Operating principle of SVKG
Car engines have a ring gas exhaust system. The resulting gases as a result of the combustion of diesel fuel, gasoline or liquefied gas are not released into the environment, but are returned to the engine, where they are re-burned. The second end of the crankcase ventilation hose is attached to the intake manifold, with the help of which gases again enter the cylinder chamber for combustion. A significant part of the gases, when re-entered, ignite at the moment the fuel ignites, and the remaining ones are released into the atmosphere using the exhaust system. A small percentage of the gases are sent back into the cylinder chamber for re-combustion. This process is ongoing.
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DIAGRAM OF THE STANDARD Crankcase VENTILATION SYSTEM
The crankcase ventilation system of VAZ engines consists of two circuits that operate at different load modes and speeds:
- The small ventilation circuit
is connected to the valve cover and the intake manifold (behind the throttle body). This connection diagram provides intensive crankcase ventilation due to the vacuum that occurs in the intake manifold when the throttle is closed. To avoid an effect such as hyperventilation, the cross-section of the small circuit is limited by a jet in the cable throttle body with a diameter of 1.7 millimeters. This circuit operates in the region of 800-1500 rpm. - A large ventilation circuit
is connected to the valve cover and the air pipe (in the pre-throttle space). This scheme provides intensive crankcase ventilation at high speeds. The cross section of the large contour is 16-18 millimeters
Examples demonstrating the shortcomings of the standard crankcase ventilation system:
- A car is going down a hill with the gear in gear. In this mode, the engine operates at higher speeds with a reduced load. A high vacuum is created in the crankcase, and a large ventilation circuit is connected, in which there are no control valves. Since both circuits are connected to one volume of the oil trap, a strong vacuum in the crankcase will draw a fresh portion of air bypassing the throttle. The mass air flow sensor will show increased air flow, and the ECU will try to close the throttle. Having realized that this is not possible (it is already closed), the lean mixture will be corrected by increasing the fuel supply (fuel consumption will increase). As a result, the entire internal volume of the engine will work as a parallel receiver of very significant volume, connected to the intake, bypassing the throttle. It is this volume that will interfere with the formation of a high-quality mixture.
- A car in a traffic jam drives under tension with additional consumers (for example, the air conditioner is on). The compressor clutch is connected, the load increases abruptly. The engine does not have enough air, it begins to pull it from the crankcase, bypassing the throttle. But the ECU is also aware of the clutch engagement and also supplies more air by opening the throttle. The vacuum drops sharply, the vacuum brake booster (VBR) does not have enough strength to hold the car. Leap forward. The ECU sees an increase in oxygen and closes the throttle. A sharp increase in vacuum, VUT seizes. The car jerks, the transmission hits. And so on ad infinitum.
As a result
in both cases, when the engine is running, speed jumps occur and the engine choke under the load. Jerking and vibration are possible on manual transmissions, automatic transmissions and automatic transmissions. To eliminate these shortcomings, it is proposed to modify the design according to one of the presented schemes.
Oil flows through the breather, reasons, how to fix the problem
Today we will talk about the crankcase ventilation system and look at the reasons why oil begins to flow through the breather.
Crankcase ventilation system
The power plant of any car is a very complex device, including mechanisms and systems that interact with each other. At the same time, the engine is not a closed hermetically sealed circuit and it also has ventilation.
Crankcase ventilation is a scheme that ensures the removal of gases from internal cavities.
The fact is that during combustion of the working mixture in the cylinders, exhaust gases are formed, which are under pressure, due to which part of them penetrates into the sub-piston space - the crankcase, where it mixes with oil mist and moisture formed as a result of condensation.
This whole mixture is called crankcase gases.
If the engine were sealed, with an increase in the amount of gases in the crankcase, the pressure inside it also increased. Because of this, a breakthrough of gases along with oil through the breather, oil seals, seals or the hole in the oil dipstick is possible.
Based on this, it follows that the main task of the ventilation system is to maintain pressure inside the engine and prevent it from exceeding the permissible norm by removing crankcase gases.
Features of ventilation design, operating principle
The simplest diagram of the crankcase ventilation system used on internal combustion engines previously consisted of only one fitting - a breather installed in the crankcase.
