Black smoke from exhaust pipe, increased fuel consumption, tripling - all these are symptoms of carbon deposits on the surface of the pistons or, in other words, engine coking. Do-it-yourself engine decarbonization implies a series of actions aimed at cleaning the cylinder from carbon deposits. piston group, compression and oil scraper rings.

Causes of soot formation

Solid coke deposits appear not only due to improper operation, but also due to the specifics of the engine.

The main factors of engine coking:

• Penetration lubricants into the combustion chamber;
• Incomplete burnout fuel mixture.

Also, the causes of soot in the engine can be:

• Usage engine oil not provided by the vehicle manufacturer;
• Operation of the machine only in urban mode;
• Frequent engine idling;
• Frequent overheating of the engine;
• Incorrect commissioning after a long period of vehicle inactivity.

Poor-quality fuel or failure of the valve stem seals will accelerate the appearance of deposits. Oil enters the combustion chamber through slots in the oil scraper rings and cokes under the influence of high temperature, which leads to decompression manifestations.

Soot formation zones

Coke deposits accumulate in the grooves located under the compression and oil scraper rings. This leads to an insufficiently tight fit of the rings to the cylinder walls and poor-quality oil removal. Further operation of oil scraper rings without repair leads to friction, overheating of parts and burnouts in the piston.

Signs of worn rings:

• Oil on the exhaust pipe;
• A sharp increase in oil consumption;
• Blue smoke from the chimney at the beginning of the movement;
• Dirty spark plugs.

Analyze whether your car has one or more signs and, having given a positive answer, check the performance of the oil scraper rings.

Why do you need engine decoking?

Many car owners believe that buying modern machine relieve them of the need to get rid of carbon deposits in the engine. But is it really so? Even high-tech piston systems may need decarbonization for an engine.

Ignoring the symptoms of ring coking can cause irreparable harm to the entire piston complex. The appearance of soot leads to the following consequences:

• An increase in the thickness of the walls of the cylinders and a deterioration in heat dissipation;
• Weak fit of the valve and the possibility of burning it;
• Reducing the gap between the piston rings and the valve walls, which in turn leads to a decrease in compression and the occurrence of rings;
• Increased oil consumption due to impaired mobility piston rings.

Carrying out decarbonization with your own hands will help either solve problems with the engine, or establish that it is necessary to contact the service and overhaul.

What gives decoking:

• Restoration of engine performance;
• Economical consumption of oil and fuel;
• Increased engine dynamics;
• Reducing the amount of harmful impurities in exhaust gases.

The decoking procedure can eliminate the effects of decompression and power loss. There are several methods for decoking an engine. Each of them is based on the pouring of special chemicals, only the methods of carrying out the procedure and the chemicals used differ.

Please note that the engines of vehicles with high mileage and a significant degree of wear may deteriorate their performance after decoking. Due to severe wear of parts, coke deposits act as a sealant, and their destruction leads to a decrease in compression.

Decarbonizing with chemicals

Currently, there are many means for decoking, each of which has features in terms of chemical composition and method of use:

• LAVR ML-202 from domestic manufacturer. It is popular due to its relatively cheap cost and good performance. May be used for preventive purposes;
• SURM is another domestic product. When using it, there is no need to change the oil after the procedure;
• Edial is an easy-to-use product that is poured into fuel tank before refueling;
• Xado Anticoke complete with Atomic Conditioner shows excellent result but is quite expensive.

But no matter how much chemicals cost, an engine overhaul in a car service will still cost more.

There are two ways to fill chemicals: with hard decarbonization, the filling is done in the engine cylinder, with soft decarbonization - in fuel or oil.

Rigid decarbonization

To carry out hard decarbonization, the car must be level. Before carrying out the procedure, it is advisable to find out what the engine compression is at the moment for comparison with the indicators after cleaning.

Step-by-step instruction:

1. Warm up the engine to operating temperature;
2. Unscrew the spark plugs or injectors on the diesel engine;
3. Raise the drive wheels with a jack;
4. Set the pistons to the middle position by turning slowly crankshaft in high gear;
5. Pour the selected chemical into the cylinders with a syringe through the spark plug opening. The quantity depends on the volume of the cylinder;
6. Put the candles back and leave the chemical agent in the cylinders for the time specified by the manufacturer;
7. Rotate the crankshaft for optimal distribution of the drug every 5 minutes during the first 30 minutes;
8. Unscrew the candles and remove the liquid with a syringe;
9. Reset the negative terminal of the battery;
10. Crank the starter in neutral for 10 seconds to avoid water hammer;
11. Reinstall the candles;
12. Plug in the power;
13. Start the engine;
14. Let the engine idle for about half an hour.

