✅ Kamaz smokes white smoke - Causes and consequences. Toptekhnik.ru

Category: KAMAZ

What does the KamAZ exhaust indicate?
KamAZ smokes white smoke reasons
KamAZ smokes black smoke reasons
KamAZ smokes blue smoke reasons
Results

During operation of the power plant, a frequent occurrence is the abundant release of exhaust gases and the KamAZ smokes. For a working engine, this behavior is typical when starting, but it goes away after a short period of time. If not, the symptom indicates problems in the condition of the unit. The sooner the reason why the KamAZ smokes is identified and eliminated, the longer the engine will last.

KamAZ 6520 (dump truck):

Kamaz smokes white smoke - Causes and consequences

The products of the Kama Automobile Plant, located in Naberezhnye Chelny, entered everyday life, became popular and distributed in forty countries.
Mass popularity is the reason that the incorrect behavior of technology arouses consumer interest. During operation of the power plant, a frequent occurrence is the abundant release of exhaust gases and the KamAZ smokes. For a working engine, this behavior is typical when starting, but it goes away after a short period of time. If not, the symptom indicates problems in the condition of the unit. The sooner the reason why the KamAZ smokes is identified and eliminated, the longer the engine will last.

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What does the KamAZ exhaust indicate?

Car exhaust, an indicator of the condition of the power plant. As already mentioned, the KamAZ diesel engine does not smoke under normal conditions. Otherwise, analysis of emissions (smoke color) will answer the question about the condition of the motor. The indicator will indicate the exact cause of the breakdown, the degree of wear and condition of the components. Damage to injectors and fuel pressure pump.

Exhaust is the remains of unburned fuel coming out in the form of gas. Visually, the emission products are visible at sub-zero temperatures, then the smog is presented in the form of steam.

When KamAZ operates, there is exhaust of the following colors:

White issue, with an admixture of black and gray tones;
Blue edition, with an admixture of gray tone;
Black exhaust, with soot emissions.

KamAZ smokes white smoke reasons

The white tone of the power plant exhaust is caused by both harmless reasons and reasons that require urgent solutions. In order not to doubt the technical condition of the vehicle and avoid an unpleasant situation, it is necessary to determine as soon as possible why the KamAZ is smoking white smoke.

Causes of white exhaust:

Formation of condensation in the exhaust system.

This is a harmless phenomenon. The moisture accumulated during parking evaporates as the power plant heats up, steam particles mix with oxidation waste and color the exhaust, making it white. When the remaining condensation evaporates, the phenomenon will disappear.

KamAZ smokes white smoke:

Partial oxidation of the working mixture

Consequence of supply disruption and failure of combustion of the fuel mixture in the chamber. This behavior is characteristic of a corrected engine in the cold season, when the engine has not warmed up and is idling. After the engine has warmed up, the exhaust is not noticeable, this is considered normal behavior. Otherwise, the problems are as follows:

Mechanical abrasion of the pump, plungers;
A drop in the compression ratio in the cylinder liner;
Increased pumping force of the working mixture.

Malfunctions lead to a delay in fuel ignition due to an incorrect mixture injection angle. Failure to correct the malfunction in a timely manner leads to the fact that the diesel engine does not start, troits, and jerks. Characteristic signs: decreased acceleration dynamics, decreased power, increased fuel consumption.

Coolant entering the positive displacement chamber.

A dangerous scenario. Getting into the KamAZ cylinder liner, the coolant forms a compound containing sulfur, which negatively affects the service life of the engine. Liquid in the cylinders will lead to hydraulic shock, which will destroy the piston group, resulting in complete failure of the power plant.

Consequences of water hammer KamAZ:

A cooler in the piston space indicates a problem:

Block seal failure;
Microscopic rupture in the block or in the motor head;
Damage to the intake manifold seal.

Remember that it is advisable not to use the engine until the problems are resolved. Otherwise, the situation will worsen and the consequences will be irreparable. You can also read about Kamaz Heating - Causes and Consequences.

KamAZ smokes black smoke reasons

Black smog from a car exhaust indicates incomplete combustion of the mixture.

The reason why KamAZ smokes black smoke is:

Excessive supply of diesel to the positive displacement chamber

.The high-pressure pump (HHP) is responsible for supplying diesel fuel to the engine cylinder. Therefore, problems are associated with the operation of this unit, these include:

Excessive wear of pump nozzles.