This breather connected the internal cavity of the cylinder block with the external environment, and crankcase gases simply escaped through it into the atmosphere.
But this scheme had one significant drawback - the exhaust gases contained oil particles, which also entered the external environment. And this is not only loss of lubricant and the need for periodic refilling, but also air pollution.
On modern cars the ventilation system is closed. It also has a breather, but a pipe is connected to it, allowing gases to be vented into the intake manifold or air filter housing, from where they enter the cylinders and burn. That is, the atmosphere is not polluted by them.
Additionally, the system includes elements that ensure oil separation and return back to the crankcase so that it does not enter the cylinders along with the gases.
There are several options for oil separators, and on cars from different manufacturers they may differ in design and operating principle.
It is worth noting that part of the exhaust gases enters the supra-valve space, and they must also be removed.
Therefore, the entire circuit of the engine ventilation system on a modern car consists of a breather, an oil separator and two pipes.
Additionally, a special valve can be included in the system to regulate the pressure of gases entering the intake manifold.
The configuration of the system can be very different, but this does not change its purpose and operating principle. For example, consider the ventilation design of the VAZ-2110.
At the bottom of the cylinder block of this car there is a breather, onto which a pipe is attached; the second end of this hose is connected through a fitting to the cylinder head cover. At the same time, an oil separator is located inside this cover at the inlet of the pipe.
On its other side there is another fitting, to which a tube is connected that goes to the air inlet pipe.
The principle of operation of such ventilation is simple - gases enter the cylinder head cover space through the breather and pass through the oil separator, while the separated oil flows to the valve assembly.
After this, the gases are mixed with those that have broken into the supra-valve space and are supplied to the air pipe, and then to the manifold. There is no pressure regulating valve in this car.
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On other machines, the oil separator may be located immediately next to the breather, and a valve is installed behind it.
Signs and causes of oil leaking through the breather
Despite its simplicity, this system is very important, and it is necessary to monitor its performance. One of the most common ventilation problems is oil leaking through the breather.
This can become a serious problem in the future, since oil particles entering the manifold and cylinders will clog the channels, and during combustion, increase the amount of soot, which will then enter the crankcase, coking the oil channels, and impairing the operation of the lubrication system.
PRIORA oil in the air duct
Hello everyone. In general, the client’s car had covered 70,000 thousand miles, with five thousand kilometers, oil appeared in the air duct, ran out from under the valve covers - in general, the engine was all in oil, this did not bother him much - while the oil began to accumulate strongly in the air duct, then it ran through the DMV to air filter. In general, the oil level was enough for 6,000 thousand. I changed the valve seals, piston rings, timing belt, etc. I left. The other day he arrived (5,000 thousand traveled) oil in the air line, pressure is normal, gases do not go into the breather, in principle says it doesn’t consume oil (strains the oil in the air duct) maybe with a separator (on the valve cover) what’s wrong (no wonder oil appeared in the air duct in the first 5 thousand) anyone have any thoughts? The car was taken from the showroom
Symptoms of a Stuck PCV
- Engine misfires at idle
- Lean air-fuel mixture
- Presence of engine oil in PCV valve or hose
- Increased oil consumption
- Hard engine start
- Rough, unstable engine operation at idle
Additionally, a stuck PCV valve can cause a check engine light due to increased air flow. And the diagnostic computer may mistakenly show this error due to the mass air flow sensor or oxygen sensor, making it difficult for you to identify the real source of the problem.
Why is the PCV valve important?
Faulty PCVs can cause engine oil contamination, sludge buildup, oil leaks, high fuel consumption, and other engine damage problems, depending on the type of fault.
While some of these problems can be caught before they escalate with simple checks, failure of the PCV valve or related components often results in costly repairs. This is because most car owners do not include the PCV system in their maintenance routines. Even though some car manufacturers suggest replacing this part regularly, car owners still forget to replace it. Additionally, not all manufacturers emphasize the importance of regular system checks.
Later in this article we will discuss how car owners can test their own PCV valves.