Depending on the chemical used, the oil and oil filter may need to be changed.

In case of strong coking of the rings, it is better to pour the chemical through the hole of the nozzles, having previously unscrewed them. The time for exposure to chemicals is different, depends on the chemical composition, and in some cases can range from several days to a week. The stronger the coking, the longer it takes time.

Immediately after the decoking of the engine, the car may start with difficulty. As a rule, the first start-up will also be accompanied by a pungent smell of exhaust gases.

Attention! Rigid cleaning uses highly toxic substances. The procedure for removing coke deposits should be carried out in a room with good ventilation.

Decarbonizing with a mixture of acetone and kerosene

Proportions for decoking: three parts of acetone to one part of kerosene. The total amount is calculated based on the engine size - 300 grams per four-cylinder engine.

Step-by-step instruction:

1. Prepare a mixture of the desired proportions and volume;
2. Unscrew the candles on a slightly warm engine;
3. Pour mixture into cylinders;
4. Put the candles back;
5. Leave the product to influence the soot for a period of 9 to 12 hours;
6. Unscrew the candles;
7. Turn off the power;
8. By rotating the starter, remove excess fluid;
9. Start the engine.

If necessary, to increase the effect, repeat the procedure. Change oil and oil filter. Please note that after cleaning, oil is washed out, which can lead to wear of the piston rings.

High engine temperatures can cause the mixture to boil.

Soft decarbonization

A good way to do the decarbonization of the engine with your own hands, without having specific skills and experience.

• Pouring into oil

If the time to change the oil coincided with the desire to clean the rings, then add a special chemical to it. After adding a chemical agent in oil, you can drive 100-200 km, and then change it. It is impossible to do a complete cleaning in this way, but it is quite possible to remove deposits from oil scraper rings. Due to the thinner consistency of the oil, avoid driving at high speeds.

• Filling in fuel

Pour a suitable decarbonizer such as Edial into the fuel tank. Getting into the combustion chamber, it destroys the structure of the soot, and the particles, burning, go out together with the exhaust gases.

Prevention of the appearance of soot

In order to avoid engine coking problems, follow these guidelines:

• Do not let the car stand idle for a long time;
• Try not to let the car run at low speed for a long time;
• Warm up the engine for winter period;
• Change the oil in a timely manner;
• Use additives for decarbonization.

By properly operating your car and periodically carrying out a soft decarbonization, you can protect the car engine from breakdown.

What causes compression to drop and why does it happen unevenly?

If we do not consider cases associated with valve leaks, then the main cause of a drop in compression is a malfunction of the piston kit due to coking or wear of parts.

Wear and coking of the piston rings, piston and the entire engine occurs unevenly both in different cylinders and in the height of each of them. Therefore, measurements often show that the performance of one or more cylinders differs from the norm, failing in compression.

The speed and intensity of these processes are affected by various temperature regime, different lubrication and combustion conditions, as well as specific factors - for example, where blow-by gases are supplied. Naturally, the quality of fuel and oil is of great importance. The worse it is, the faster cokes and deposits form in the cylinders.

Our grandfathers used kerosene, water, or solvents to clean pistons and cylinders. What is the best liquid for decoking the LAVR ML-202 engine?

Most household solvents don't fix the problem at all and can even be dangerous. Water even more so. Engine decoking agent LAVR ML-202 is a special tool that has several important properties. It is able to dissolve persistent carbon deposits, easily penetrates through small gaps, forms an active "steam bath", due to which the liquid actively impregnates deposits.

Also, the drug contains surface-active components, one of the functions of which is to protect cylinders from wear during decoking and engine start after it.

Is LAVR ML-202 safe for parts?

Decarbonizing fluid only affects coke deposits and soot, so it is safe for any car structural materials, including aluminum.

Will the problem with increased oil consumption after engine decoking be solved?

Oil consumption in the engine can increase for many reasons: due to wear of parts of the cylinder-piston group, coking of piston rings, oil entering the cylinder through crankcase ventilation, oil seepage through valve guides, wrong selection oils, etc. If the problem arose precisely because of the coking of the rings, then the coking will help. If oil consumption has increased for other reasons, then decarbonization will be a kind of engine diagnostics.

Will your liquid help if the car service recommended a major overhaul?

In case of malfunctions in the operation of the car, services often “prescribe” engine overhaul, since it is more profitable and makes it possible to carry out fault detection (actual assessment of the state of parts). In many cases, decoking the engine with LAVR ML-202 really makes it possible to increase compression and avoid major repairs. If the cylinder-piston kit is badly worn out or the reason for the drop in compression lies in something else (for example, in leaky valves), then the motor will have to be repaired. In any case, we advise you not to neglect decoking. Even in car services, the drug is used to more accurately diagnose engine problems.