For this reason, fuel does not enter the cylinder evenly, with reduced pressure.
Failure of diesel supply settings in the fuel pump.
Diesel fuel is supplied to the chamber either delayed or advanced.
Worn speed control device.

The first symptoms are that the engine does not maintain constant speed and does not operate reliably.

KamAZ smokes black smoke:

Supplying the engine with inappropriate diesel fuel.

Diesel that does not meet the required quality interferes with normal combustion. An increased sulfur content and a diesel engine that does not meet the detonation resistance rating lead to increased engine wear.

Lack of air during fuel combustion.

The reason is that the air filter element has become unusable, or the exhaust gas bypass valve is broken.

Discrepancy between the diesel flow rate supplied to the chamber and the air flow rate pumped by the compressor. To troubleshoot problems, adjust the smoke corrector on KamAZ.

In engine acceleration modes, the amount of diesel supplied increases faster than the amount of air. As a result, a lean mixture is formed that does not burn completely. The automatic anti-smoke corrector adjusts the air-fuel ratio, and the presence of black smoke indicates a settings failure.

Unburned fuel

This guess will be confirmed by the presence of a pungent and pungent odor from the exhaust system. This will mean that the unburned fuel comes out along with the smoke in a vapor state.

Fuel may not burn out for various reasons. It is possible that the fuel is supplied too late or that some cylinder does not cope with its task and cannot burn diesel fuel.

As a rule, every effect has causes. The consequence, in this case, is unburned fuel and, as a result, the diesel smokes blue. So what are the reasons and malfunctions in diesel components that can lead to this?

Injection pump faulty

If the cause of blue smoke is a delayed injection, then you should pay attention to the wear of the high pressure fuel pump (HPF). It is easy to guess that the fuel will not have time to burn out if it is supplied late.

So, we have decided on one of the possible culprits. But why does this happen? The design and operation of the injection pump is quite complicated. To explain in simple words, the operation of this unit is based on the movement of special mechanisms for supplying fuel, which constantly rub and contact each other.

The fuel itself serves as a lubricant for the parts. Quite a tricky solution, because diesel fuel has a greasy structure. But with the arrival of winter, a transition to winter fuel is made.

It is called winter because its viscosity is reduced, namely, those same lubricating fractions are missing or their quantity is not enough to lubricate the “hardware” in the pump. This is what causes the fuel injection pump to wear out. And the wear of this part of the unit, in turn, along with the profile of the wave washer, causes a delay in fuel injection.

The mechanism is as follows: the fuel does not have time to heat up because it is supplied late, and the cylinder begins to work poorly with surges. As a result, the fuel that does not have time to burn is released outside in the form of blue smoke.

If you warm up the engine after driving a few kilometers, the bluish trail behind the car will disappear or decrease so much that it cannot be traced. But pump problems will not be corrected by this. When the engine is warm, even fuel supplied late has time to burn almost completely due to the high temperature background.

Poor engine compression

There are times when strong blue smoke comes out when starting the engine. And then after proper warming up the smoke disappears. This picture is quite common in the courtyards of our country, when there are columns of smoke, and the driver is running, clutching his head, and cannot understand what is happening.

The reason for this is low engine compression. Due to this defect, the temperature during compression does not reach the required value, so the fuel does not burn out completely. Even if the engine has one cylinder with low compression, the operation of such an engine is possible. But it will smoke until the overall temperature rises and the faulty cylinder begins to cope with the incoming fuel and ignite it.

Blue smoke can be caused by untimely injection or low compression. By the way, most modern diesel engines are equipped with a device on the fuel pump that performs early injection when the engine is still cold.

With this function, the engine runs harder, but the fuel has time to burn completely. The engine heats up, and the device returns fuel injection to its initial state, the engine begins to “purr” and becomes pleasant and soft to the ear.

KamAZ smokes blue smoke reasons

When analyzing exhaust gases, attention is paid to the smell accompanying the exhaust. The indicator is especially important if the exhaust is blue.

The causes of blue smoke are:

Uneven distribution of the fuel mixture by volume. With this phenomenon, blue exhaust is accompanied by a strong odor. The fact is that the diesel in the cylinder burns partially. The unused mixture is simply thrown into the pipe. Burnt fuel ignites on the surface of the piston and head, overheating the parts. Such a process, sooner or later, leads to damage to the pistons and melting of cylinder parts.