But before we get to that, here's this entire article in a nutshell: what the crankcase ventilation valve does, what happens when it fails, and how to test it.
Why does oil squeeze out through the breather: how to fix the problem
A fairly common problem on many domestic and foreign-made cars is that oil flows through the breather. In winter, especially with the onset of significant cold weather, you can encounter a malfunction when the breather freezes, oil is squeezed out and streaks are visible on the outer surface of the power unit. Let us immediately note that this symptom, as well as smoke and oil from the breather, are a reason for immediate engine diagnostics, since ignoring this problem can lead to quick and expensive engine repairs.
We also recommend reading the article about what a breather is and what its purpose is. From this article you will learn about the design of the engine breather and other components, the principles of operation of the element and other features.
Note that if there is oil coming through the breather, diagnosing the root cause may be difficult. To accurately determine the underlying problem, skills, special equipment, etc. will be required. However, in some cases, the driver can understand why oil is leaking from the breather without the involvement of third-party specialists. In other words, diagnostics are carried out independently in a garage environment. In this article we will talk about why oil drips from the breather, as well as what a car owner should do if oil comes out through the breather.
Breather oil: what to do and how to find the cause
Let's start with the fact that during engine operation, so-called crankcase gases accumulate in the crankcase. To prevent excess pressure from being created, there is a special valve for ventilation. This solution allows the closed crankcase to communicate with the atmosphere. This valve is the breather. In simple words, a breather on an internal combustion engine is actually needed to equalize the pressure inside the engine.
It should be noted that in the crankcase gases mix with oil mist. As a result, lubricant particles enter the breather. Although there is a special oil trap inside the device, a certain part of the oil may escape out. Given this information, minor contamination of the system is acceptable, which is normal. In cases where a lot of lubricant leaks, you should look separately for why oil is leaking from the breather.
Oil leaks through the breather lead to clogged channels, in some cases soot is formed, etc. Excess soot gets into the engine crankcase, and the lubrication system becomes coked. As a result, loaded parts are less well lubricated and engine wear accelerates. Let us add that traces of oil will not necessarily be visible from the outside in the engine compartment. On engines with a carburetor, if there is a leak through the breather, oil in the air filter housing or on the filter element itself is a characteristic sign of a malfunction.
On injection engines, traces of oil getting into the throttle area are noticeable, the power unit also loses its throttle response and power, and fuel consumption increases noticeably. It turns out that to check it is necessary not only to inspect the outer surfaces under the hood, but also to remove the air filter, throttle assembly, etc.
Why does oil leak through the breather?
If oil appears from the breather, there may be several reasons. Given the various features, before self-diagnosis, you need to pay attention to additional symptoms.
Drives oil through the breather: diesel and gasoline internal combustion engines
Engine diagnostics for oil leaks through the breather requires an integrated approach. There is no need to disassemble the power unit to check. It becomes clear that at the initial stage you should assess the condition of the breather, make sure it is working and clean the device if necessary. The oil level is also checked using the dipstick. If everything is fine with the level and there are no other additional signs of a problem, then it is optimal to replace the breather with a known good one.
After making sure that the breather is working properly and ventilation is at an acceptable level, you will need to make a series of measurements and assess the condition of the CPG. As already mentioned, the cause may be failed rings, that is, you will need to measure the compression in the engine.
We also recommend reading the article on how to correctly measure compression in cylinders. From this article you will learn about why, how and with what tools this procedure is carried out to obtain accurate data.
Also, the color of the exhaust gases can additionally indicate the need to measure compression. To check, just start the engine and then evaluate the exhaust. If the engine smokes blue or gray smoke, then this may be a sign of engine oil getting into the cylinders due to worn piston rings.
When checking compression, you need to take readings in each individual cylinder. In the normal state of the CPG, compression should be at 11 MPa and above (it is recommended to consult the technical literature in relation to a specific type of internal combustion engine).
If a run-up is detected according to the readings in the cylinders, the differences should not exceed 1 MPa.
Failure to reduce compression will indicate that further checks will be related to the ventilation system. The method for testing this system will be considered using the example of the domestic VAZ 2110 model. Other cars may have some individual features, but the general principle will be similar.