How to decoke a V-shaped or boxer engine?

Non-standard engines are more difficult to decoke than conventional in-line ones. but general principle the same.

• you will need more fluid than to decoke a standard inline four-cylinder engine
• for best effect, the liquid should cover the piston completely or at least three-quarters. In this case, the engine decoking agent will seep well into the piston grooves and soak the carbon deposits on the rings.
• you can decoke the cylinders one by one. Partially use the liquid that remains after decarbonizing the previous cylinder. In this case, you may not need a large amount of LAVR ML202
• to reduce the consumption of the drug, you can manually "compress" the filled liquid on the compression stroke by rotating the crankshaft. Then the liquid for decoking will completely fill the volume of the combustion chamber. This is how a boxer engine is usually decoked.

Is it possible to decoke the engine of a snowmobile, motorcycle or moped?

Engine decoking agent LAVR ML-202 is suitable for processing any piston engines internal combustion.

My car is very high mileage. Decoking has never been done. Will it damage my car?

We recommend caution when decoking the engine on older vehicles with high mileage. The fact is that with significant wear of the piston and rings, deposits act as sealing structural elements, due to which the required level of compression is maintained in the cylinders.

If deposits are removed, the clearance between the piston and cylinder will increase and compression may drop. Modern engines are less susceptible to this effect, since their parts are initially better fitted to each other.

After a long downtime of the car in the garage, the compression dropped. Will decoking help restore it?

Decoking can be done. But we note that an idle engine could not coke. However, in many cases, our product has restored compression after a long period of inactivity.

Will there be an effect if decoking is carried out in cold weather or not on a warm engine?

It is possible to carry out decarbonization in cold weather, and also not on a warm engine. But the effectiveness of the procedure will be somewhat less, since there will be no “steam bath” in the cylinders, due to which the vapors of the liquid will qualitatively impregnate the deposits and cokes of the combustion chambers. We advise you to leave the engine with liquid poured into it for decoking for 12 hours or a day.

Is it important to set the pistons to the middle position before introducing the decarbonizer into the cylinders? How to do it?

We recommend setting the pistons to the middle position in order to create approximately the same conditions for decoking different cylinders. Cylinder wear is uneven in height, and this affects how fluid will seep into the bottom of the piston.

In addition, the maximum raised piston will simply prevent the required amount of the drug from being poured. However, not every engine allows you to comply with this rule. Therefore, we advise you to treat this as an important clarification, and not a prerequisite.

For more information on how to set the pistons to the middle position, read here.

Why is it necessary to move the pistons during decarbonization?

It is not necessary to move the pistons during decarbonization of the engine, but it is desirable if possible. This is especially useful if you carry out express decoking in 1 hour. Due to this, the liquid will better seep into the lower part of the piston, soaking and softening deposits in the piston grooves and on the rings.

Is it possible to increase the exposure time of LAVR ML-202? Will it damage the engine?

Of course you can! The instructions for the preparation indicate that the exposure time can be from 1 hour (express decoking) to a day, if convenient. If necessary, you can leave the drug filled for 3-5 days.

It happens that the drug is left in the cylinders for several weeks due to various circumstances. No adverse effects on engine parts have been identified.

Is the oil film washed off the parts during decoking? Could this cause scoring on the piston and cylinder when the engine is cranked?

Engine decoking agent LAVR ML-202 is a special cleaner. Unlike conventional solvents, it contains surfactants. These components cover the parts with a film that protects them when the crankshaft is turned for the first time. Therefore, the formation of scoring on the piston is excluded.

Why does some of the decoking fluid remain in the cylinder after decoking?

There may be several reasons for this:

Part of the liquid has remained in the recesses of the piston crown and therefore cannot seep into the crankcase.

The pistons are at different levels. The lower piston in the cylinder is better sealed because the cylinder is less worn at its bottom. This prevents liquid from seeping out.

The deposits impregnated with the agent swelled and formed a mixed gel, which prevented the infiltration of the liquid.

What should I do if the engine does not start the first time after decoking?

Check if you have correctly assembled the parts after decoking. This is the most common reason that the engine does not start after decoking. If everything is assembled correctly, but the problem remains, dry the candles and cylinders by blowing them with compressed air.

After decoking, when starting the engine, the car began to smoke heavily. Is it normal?

The fact that after decoking from the exhaust pipe goes White smoke, there is nothing to worry about - it burns out the remnants of deposits and the liquid that has entered the exhaust system.