The reason for the phenomenon lies in faulty fuel equipment of the KamAZ diesel unit. Usually there is a problem with the fuel pump or injectors. Blue exhaust also appears at the initial stage of warming up the installation, here we are talking about the failure of the electric heating element, or a decrease in the seal in the chambers.

Diagnosis and localization of the problem

In the first case, the exhaust is blue, pungent, and has a pungent odor. The reason is that only well-atomized diesel fuel burns in the cylinder. Drops of unburned diesel fuel fly out of the exhaust pipe in a vaporous state. The other part of the drops burns inside the cylinder, but on the piston itself. This causes severe overheating of the piston, which can lead to melting or burnout.

The culprit of the malfunction turns out to be the fuel equipment of the diesel engine. Often the problem lies in the injection pump and diesel injectors. Smoking from the bluish exhaust when the diesel engine is warming up indicates a malfunction of the glow plugs or a drop in compression in the cylinders.

In the second case, the exhaust takes on a color from whitish-blue to dark blue. The color of the exhaust directly depends on the amount of oil penetrating into the combustion chamber, the operating mode of the internal combustion engine and the degree of engine warming up. The smell of exhaust with a lot of oil is burnt, such smoke takes a long time to dissipate in the air.

The appearance of oil smoke is accompanied by an increase in engine oil consumption. During operation of the internal combustion engine in transient modes, the smoke with impurities of burnt oil is thicker. The catalyst (catalytic converter) of gasoline engines cleans the exhaust of oil even at high consumption. On diesel internal combustion engines, oil exhaust is more noticeable.

Results

The first thing that is done when smoke is detected from a KamAZ engine, regardless of what color the exhaust is, is: filters are changed, injectors are cleaned, and the fuel supply is adjusted. Sometimes these actions are enough to restore normal operation. In serious cases, intervention is performed on the power plant.

KamAZ, air filter:

Remember, the sudden appearance of black smoke from the engine exhaust pipe is often caused by KamAZ fuel of inappropriate quality. Replacing the fuel will solve the problem; further use of the engine on this diesel engine is prohibited.

Monitoring the condition of the belt driving the gas distribution mechanism. Adjustment of thermal clearances of valves, phases, marks, diagnostics of glow plugs. These actions will help optimize engine life and minimize operating costs.

When you shouldn't worry about white smoke

First of all, you need to know that white smoke is normal and has no negative effects. If the white smoke from the chimney is a small amount, there is no need to worry when the smoke disappears after driving the car for a few minutes.

This situation is similar for both diesel and gasoline engines. In the first case, this is because when diesel is cold, it may have difficulty burning fuel. On the other hand, gasoline cars emit white smoke when starting up in winter because the remaining water that is in the exhaust pipe evaporates.

If this is not the case, you need to look into it, because most likely the car has some mechanical problems.

Filters

You know, the last reason could be faulty (clogged) engine air filters. I also thought that this was not possible - but it is a fact! The thing is that there is less air (dirty filters do not allow it to pass), but there is more fuel, and the “smoke” increases. But here, not only white but also black exhaust can appear. But this is a topic for another article, be sure to follow our blog.

In the end, I want to say - if you have such a “whitish fog” effect in winter, the fluid level does not drop, then this is normal! You shouldn't even pay attention to this.

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When to worry about white smoke

In diesel and petrol engines, white smoke may be normal, as discussed earlier, as long as it is not in small quantities and disappears quickly. To know the exact cause of this white smoke, you need to know what situations can cause white smoke:

The smoke is white and thick when starting a diesel engine

After filling up a diesel car, once you start it, it emits a lot of white smoke and it takes time to disappear, the car has a problem with the diesel injection or any heater.

This problem is caused by the fuel pump injecting fuel too quickly and the engine only burning a small portion, causing the rest to evaporate through the exhaust pipe. If a diesel car does not have an injection pump, the problem is that the combustion chamber is very cold and has some problems with the heaters.

White smoke when starting and driving

If the smoke persists for a long time after starting the car, it is more likely that it has a cooling problem that is affecting the cylinder head gasket. Antifreeze enters the cylinder, mixes with the fuel, and this causes white smoke that can be seen in the exhaust pipe.

The cylinder head gasket will have to be replaced, which is not a cheap repair. If the smoke is bluish in color, this may also mean that oil is entering the combustion chamber.