Let's sum it up
Taking into account the above, it becomes clear that an increase in crankcase gas pressure and oil leakage through the breather indicate a number of problems with the breather or internal combustion engine. Quick detection and elimination of faults will reduce the cost of repairing the power unit. This is true if the problem is eliminated at an early stage, that is, without the consequences that arise after a long period of ignoring the malfunction and further active operation of the engine.
We also add that cleaning the crankcase ventilation system is not a complicated procedure, so in some cases such an operation can be carried out in the garage with your own hands. Moreover, it is recommended to clean the ventilation system regularly during each scheduled maintenance in parallel with changing the engine oil.
Finally, we note that quite often heavy oil leaks through the breather do not appear immediately. In other words, the lubricant may leak slightly, which is sometimes unnoticeable. In other cases, about 0.5 or a liter of lubricant can escape through the breather from the lubrication system, taking into account a short mileage (on average, 1-3 thousand km). With such a significant leak, the operation of the internal combustion engine is stopped, diagnostics and repairs are carried out.
Source
SVKG device in Lada Priora
In all brands of cars, the SVKG is built on a similar principle. Only small details differ. On the upper side of the crankcase there is an oil separator, which looks like a hollow plug. An oil deflector is placed under the plug, which is designed to clean the gases from the crankcase as much as possible from oil particles. The oil separator has an outlet for the crankcase ventilation hose.
In order for the gases to return to the cylinder chamber, a ventilation valve is placed along their path. The valve has three modes, which allows you to maintain a certain level of gas rarefaction in the crankcase.
While the engine is idling, gases move through a small circuit hose through a special passage hole in the throttle assembly. At this time, a high vacuum is created in the intake hose, which allows crankcase gases to be effectively sucked out of the throttle block. The passage hole in the throttle regulates the amount of gases that are sucked out.
This allows you to stabilize the engine in idle mode. When the car begins to move, the throttle valve opens, causing gases from the crankcase to enter the cylinder through a large circuit hose for combustion.
Why do you need to clean the crankcase ventilation on classic engines?
Welcome! Cleaning the crankcase ventilation system - what is it and why is it needed? Sometimes this question is asked by many people who own a car. In fact, cleaning this system is mandatory and due to the severe contamination of this system, the engine begins to develop problems such as: Oil squeezing out from all sorts of cracks in the engine (Mainly through seals), and oil consumption increases accordingly.
Why do you need to clean the crankcase ventilation system?
It is produced because over time, the crankcase ventilation in the car becomes clogged and, therefore, it becomes increasingly difficult for crankcase gases to pass through the clogged hoses of the system, and therefore contamination of this system usually leads to an increase in gas pressure in the engine and to a reduction in the service life of the engine parts itself.
Note! By reducing the life of engine parts we mean such parts as: Various types of oil seals, seals, etc. Because as a rule, when squeezing out oil (as discussed above), they are the first to suffer. And if the ventilation system is very dirty, then most of the engine parts suffer, mainly the cylinder walls!
On what principle does the crankcase ventilation system work?
In fact, everything is very simple, you probably already have an idea of how a car engine works, that is, when the engine is running, air together with gasoline is compressed and then explodes in the cylinder. But you still need to take into account the fact that the cylinder cannot be sealed “100%” and therefore some of the exploded gases break into the engine crankcase where these gases, as a rule, should not be located. And so that they do not remain in the crankcase for a long time, the gases come out very quickly through the oil separator and breather and then enter the car engine through a hose.
Why do gases get back into the engine and is it harmful?
Remember? Almost at the beginning of the article it was stated that due to crankcase gases, the cylinder walls can be damaged. And all this is connected with the fact that the hose coming from the breather is connected directly to the air filter housing and also in the place where there is no air filter, since it is located a little higher. And as a result, through a contaminated hose, dirt enters the engine and after the next compression stroke, this dirt can damage the mirror part of the cylinder wall and reduce the life of your engine.
And the fact that the gases return to the engine is very good because the environment is not polluted, i.e. our ecology. But this is harmful to the car engine, because as a rule, crankcase gases constantly circulate and if the crankcase system is heavily contaminated, as mentioned above, this will have a very bad effect on the life of your engine.