Does the preparation damage catalysts and candles?

Our preparation is absolutely safe for catalysts, candles, rubber parts and other parts, if you do everything according to the instructions.

Is it necessary to flush the oil system after decoking and before changing the oil?

It is not necessary to flush the lubrication system with specialized preparations. But we recommend to carry out such cleaning, as this contributes to a more complete removal of softened contaminants after decoking. Our oil system flushes or the engine decoking kit are ideal for this purpose.

Is it possible not to change the oil after decoking?

An oil change after decarbonization must be carried out without fail! The instructions clearly state that you need to change the oil immediately, and we cannot recommend otherwise. However, sometimes we allow ourselves to carefully drive to the oil change point. In doing so, we:

We are sure that the oil level in the crankcase is not too low, and the decoking fluid has not diluted it to the limit.

We are reasonable about distances: 3-5 kilometers in a gentle mode is not a problem for the engine.

We are more than sober about the load on the engine when driving: we do not overestimate the speed, we do not overload the passenger compartment with a crowd of people, and the trunk with sacks of potatoes and the like.

After decoking, the compression was not restored. What does this mean?

There can be several reasons: the actual wear of rubbing parts, air leakage through leaky valves, breakage of piston parts - for example, due to detonation.

Is it possible to combine flushing the injector and decoking the engine? What's better?

You can combine. But if there are no particular problems with the engine, it is enough to flush the injection system in a car service with preparations for flushing injection or diesel systems (LAVR ML-101 and LAVR ML-102). Both flushes have a decoking effect, which will be sufficient for prevention coking of piston rings.

If engine coking is suspected, use LAVR ML-202.

Can LAVR ML-202 engine decoking agent be used to flush the injection system?

Engine cylinders are parts in which there is a constant combustion of the fuel mixture that forms soot. Its removal is called decarbonization. Oil supply is carried out in two ways - using oil seals or piston rings. In the first case, you need to replace the node, in the second it is possible do-it-yourself piston ring decoking.

In a car service they will incline to overhaul motor, but you can get by with preventive methods. Having completed simple tasks to remove carbon deposits on your own, increase the car's mileage by 30-40 thousand km and do not lose money on replacement parts.

Causes of soot

The following reasons can be distinguished:

• Short trips in the off-season and in winter.
• Violation of the terms of oil change.
• Overheated motor.
• Poor quality engine oil.
• Idle car in winter.
• Various additives.
• Increased thermal mode of the engine.

The presence of a strong soot may indicate increased consumption fuel, black vehicle emissions, loss of power and low compression. Do-it-yourself engine decarbonization carried out using special means - chemical compositions for engine cylinders ( e.g. piston ring decarbonizer). The most famous - special equipment XADO, Titan, LAVR, SURM etc.

To clean the engine from slag without dismantling, LAVR for decarbonization of piston rings poured in doses - 45 ml into the technological connectors of the cylinders.

Before performing work, we put the car on a clean horizontal surface. So the cylinders will take a vertical position ( can be corrected manually if there is access). We warm up the engine to the desired temperature, turn off, remove the nozzles, glow plugs and ignition.

The technology is applicable only for in-line engines ( not opposed). To avoid ignition of the anti-coke drug. After all the manipulations, we leave the engine for a couple of hours, free the cylinder holes, scroll the starter with the gas squeezed out - this will remove excess chemicals in the cylinders. Next, we mount the removed parts and let the engine run idle, but with regassing, change the used oil.

The resulting soot must be loosened before removal. Otherwise, its residues will interfere with the normal operation of the engine. Coke deposits accumulate in the chambers and in the grooves under the piston rings. The rings become poorly mobile, do not fit snugly against the walls of the cylinders, which provokes inefficient removal of oil from the walls. This provokes a subsequent layer of soot, and so on, in ascending order, until it stalls.

Do-it-yourself ring decarbonization with the use of "chemistry" will require the following materials:

• soot remover (anticoke);
• syringe with tube we will pump out the remnants of chemistry from the cylinders);
• compressor ;
• oil filter ;
• oil to be replaced after all work has been completed.

After such a procedure, the car may give a black, pungent exhaust odor. You should not be afraid, after such a procedure, the phenomenon is normal, it is leftovers.

Correct decarbonization of piston rings, video:

Removing carbon deposits with water

Some motorists have learned to use a milder procedure that has the same effect on removing carbon deposits as chemicals. Decarbonizing with water- the most common way that owners of domestic and imported cars decide.

For the procedure you will need:

• distilled water in a plastic bottle;
• dropper;
• hose ( for windshield washer);
• tee ( connect washer).