Very thick white smoke while driving

This is the most serious problem due to the fact that the engine coolant is burned. This failure implies a serious problem with the head gasket or even a crack in the engine block itself, two repairs that are very expensive (especially the latter).

If the described situations occur, you need to repair the car immediately. The longer this happens, the worse the problem will be and the more expensive it will be to fix. In fact, the damage to the engine may be so severe that it becomes unusable.

While repairing a cylinder head can be expensive, it is much more expensive to fix a crack in the cylinder block or replace it entirely. The sooner this problem is solved, the less you will have to spend to stop the car from pouring out white smoke when starting.

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Increased oil consumption after overhauling the Cummins engine

Very often, increased oil consumption is observed immediately after a major overhaul of a Cummins engine. Sometimes this is normal when it comes to break-in. But sometimes the reasons lie in poor-quality engine repairs.

Many capital owners try to save on replacing pistons and only change the rings. During a major overhaul, it is always necessary to check the pistons for wear, and if the permissible parameters are exceeded, replacing the pistons is a prerequisite for further normal operation of the engine.

Also, during a major overhaul for wear, it is necessary to measure not only the pistons, but also the cylinders. Even if there are no visible scuffs on the cylinders, the walls may be severely worn and installing a new piston group in this case will not lead you to success. In this case, the problem is solved by lining the cylinder block or boring it for repair pistons.

White smoke from the exhaust pipe of a diesel engine

In order to diagnose the normal operation of a diesel car engine, it is enough to pay attention to the color of the exhaust gases of the power unit. Based on the color of the smoke from the exhaust pipe, it is possible to accurately diagnose the condition of the power unit. This will make it possible to replace worn parts in a timely manner and prevent more serious malfunctions:

piston group;

gas distribution mechanism;

failure of the power unit injectors;

Injection pump.

Smoke from a car chimney is a product of combustion of a mixture of fuel, which after processing turns into gas. If a properly tuned diesel engine is perfectly tuned, the exhaust may only be visible in the form of white water vapor in the winter. If negative changes occur in the internal combustion engine, then the color of the diesel engine exhaust lets you know about engine malfunctions. The color of the exhaust varies. It is he who gives us information about the nature of a possible engine problem. Depending on the malfunction, the color is:

thick black, such smoke contains a lot of soot;

white, with a gray tint;

grayish-blue, similar to gray.

It's all about oil

With this diagnosis, the “cloud” from the exhaust pipe will smoke from light to dark shades. It will depend on the concentration of oil that flows into the combustion chambers, engine operating conditions and warm-up temperature. At the same time, you will feel the burnt smell characteristic of the oil.

The appearance of such gas will be indicated by increased oil consumption. To solve this problem, you need to decide on suppliers of “unnecessary” fluid.

Wear of the cylinder-piston group

Very often, a diesel engine produces bluish smoke due to wear of the cylinder-piston group and timing components (gas distribution mechanism). Oil can get into the cylinder for several reasons.

The piston ring clearances have been increased.
The gaps between the valve stems and guide bushings have been increased.
There is damage on the cylinder liner.
The rings are destroyed.
There are violations of the piston grooves and many other reasons.

For example, severe gap defects in the area of the piston grooves allow the combustion chamber to “suck” oil. This is possible even if the oil scraper rings are in good condition. With a long period of operation, the cylinders can change their shape, for example, become elliptical. Due to changes in shape, compaction deteriorates.

Wear of this group of parts also causes a decrease in compression. When measuring compression, it is worth taking into account the ability of the oil to seal gaps. It turns out that if the cylinder is faulty, then the compression should be too high. To carry out diagnostics of the CPG (cylinder-piston group), take measurements and obtain an accurate assessment, certain requirements must be met.

If the mechanisms do not have a very large deterioration in quality, then the notorious smoke can be seen when the engine warms up. After warming up, the level of the symptom decreases or disappears completely. This is explained by the fact that at high temperatures the parts expand and the gaps become sealed.

Reasons why the engine emits white smoke

Fuel enters the diesel unit by injection into the cylinders through injectors. As diesel fuel moves, a fuel mixture is formed inside the injectors. As a result of this phenomenon, diesel fuel is evenly distributed in the space of the engine cylinder into small particles. Then, these microscopic particles of fuel in the cylinder heat up and begin to actively evaporate.

