JAC Ruiying 1 9T diesel version of the engine after the overhaul, how to do the dry sound and black

There are strict standards for engine overhaul, and the following is an important "indicator" for engine overhaul, and the engine is going to be overhauled on the surface of these signs.

1.Cylinder pressure difference: The cylinder compression pressure should meet the original design regulations, check that the tachometer and cylinder pressure gauge do not meet the requirements and are unqualified, and the pressure difference between each cylinder is unqualified

The difference between the pressure of each cylinder and the average pressure of each cylinder is not more than 8 measured with a tachometer, cylinder pressure gauge or with an engine comprehensive analyzer (the pressure difference between each cylinder of Yuedong engine that does not meet the standard is unqualified.) When the cylinder pressure of the Yuedong engine is lower than its standard value, there will be serious black smoke.

2.Large fluctuation of idle speed: the engine is stable at idle speed, and its speed meets the original design regulations. The speed fluctuation is not more than 50r min, and the operation test is carried out with the tachometer or measured with the engine comprehensive analyzer.

3.Low power: the maximum power of the engine shall not be lower than 90 of the original design calibration value, and the dynamometer shall be measured according to the relevant regulations.

4.Fuel consumption rate: The minimum fuel consumption rate of the engine shall not be higher than the fuel consumption meter required by the original design.

5.Low torque: the maximum torque of the engine shall not be lower than 90 of the original design calibration value.

The timing mark is incorrect, and the ignition time is too late.

The injector is not corrected properly.

Under normal circumstances, the basic reason for the black smoke of diesel engines is: insufficient and incomplete fuel combustion. The reasons for this incomplete combustion are mostly due to the uneven oil supply of each cylinder, poor atomization of diesel combustion, excessive oil supply to each cylinder, insufficient air intake in the suction system, or too early injection time

The appearance of black smoke for a long time indicates that something is wrong with the diesel car, and the following are some ways to solve it:

1. When the gas supply is insufficient, black smoke is easy to occur. At this point we need to remove the air filter.

Observe the exhaust smoke color, if the smoke color is normal, it means that the air filter is too dirty, and the replacement of the air filter can solve the problem.

2. Generally speaking, poor diesel quality will lead to inaccurate fuel supply of fuel injectors, blockage and wear, you can replace the solenoid valve and better quality diesel to try, if it is solved, it means that it is a problem in these two aspects.

3. Sometimes, it may also be caused by the poor quality of the fuel filter or the limit of use, which cannot effectively filter out the moisture and impurities in the diesel fuel, so you can replace the fuel filter to try.

4. When the engine is running, the oil cut-off test is carried out cylinder-by-cylinder. When a cylinder is cut off, the engine speed decreases, the black smoke decreases significantly, and the knocking sound becomes weaker or disappears, which means that the cylinder is caused by excessive oil supply.

5. Finally, it may be a diesel engine.

If the gap between the pistons becomes larger, it will be more troublesome, and the only way to repair it is to go to the maintenance point.

Is the black smoke dealt with?

There is a lot of black smoke in the exhaust of the diesel engine, which is mostly caused by the incomplete combustion caused by the uneven or excessive oil supply of each cylinder, the insufficient amount of inhaled air, the poor atomization, and the early injection time.

1) Remove the air filter and observe the exhaust smoke. If the situation of black smoke exhaust improves, the fault is caused by the serious dirt of the air filter;

2) Check whether the oil supply time is too early, if it is too early, it should be adjusted;

3) When the engine is running, the oil can be cut off from the cylinder by cylinder. When a cylinder is cut off, the engine speed decreases, the black smoke decreases significantly, and the knocking sound becomes weaker or disappears, indicating that the cylinder has too much oil. If the engine speed changes small and the black smoke disappears, it means that the injector spray quality of the cylinder is poor.

Once the faulty cylinder is located, disassemble and inspect the injector. If necessary, you can replace the new injector for comparison, if the fault disappears when the new injector is used, it means that the original injector is faulty.

When the fault can not be eliminated by the above method, if the plunger tappet of the fuel injection pump has an adjustment screw, it should be checked whether the fuel injection of each cylinder is consistent, and the adjustment should be made if necessary.

When checking whether the oil supply of the fuel injection pump is too large and the unevenness of the oil supply meets the standard, it should be carried out on the test bench.

Summary. Hello. This is caused by the poor working of the engine, and this is the need to check whether the fuel injection nozzle is too large.

There is also a broken EGR valve caused by blockage, the air flow sensor is damaged will also be affected, this is the impact, you need to take a look, there is a three-way catalytic blockage will also affect the power, you need to go to the repair shop to check the items I summarized for you above, and then check and repair the problem can be solved, to prevent problematic driving affecting comfort and safety. Hope mine is helpful to you.

Hello. This is caused by the poor working of the engine, and this is the need to check whether the fuel injection nozzle is too large. There is also the EGR valve is broken and blocked, and the air flow sensor is damaged, which will be affected, you need to take a look, and there is a three-way crushing and rolling blockage will also affect the power, you need to go to the repair shop to check the spring check the items I summarized for you above, and then check and repair the problem to prevent problems from affecting comfort and safety.