The scheme of work is as follows: water from a bottle is connected through a dropper to the engine suction. You can use non-distilled water - the filtration system in the dropper itself will cope with the cleaning. The water supply starts with the engine running - at about 2000 rpm.

2-3 drops per second is enough for idling warm motor. The effect will not be long in coming, soot is removed, and the car becomes dynamic and economical.

Decarbonizing with kerosene - instructions

The occurrence of piston rings due to soot can be “cured” with kerosene. The method is especially good if the deposits on the rings and in the channels have created an insurmountable layer of coke. It will take mixture of kerosene and acetone 50:50.

Step-by-step description of soot removal:

1. Remove all spark plugs.
2. Pour about 100 mg into each hole in the cylinders (for even distribution of the mixture, it is preferable to install them in one line).
3. Mount candles, leave the car for the night (at least 8 hours).
4. Unscrew the candles, put rags on the wells of the candles.
5. Start the starter so that the remaining solution exits through the wells.
6. Tighten the spark plugs, start the engine, 15 km of run is enough to eliminate residues (it is advisable to choose a non-busy road, cleaning will provoke a lot of smoke).
7. Change oil.

Decarbonization of piston rings with kerosene- a simple procedure performed alone. As a result, we get normal, without overspending, oil consumption, improved dynamics of the car, clean nozzles, no detonation due to accumulated coke.

Decarbonization of oil scraper rings with kerosene, video:

Cleaning carbon deposits without changing the oil

This method of removing carbonaceous products is considered to be gentler. Piston ring decarboniser without oil change is a special additive to gasoline or diesel fuel. Their action is based on the removal of combustion products with a special chemical composition.

The inner surface of the motor is constantly exposed to special composition, which eliminates the accumulation of coke.

Some advantages of this method:

• Simplicity and convenience - no need to remove candles and nozzles.
• Introduction in a minute.
• Changing the oil in the engine is carried out as standard, according to maintenance.
• The surface of the engine is protected by the formed film, which reduces the accumulation of soot.

But it is difficult to call such drugs a panacea. It is rather a product of local action, which will help in case of mild coking. If the amount of carbon deposits is critical, additives will not be able to remove it, since they do not have a softening effect. These are flushing compositions with cleaning components to remove light carbon deposits from piston rings.

On the other hand, the only option is if the engine knock and black exhaust caught you by surprise on a long journey. Norm of use for cars constitute 50 ml for 40-60 liters of gasoline (or DT), for freight transport – 100 ml per 200 liters of fuel.

Important! Diesel units are refueled with alcohol-based depressant additives that reduce the viscosity temperature of diesel fuel. In this case, the combustion chamber gets dirty faster, and it is not advisable to remove the candles in the cold. Mild cleaning compounds will prolong engine life by eliminating deposits.

Piston ring cleaner has active particles that provoke the breakdown of carbon deposits and combustion when the fuel mixture ignites. As the fuel tank empties, the combustion chamber is cleaned.

Since the days of the USSR, the quality of gasoline has improved, but the problem remains - any driver is faced with the removal of slag and coke on piston rings. Soviet oil is also far from modern, but not a single car owner will undertake to fully assert that it does not form carbon deposits. Persistent deposits that affect the stable operation of the cylinders will lead to a major overhaul.

Main misconceptions:

The first wrong conclusion is that modern motors do not need decoking. Any motor is operated in harsh conditions, including in winter. This is the first and main reason formation of carbon deposits. Modern piston systems have provided parts with smaller gaps and grooves, and this is an increase in vulnerability.

Decarbonization of XADO, LAVR and other similar anticokes cannot be called the only method of "treatment" of the engine. Periodic cleaning with an oil change will give a good result, but the products are only good for standard motors. Namely - with a volume of not more than 2 liters, a vertical arrangement of cylinders, a shallow recess in the piston bottom. Otherwise, it must be filled with the tool separately.

The high cost is a reckless statement of an inexperienced driver. Anticoke is much cheaper than a major bulkhead. For example, decarbonization of laurel, the instructions for use of which are simple and understandable, Russian production, which means the price is several times lower than imported analogues. According to the research results, it takes the second place in the Russian market, the holding time of wetted pistons is 8-10 hours.

Engine decarbonizing fluid works for all types of engine in the same way. There is no need to look for compositions separately for diesel and gasoline engines. Repair and preventive operation is performed in a standard way. Avoid working in winter, outdoors or in the rain.

For convenient introduction of the composition into the holes, some manufacturers add a special syringe to the kit.