A four-stroke engine running on diesel fuel, in fully working order, should produce exhaust gases that are completely colorless. This should be so for one simple reason: the atomized portion of diesel fuel exactly corresponds to the norm for a cylinder of a given volume. Its injection through the injectors occurs at the moment of maximum compression, which contributes to the complete combustion of the fuel mixture. As a result of precise operation, the diesel power unit produces maximum power. If the engine starts to smoke white, it means that the following negative changes have occurred:

the humidity in the diesel engine has increased significantly;

not all of the fuel mixture burns;

Coolant in the cylinders.

The reason is condensation

For a diesel engine that is warming up, white smoke is not a rare phenomenon and is quite acceptable. The whole problem is in the water that condenses in the exhaust pipe after the car is idle. When the car engine starts, some of the water is pushed out by the exhaust gases. Water drips from the pipe. It looks like water has been added to the diesel fuel. The remaining water evaporates when the pipe is heated. In warm weather this is not noticeable. It's a different matter in winter. At sub-zero temperatures, the engine warms up longer, therefore, the steam formation process is delayed. Therefore, when the engine warms up, white smoke is visible coming out of the exhaust pipe. It should be noted that this applies not only to diesel engines, but also to gasoline engines.

White smoke from exhaust cause

Most problems that cause white smoke from the exhaust pipe are caused by engine overheating or poor fuel supply. By paying attention to the shade of smog, its smell and the general behavior of the car, you can accurately determine the cause of the smoke. The most common are:

Presence of moisture.
Presence of water in fuel.
Incorrect operation of the injection system.
Incomplete combustion of fuel.
Coolant entering the cylinders.

It is worth noting that some of the reasons why dangerous white smoke appears from the exhaust pipe of a diesel engine and the exhaust pipe of a gasoline engine may have different origins, so let’s deal with everything in order, and separately.

White smoke from the exhaust pipe of a diesel engine

White exhaust during the warm-up mode of a working diesel engine is quite normal. But after the engine has reached operating temperature, such smoking may indicate:

Condensation in solarium.
Incomplete combustion of diesel fuel.
Fuel overflow due to malfunction of injectors.
Coolant leaking into the manifold.
Low compression.

To diagnose a specific cause, you need to follow a few simple steps:

First, check the color of the smoke , is it pure white or has some tint (bluish smoke will indicate burnt oil).
Secondly, check the coolant level for the presence of exhaust gases and the presence of oil in the cooling system.

A whitish-gray exhaust when warming up may indicate untimely ignition of the mixture . This color of smoke indicates that the gases that were supposed to push the piston in the cylinder ended up in the exhaust pipe. Such smoke, as well as with the evaporation of moisture, disappears after warming up, if everything is in order with the ignition of the car.

Symptoms of a burnt cylinder head gasket

The presence of thick white smoke even after warming up indicates that coolant has entered the engine cylinder . The place where liquid penetrates can be either a burnt gasket or a crack . You can check the theory of coolant entering from the cooling system in this way:

opening the cap of the expansion tank or radiator, you will see an oil film;
you may smell exhaust gases from the tank;
bubbles in the expansion tank;
the fluid level will increase after starting the engine and decrease after stopping it;
Pressure increases in the cooling system (can be checked by trying to compress the upper radiator hose when starting the engine).

If you notice signs of coolant getting into the cylinders, then further operation of the faulty engine is not recommended , since the situation can quickly worsen due to a decrease in the lubricating properties of the oil, which gradually mixes with the coolant.

Antifreeze in engine cylinders

What to do if the engine smokes when cold

If, after a long period of inactivity, the machine smokes heavily, and after a while it stops, then the check must be performed according to the following algorithm:

Estimate the mileage of the car's engine, and also remember what kind of engine oil is poured into the crankcase and how long ago it was changed. Accordingly, if the engine is worn out and low-viscosity oil is poured into it, then it makes sense to replace it with a thicker one. Along with changing the engine oil, do not forget to replace the oil filter, and it is advisable to use the original filter. If the oil is old and the engine has a high mileage, then before directly changing the oil, it is advisable to flush the oil system.
The appearance of bluish or black smoke on a cold engine is a reason to check the compression and condition of the piston rings. If the compression is low, you need to find out the reason. In some cases, the cause can be eliminated by decarbonizing the rings. Along with decoking, it is also advisable to pour flushing oil into the engine for cleaning purposes, and then change the oil to a new one, but taking into account the viscosity according to the condition of the engine and its mileage. If there is consistently high oil consumption, then it makes sense to change the piston rings.
Check the condition of the valve stem seals. This is a fairly common reason why a car smokes when cold. For domestic cars, the approximate mileage before the next replacement of caps is about 80 thousand kilometers. For foreign cars, taking into account the use of high-quality oil, this mileage can be two to three times longer.
Perform a sensor check using a scan tool. If it shows an error in any of the nodes, then you should treat it more carefully and replace it.
Check the oil level and condition. An increase in volume or a change in color may indicate the presence of antifreeze. If the level of one of the liquids decreases, you need to perform additional diagnostics - check the valve stem seals, rings, and cylinder head gasket.

For owners of diesel engines, in addition to the above recommendations, it is also advisable to perform several additional procedures.

If, in addition to smoke after starting, the engine also “troubles”, then you need to check the condition of the fuel injectors. If you identify a faulty or contaminated injector, you must first clean it, and if this does not help, replace it with a new one.
Check and, if necessary, clean the EGR.
Check the operation of the high pressure pump, check valve and the fuel line as a whole for fuel leaks.

Conclusion

According to statistics, in approximately 90% of cases, the reason that a car smokes when cold is faulty valve stem seals. Therefore, first of all, you need to check their condition. After this, you need to check the condition of the piston rings, viscosity and general condition of the oil. It would not be superfluous to diagnose the control unit for errors. The fastest way to diagnose and find out the origin of the smoke is to use an ordinary sheet of white paper near the exhaust. By the traces and smell remaining on it, you can quickly determine what is entering the combustion chamber - liquid, fuel or oil.

Source

White smoke from the exhaust pipe of a gasoline engine

As stated earlier, the release of white steam from the exhaust in cold and humid weather is a completely natural phenomenon; before warming up, you can even see it dripping from the muffler, but if the engine is at an optimal temperature, and steam continues to escape, then you can be sure that the engine there are problems.

The main reasons why white smoke comes out of the exhaust pipe of a gasoline engine are:

Leaking coolant into the cylinder.
Injector malfunction.
Low-quality gasoline with foreign impurities.
Burnout of oil due to the presence of rings (smoke with a tint).

The reasons why white smoke may appear from the exhaust of a gasoline car may only partially differ from those affecting a diesel engine, so we will pay more attention to how to check exactly why the smoke began to pour out.

Why does crankcase pressure increase?

Having noticed oil leaks in the engine compartment and/or a decrease in the oil level in the crankcase, it is necessary to accurately determine that the diesel engine is breathing. This can be done in the following way. It is enough to unscrew the oil filler cap on a warm diesel engine. If you notice bluish smoke coming from the throat, then the problem is obvious.

Cylinder piston group and cylinder head

The main reason that a diesel engine is breathing is the wear of the cylinder-piston group. During the operation of the internal combustion engine, scuffs form on the cylinder walls, the cylinders themselves gradually break and acquire a changed shape of the walls, and the piston rings wear out or break. As a result of heating, the thermal gaps between the piston and the cylinder walls become too large.

If the diesel engine is very worn out, then a major overhaul is necessary, which will mean boring the cylinders, replacing pistons, rings, etc. Accurate diagnosis of CPG problems requires measuring compression to determine the spread of indicators across the cylinders.

In the event that the diesel engine does not breathe much and the malfunction is only at the initial stage (wear of the cylinder walls is within acceptable limits), some auto mechanics resort to the method of decarbonizing the piston rings. This measure is considered temporary, since further long-term operation of the unit after decarbonization of the rings should not be expected. The best solution would be to replace the rings with new ones.

A diesel engine can also vent due to wear of valves, guide bushings, valve seals, etc. Similar to piston malfunctions and ring decarbonization, timing problems can only be effectively eliminated by comprehensive repairs. Replacing valve seals alone does not have a lasting effect.

Engine crankcase ventilation system

Second on the list of main reasons why a diesel engine is breathing is a clogged crankcase ventilation system. The symptoms of a decrease in the throughput of this system resemble wear of the CPG: increased consumption of engine oil, diesel smoking with blue smoke, etc. In some cases, it is possible to normalize engine operation and eliminate excess oil consumption by cleaning the breathers.