I hope my help to you.

Ruifeng dragged a few hundred pounds, how could he break into the block.

Check the injector, EGR valve.

The valves are all pulled out, and the fuel injector is the biggest problem.

The injector is a big problem. It can be taken to correct the same.

A friend told me that it would be better to remove the power of the EGR valve, is it true?

It would be better, you can plug the EGR valve directly with a mat. Same effect.

There are a lot of problems with Ruifeng diesel cars! Isn't it?

It's still a lot, and the reliability is a little worse.

How's the car going?

The car is that you are driving, and I don't see it, so I can't tell you. I kind of regret buying this car.

Anyway, there are still more problems.

Let's put it bluntly. When a domestic car travels about 100,000 km, it needs to be overhauled. Imported vehicles can be overhauled after driving more than 150,000 km.

After a major overhaul, the engine's performance can be restored to more than 90% of its previous performance. However, it is not necessary to overhaul the mileage, and it is generally based on meeting the requirements of 100,000 km of domestic cars or 150,000 km of imported cars, and the following aspects are carried out:

Inspection of engine overhaul:

1.When the oil consumption is serious and the engine is weak, there is no oil leakage.

If there is an oil leak, it is likely to be caused by aging of the valve seal, or it may be caused by the notched alignment of the piston rings. In both cases, the overhaul of these two auto parts groups should be prioritized before deciding whether an overhaul of the engine is required.

2.When the engine has an abnormal noise.

If the engine is found to have a severe knocking sound or if the engine has severe ablation of the size of the pad and the crankshaft is severely worn, an overhaul should be considered.

3.When the cylinder is worn to the overhaul standard.

Regardless of the phenomenon of the car, the final decision on whether to overhaul the standard time of the cylinder wear amount, the cylinder out of circle to reach every 100mm bore wear, or the cylinder cone wear to reach every 100mm bore wear, as long as one of these two conditions is met, should be considered for overhaul.

Overhaul is not equal to major repair, overhaul is a proper term in the automobile repair industry, with its fixed items and costs, of which boring cylinder is one of the main items. The maintenance cost of car overhaul is relatively high in car repair. Hyundai Motor Overhaul Engine is the repair project with the most complex maintenance process, the most maintenance tools and equipment, the longest man-hours, and the most precise degree of standardization of maintenance technology.

1. Reasons.

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.

The mixture is too concentrated and the combustion is incomplete.

Black smoke from the car:

The mixture is too thick.

Fault phenomenon: black smoke comes out of the engine exhaust pipe when the car is driving, and the exhaust pipe has abnormal noise.

Causes of failure: 1. The ignition timing is inaccurate, which will also make the mixture incomplete; Or if a few cylinders of the engine do not work, there will also be a small amount of black smoke discharged.

2. The mixture is too concentrated, that is, the excess air coefficient of the mixture in the cylinder is too small, the combustion is incomplete, and part of the fuel is decomposed into free carbon at high temperature and discharged from the exhaust pipe, resulting in black smoke.

Troubleshooting: 1. If a small amount of black smoke is discharged from the engine exhaust pipe, accompanied by a rhythmic "sudden" sound, it can be concluded that it is caused by a small number of cylinders not working or ignition timing inaccuracy. You can use the cylinder-by-cylinder disconnection method to find out the non-working cylinder, or check and correct the ignition timing.

2. If a large amount of black smoke is discharged from the engine exhaust pipe, accompanied by the sound of firing guns, it can be concluded that the mixture is too thick. Check whether the choke is fully opened in time, and carry out high-speed maintenance if necessary; After the flameout, look at the main nozzle from the carburetor mouth, if there is oil injection or oil dripping, the oil level of the float chamber is too high, it should be adjusted to the specified range, and the main measuring hole should be tightened or replaced; The air filter is clogged and should be cleaned or replaced.

1.For novices, turning off the engine halfway is not a new topic, and the main elimination method is to improve their driving skills after quickly running in.

2.Use high-standard, high-quality and qualified fuel.

3.Thoroughly clean the oil circuit, including the fuel injector, throttle, fuel tank, etc. It may be that the quality of the oil you add is not up to standard, there is too much grease, the oil path is blocked, and the oil attack is not smooth.

4.The main reason for the failure of the car in the idle state is that there is too much dust in the air, and there is a lot of dirt deposited at the idle motor valve core and throttle seat when the engine is running. The solution to this problem is simple:

Just clean the idle motor.

5.Whether the oil circuit is smooth or not, it is also easy to cause the engine to stall halfway.

6.Due to the price of oil**, coupled with the return of many people's hobby – cycling. Walking to work increases, so the new car appears to be parked for a long time without use, in fact, do not park for a long time. In case it is parked for a longer period of time, it should be before reuse.

Do a thorough maintenance and change the oil. machine filter, etc., and check the fuel as appropriate. circuits, etc. It is possible that your vehicle is due to lubrication or electrical problems due to prolonged parking.