Of the funds that do not require the removal of candles, the most popular decarbonization Edial. The advantages - work exclusively in the combustion chamber, activation at elevated temperatures, cleaning in the normal mode.

Mixing is simple - just pour the drug into the fuel tank at the gas station before refueling. Priorities - decarbonization diesel engine , including mineral residues ( ash), which are formed at a temperature of 850 degrees.

How to protect the car from soot?

If the problem already exists, the car consumes more oil and gasoline, smokes and smokes, learn how to decarbonize the engine yourself. And may your "iron horse" never fail!

Decarbonization of piston rings without disassembling the engine is a procedure that motorists often resort to in order to improve engine performance and extend its life before overhaul.

What is engine decarbonization and how is it done, why does it need to be carried out, what type of decarbonization should be preferred and how can it be done most competently - let's try to figure it out.

What is engine decoking

Before answering this question, it is necessary to understand what coking is, what are the main causes of its occurrence.

According to Wikipedia, petroleum coke (this is what is formed in the piston group, there are also other varieties - stone, peat, pitch, ...) is a solid residue of oil refining. Thus, since a car engine recycles petroleum products, coke formation is an inevitable product of the operation of an internal combustion engine.

In new engines in which it is refueled normal fuel and timely oil change and maintenance is carried out, coke is removed from the piston group using lubrication, through exhaust system. As the piston group wears out, as a result of untimely maintenance, refueling with low-quality fuel, combustion products and thermal conversion of oil into coke settle on the rings.

Appearance of coked rings:

The main reasons for accelerating the process of coking of piston rings are:

• long parking vehicle, as a result of which condensate accumulates in the area of ​​\u200b\u200bthe rings, corrosion processes occur that increase the accumulation of oil;
• incorrect temperature regime of the engine (overheating);
• the use of untested oil additives, as well as low-quality oils;
• poor fuel quality;
• incorrect setting of the ignition angle.

How to tell if piston rings are stuck

One hundred percent answer to this question is given only by the dismantling of the piston group.

Video - answers to FAQ for decarbonization of piston rings:

Indirect signs of coking of piston rings can be considered:

• reduction of compression in one or a pair of cylinders from the nominal value;
• the appearance of bluish or white smoke from the exhaust pipe;
• increase in oil consumption (more than 0.3 kg per 1,000 km);
• reduction in engine performance.

In any case, if there is a suspicion of the occurrence of piston rings, it is easier to try to decarbonize them than to immediately resort to more drastic measures.

Possible options

The most reliable option for decarbonizing is to dismantle the pistons, decarbonize the rings, and at the same time change them. Of course, such an operation is performed during the overhaul of the engine.

When solving such issues, every car owner wants to get by with less labor and cash costs.

There is the most a budget option, so-called "soft" decoking. This is when special additives are added to the fuel in the recommended proportions and then continue to operate the car until a complete “cure”.

Motorists categorically do not perceive the effectiveness of such measures. They say that this is similar to taking an aspirin at a temperature of 40 and going for a walk until you recover. Although in practice there are many cases of a positive effect, moreover, even in neglected situations.

More common is the so-called "hard" decoking. For it, it is necessary to remove the spark plugs or glow plugs, perform a certain sequence of simple work. The effectiveness of "hard" decarbonization is recognized even by master minders.

It does not help in all cases, but as a hope for extending the life of the car before a major overhaul, it is quite suitable. Especially if problems are supposedly present in only one or two cylinders.

How to decoke piston rings without disassembling the engine: sequence of actions

The procedure for decarbonizing piston rings has a standard algorithm of actions for all cars, with the exception of the means used and the amount of liquid:

1. Disconnect the ignition coil control connector(s), remove high voltage wires(for gasoline engines).
2. Dismantle the spark plugs (injectors) of the car.
3. Using the starter or by turning the crankshaft pulley, move the crankshaft so that the pistons are as far as possible in the middle position of the cylinder.
4. Drain the oil from the crankcase, then re-tighten the drain plug.
5. Pour the decarbonizing agent into all cylinders (at the rate of about 100 ml of liquid agent or a tube per cylinder) sequentially, immediately setting the candles (injectors) in their original place so that the agent does not evaporate. For V-shaped engines, the volume of the agent poured into the cylinder should be increased by 20%.
6. The optimal time for decoking is at least 12 hours.
7. Open candles.
8. Unscrew the crankcase plug to completely drain the agent that has entered the crankcase.
9. Check the balance in the cylinder.
10. Release the cylinders from the remnants of the agent in the cylinders by cranking the engine with the starter for 10 seconds (in no case before this, do not connect the connectors of the ignition coils). At the same time, engine parts should be covered with rags so that the remnants of the product do not fall on it.
11. Tighten the crankcase plug, Tighten the spark plugs, fill in the oil.
12. Connect the connectors of the ignition coils, connect the high voltage wires.
13. Check for correct assembly.
14. Make a test drive (not driving on public roads) for 15 to 20 minutes, periodically raising the speed to 4,000 rpm.