Note! At the end of the article there is an interesting video clip that shows how you can make sure that crankcase gases do not get back into the car engine, but always only go out into the atmosphere without polluting it!
How to clean the crankcase ventilation system?
- How to clean the system - on the classics?
Additional video clip: In this video clip, the well-known carburetor specialist “Nail” demonstrates an interesting idea, thanks to which the engine of your car will last a longer life, and besides, it will not pollute the environment very much.
Article: 2112-1014056, additional articles: 2112-1014056Р
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Today, in the next article in the series “Crystal VAZs or typical breakdowns of domestic cars,” we will talk about the latest developments of the Volzhsky Automobile Plant: Lada Grante and Lada Largus. Let's talk about the history of the creation of these models, as well as their characteristic malfunctions.
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One of the reasons why the cooling system on Kalina may become airy is because the stove will be damaged.
ENGINES VAZ 21124 and VAZ 2112 16 VALVE MAIN DIFFERENCES
VAZ 2112 and VAZ 21124 What are the main differences between 16 valve engines. What are the differences between VAZ 2112 or 21124 16v engines. Diff.
Replacing the generator bearing
Replacing the front generator bearing on a Chery Tiggo with a Mitsubishi 4G64 2.4 and 4G63 2.0 engine. Bearing number – 6303.
Replacing the thermostat on a VAZ 2114.
In this video I will tell you how to change the thermostat on a VAZ 2114 with your own hands. Similar to Priors, Kalinas, and Grants.
How to remove the crankshaft pulley (using the example of a VAZ car)
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Damage to power plant mechanisms
Damage to the power plant mechanisms responsible for proper mixture formation and oil separation in the combustion chamber (piston scuffing, oil scraper rings, burnout of valves, disappearance of honing, etc.) In this case, the oil enters the combustion chamber of the car, where it mixes with fuel and air vapors, burns out completely. Oil consumption with such a malfunction can be enormous, more than 1 liter per 1 km. Black smoke begins to pour out of the exhaust pipe. This malfunction is caused by driving on a “cold” engine. After 50-60 cold starts, honing sets the oil scraper rings in one direction, the seal is broken and oil consumption increases. The skirt comes off the pistons, the valves burn out, the oil seals become hard. There is only one treatment - engine overhaul.
Product delivery options
Note! Below are the shipping methods available specifically for this product. Payment options may vary depending on the shipping method. Detailed information can be found on the “Delivery and Payment” page.
Parcel by Russian Post
Available payment methods:
- Cash on delivery (payment upon receipt)
- Using cards Sberbank, VTB, Post Bank, Tinkoff
- Yandex money
- QIWI
- ROBOKASSA
Shipping throughout Russia. Delivery time is from 5 to 12 days.
Parcel by Russian Post 1st class
Available payment methods:
- Cash on delivery (payment upon receipt)
- Using cards Sberbank, VTB, Post Bank, Tinkoff
- Yandex money
- QIWI
- ROBOKASSA
Shipping throughout Russia. Delivery time is from 2 to 5 days. More expensive than regular delivery by Russian Post, approximately 50%. Parcel weight up to 2.5 kg
Express Parcel EMS
Available payment methods:
- Cash on delivery (payment upon receipt)
- Using cards Sberbank, VTB, Post Bank, Tinkoff
- Yandex money
- QIWI
- ROBOKASSA
Shipping throughout Russia. Delivery time is from 3 to 7 days. More expensive than regular delivery by Russian Post, approximately 100%.
Transport companies
Available payment methods:
- Using cards Sberbank, VTB, Post Bank, Tinkoff
- Yandex money
- QIWI
- ROBOKASSA
Delivery is possible to any locality where there is a representative office of the transport company. Delivery time is from 2 to 10 days. Sending large parcels is approximately 50% more profitable than by Russian Post.
Courier delivery in Togliatti
Available payment methods:
- Cash upon receipt
- Using cards Sberbank, VTB, Post Bank, Tinkoff
- Yandex money
- QIWI
- ROBOKASSA
Delivery time from 1 to 12 hours.
