannot float; whether the main orifice needle valve is too open; Whether the air filter is clogged, etc.

After the engine is turned off, look at the main nozzle from the carburetor, if there is oil flowing out or dripping, it means that the oil level of the float chamber is too high, and the tongue of the float should be properly bent upwards or an appropriate gasket should be added under the needle valve acne to adjust. Check the float, if there is cracked and oil leakage, it should be welded or replaced.

Note that the weight of the float will increase after welding, and it must be re-adjusted during installation to ensure the normal liquid level height. Check whether the triangle needle valve is not tightly sealed, etc., and replace it if so. Check the oil filter and clean or replace it if it is blocked.

Check the spark plug for flashovers. If the spark plug jumps weakly or abnormally, the mixed gas will not burn, and black smoke will also appear. Unplug the spark plug, the fire is normal and the spark is strong, indicating that the spark plug is not faulty; If the spark of the spark plug does not jump along the electrode, but jumps around, it means that the spark plug is not jumping normally, and a new spark plug should be replaced; If the spark plug has serious carbon deposit, clean it.

The engine exhaust line can be in the process of emitting black smoke, if there are pieces"Sudden protrusions"sound and"Fire"sound, it means that the ignition is too late. If the above situation occurs, it will be corrected in time.

Hello, this suggests that you go to the repair shop to check to see if it is burning engine oil or lack of engine oil?

Hello, it's best to go to the repair shop to see if the oil is burned, this is not normal, go and check it as soon as possible.

Clean the throttle, look at the intake pressure sensor, water temperature sensor.

There is a problem with the sensor, the mixture is too thick, waste oil.

Clean the throttle, not look at the ignition timing.

1. The temperature is not enough, due to the insufficient temperature of the engine, the mixed gas formed by the fuel and air injected into the cylinder cannot be burned partly, and the exhaust pipe emits white smoke. Therefore, after the locomotive starts, attention should be paid to the insulation of the water tank, and the middle throttle is used to run so that when the locomotive temperature reaches more than 50 degrees, the load is gradually increased.

2. There is water in the diesel and water in the diesel, which directly affects the normal combustion of the mixed gas and emits white smoke. At this time, the precipitated oil should be released, the stagnant water should be discharged, and the diesel fuel should be replaced if necessary.

3. If the exhaust pipe continues to emit white smoke, it may be that the cylinder head and cylinder gasket of individual cylinders are damaged and water is ingressive, so it should be removed for inspection and replaced with damaged cylinder heads and cylinder gaskets. In addition, if the intake valve is not closed tightly, white smoke can also appear, which should be inspected and repaired.

1. Causes of black smoke.

1.The flammable mixture is too thick. 2.

There is too much oil in the engine fuel. 3.Poor piston ring or crankshaft oil seal sealing.

4.There is moisture in the fuel. 5.

Bad spark plug 6The air filter is too dirty.

2. Fault diagnosis and elimination.

1.For the inspection and diagnosis of excessive concentration of combustible mixtures, the carburetor and air filter should be checked.

2.The blend does not compare with the blend of the oil, or the wrong grade of oil is used. If the oil mixture contains too much oil or the oil quality is poor, the oil of the flammable mixture cannot be completely burned, resulting in black smoke.

The above phenomenon can also occur in two-stroke engines with separate lubrication and oil pump misalignment and excessive oil supply. At this time, the oil pump should be checked and adjusted according to the regulations to ensure that the lubricating oil is supplied proportionally at different throttle openings.

3.Excessive wear or breakage in a four-stroke engine, as well as too much oil in the crankcase, can cause oil to string into the combustion chamber and cause excessive oil in the mixture. If the crankshaft oil seal of a two-stroke engine is broken, it will also cause the oil from the transmission to string into the crankcase and enter the combustion chamber with the mixture.

4.One of the reasons for the mixing of water in the fuel is that the fuel in the fuel tank itself contains water, so the fuel tank should be cleaned and the fuel should be replaced. Another reason is that the cylinder gasket of the water-cooled engine is broken, and cold water enters the cylinder.

If, in the absence of leakage, the water in the tank is consumed too quickly, and the exhaust smoke from the exhaust pipe is slightly white, this is mostly the reason and the head gasket should be replaced.

Black smoke from gasoline engines is rare, black smoke is mainly not completely burned fuel in the combustion chamber, in the case of high temperature and lack of oxygen, diesel can not be completely and fully combusted, so decomposition and aggregation to form soot, it is a small diameter of the aggregate.

Because this aggregate reacts much slower than gasified fuel, due to the high temperature and anoxic environment of the combustion chamber, it cannot be fully burned again and is discharged through the exhaust pipe, so black smoke is presented.

The direct consequence of this phenomenon is that the fuel consumption of diesel engines is very high, the power is reduced, and at the same time, a large amount of carbon deposits exist in the piston and piston ring valves. In severe cases, the piston rings will be jammed, the valve seal is not tight, and the air leakage will be accelerated, and at the same time, it will also accelerate the wear of parts, thereby reducing the service life of the engine, so this aspect should be paid special attention.

You can check the oil.

Hello, friend.

This is a more obvious fault of over-concentration of mixture, when the mixture is too thick, due to too much gasoline composition, insufficient oxygen, so the combustion is incomplete, and the muffler emits black smoke. First of all, it was inspected that there was no oil seepage from the throttle shaft and float chamber liner, the oil level height was normal, and the choke could be fully opened, so the carburetor was removed for cleaning, inspection and adjustment. Cleaning blows through the low-speed measuring holes, first.

One and two main measuring holes and needle valve seats, found that the power piston is stuck below, loosen the retainer screw, remove the power piston and spring, the power piston groove and the piston are covered with oil scale, if the power valve is not well sealed, the air-fuel mixture used for the main high-speed circuit will be too thick, wasting fuel. If the power piston is not sealed around, or the vacuum path is blocked, the power piston will be kept below, so that the power valve has been open to supply oil, and the air-fuel mixture is too thick, which not only wastes gasoline, but also makes the engine unable to completely burn the work, so that the exhaust pipe emits black smoke and pollutes the air. If the power piston is stuck in the upper part, the power valve will not open (i.e. the power circuit will not work), resulting in poor acceleration and insufficient power.

If the power hole is blocked, even if the power valve is open, the gasoline cannot be sent to the first high-speed circuit, and the result will be poor acceleration and insufficient power.

You can carefully clean the power piston, power valve and power hole, and blow the power valve, power hole and oil circuit with high-pressure air. After the installation and commissioning, the exhaust pipe does not emit black smoke and there is no abnormal smell, you can.