Video - how to decoke oil scraper rings without disassembling the engine using LAVR ML202 fluid:

A positive effect is considered achieved if:

• reduced fuel and oil consumption;
• the compression on the cylinders will be aligned;
• engine performance will increase.

This effect can be felt after 200 - 300 km of run.

Means for decoking the engine

Currently, there are many means for decoking.

To the number folk remedies Traditionally, a mixture of kerosene and acetone is referred to in a volume ratio of 1 to 2. The most famous, well-advertised and, despite this, the most effective and fairly inexpensive means of engine decoking is LAVR. The XADO tool is also well recommended.

As a means for a “soft” procedure, Edial engine decarbonizing fluid is often used, which is added to the fuel as an additive and does not require an oil change.

Pros and cons of this procedure

The main advantages of the procedure for decarbonizing piston rings without disassembling the engine:

• minimum labor costs;
• no special equipment and premises are required;
• the possibility of independent work.

The disadvantages of decoking should include:

• there is no guarantee of work efficiency;
• sometimes the decoking of the rings leads to the exact opposite result (the rings freed from coke begin to “walk” inside the piston grooves, further reducing compression);
• Residues of super-aggressive decoking agents in the crankcase can damage the gasket.

Read about that, and how to deal with it with simple means.

Decoking of the rings, that is, the removal of soot formed on the piston rings of the engine, is a preventive measure designed to support good condition motor for a long time. This procedure will not inspire new life into the “killed” engine, but will help bring its performance back to normal. By itself, this operation is quite simple, so literally every motorist is able to cope with the decarbonization of rings with their own hands.

Why is it necessary

One of the functions of piston rings, along with sealing the combustion chamber and preventing overheating of the piston, is to regulate the thickness of the engine oil film on the cylinder. The oil scraper rings included in the piston set are responsible for this. The compression rings located above, in turn, are responsible for the tightness of the fuel combustion chamber.

During operation, deposits form on the oil scraper rings as a result of friction, exposure to hot exhaust gases and products of combustion of fuel and oil. They are especially characteristic of diesel vehicles, the fuel for which contains a large percentage of sulfur.

With an increase in soot, the rings coke, that is, they lose their mobility and cease to fully fulfill their function of removing excess oil from the cylinder walls. As a result, excess oil remains on the cylinder walls and begins to burn, which leads to even more carbon formation.

Decarbonizing - cleaning of piston group parts from carbon deposits

In itself, coking is quite natural, since it is integral part engine wear process. Improper operation of the car can significantly accelerate the onset of this phenomenon. The following actions lead to coking of piston rings:

• violation of engine oil change periods;
• use of low quality oil;
• adding low quality additives;
• motor overheating;
• increased thermal mode of the engine due to problems with the cooling system;
• lack of operation of the car in the winter, or short trips at low temperatures;
• driving on an unheated engine in the winter season;
• long idle time of the car (several months).

Coking can also occur for natural reasons. Even the observance of all measures to avoid this phenomenon will not help if the car's mileage has exceeded 100 thousand km.

Most often, piston rings are made of cast iron or alloy steel.

Engine stalling is manifested by the following symptoms:

• low compression in the engine cylinders;
• the car noticeably loses power;
• oil consumption increases sharply;
• blue or black smoke coming out of the exhaust pipe.

When observing these signs, it is desirable to decoke the engine. If this is not done, then in the course of further operation, the wear of the parts of the cylinder-piston group will significantly accelerate. The formation of microcracks due to increased friction as a result of wear is a direct path to an expensive overhaul of the engine.

Piston ring decarbonizers

There are several ways to decoke, but there are even more means. However, they can also be divided into several groups. First, we will describe a few tools that you can make yourself.

1. The simplest method is to treat the rings with water, sometimes hydrogen peroxide (peroxide) is added as an active ingredient. For this method, it is necessary to arrange a “dropper” from a plastic bottle that supplies water to throttle valve. Getting into the combustion chamber of the fuel, the water evaporates, and the steam cleans the cylinder-piston group from carbon deposits. On some engines, this method shows quite effective results, but there is a danger of “catching” a water hammer, the consequences of which for the motor can be deplorable.
2. Another tool for cleaning piston rings from carbon deposits is kerosene mixed with acetone. In such an old-fashioned way, it was customary to clean the rings from soot in the days of the USSR on old VAZ cars. With a mixture of acetone and kerosene, it is necessary to clean the rings manually, that is, you will need to disassemble the engine. So, in addition to the chemical reaction necessary for purification, a rough mechanical effect is also used here. Despite the good cleaning results, this tool has its drawbacks. Kerosene and acetone are aggressive to oil, so after the procedure it will have to be changed, and candles can also be ruined after decoking.
3. Stove cleaners are yet another decarboniser unexpectedly discovered by resourceful car owners. They show good results, as they really effectively remove carbon deposits from the rings. But this method has several important nuances. First, you have to disassemble the engine and remove the rings. Secondly, it is necessary to wipe the parts from soot, and not soak. That is, there is no fundamental difference in cleaning the stove and piston rings in this case. Thirdly, only expensive imported products are suitable, as they show the most effective results. Most likely, there will be no sense from cheap cleaners from the nearest store. And fourthly, this liquid has a rather aggressive chemical composition. The sodium contained in it is harmful even to the human body, so the procedure must be carried out with gloves. The chemical agent will not damage piston rings made mostly of cast iron, but it is contraindicated for aluminum parts of the cylinder-piston group. So it can only be used when removing carbon deposits from the rings, but if cleaning of the pistons is also planned, then the liquid for stoves is not suitable.
4. The next tool used to clean carbon deposits is dimexide. This drug shows good results when decoking. But the disadvantages of its use are no less than the pros. It is effective only at temperatures above +10 °C, so it is only used on a hot engine. Also, for cleaning, you will have to remove the rings, since when dimexide is poured into oil as an additive, it does not mix with it and oil starvation begins. Well, an additional minus can be called the extreme aggressiveness of the drug - it can damage human skin, can corrode paint, etc. In general, this is a fairly cheap, but rather dangerous way of decoking.

The next group includes professional chemicals designed to clean carbon deposits from rings. They are poured into the oil as additives and are able to effectively remove carbon deposits from oil scraper rings. The use of such additives is called the mild decarbonization method. After filling, you need to drive a couple of hundred kilometers, and then you should definitely change the oil.

Dimexide is one of the most common means for carrying out the decarbonization procedure, however, reviews about the drug are ambiguous

This is a good way to clean carbon deposits from rings, but it also has several drawbacks. Firstly, it will not be possible to clean other elements of the cylinder-piston group, since the oil with the additive does not get inside the cylinders. Secondly, the effectiveness of such additives is average - they will clean up light soot, but they may not be able to cope with serious complications. And thirdly, after use, it is necessary to change the oil and filter. These fluids include, for example, Kangaroo ICC300 or Gzox.

A variety of such funds are fuel additives. They are not added to the oil filler neck, but to the fuel tank. One bottle is enough for about 40-60 liters of fuel. After use, new spark plugs must be installed. Oil and filter changes are not required, which is a definite plus. Such cleaners are rather preventive: they will not get rid of serious soot, but they will prevent its occurrence. Such means include, for example, the Edial additive.

Another group of cleaners are professional products that are not added to the oil, but are injected into the cylinders. These include, for example, the beloved liquid Mitsubishi Shumma. According to many experts, this better remedy to remove carbon deposits from the elements of the entire piston group. The popular domestic cleaner LAVR belongs to the same series. Such funds are introduced into the cylinders through a tube, so that neither disassembling the motor nor pouring the cleaner into the oil filler neck is required. After holding for several hours, the liquid is drained along with the remnants of soot. The disadvantages include a rather high cost, and for some products - an aggressive chemical composition.

Decarbonization methods

All types of decarbonization can be divided into two large groups: in the first case, it is necessary to disassemble the engine and dismantle the piston rings, in the second, cleaning can be done without removing the motor.

When disassembling the engine, you can achieve the best results. This method is used for serious coking, when the piston rings practically do not cope with their functions. This is the most reliable way of decoking - all parts of the cylinder-piston group are disassembled and either soaked in a chemical agent, for example, a mixture of kerosene and acetone, or cleaned manually with brushes. In this way, all carbon deposits can be removed, which can be difficult to achieve using other methods. Carbon deposits in piston rings can accumulate for years, and if the additives do an excellent job of cleaning the compression rings, then it is difficult for chemicals to access the oil scrapers. Dismantling the engine and soaking the elements of the cylinder-piston group in a solvent can remove even the oldest carbon deposits.

Replacing oil scraper rings or cleaning them during disassembly is the most effective method of decoking

The disadvantage of this method of decoking is also understandable. It is available only to those who are well versed in the design of the motor and are able to disassemble and assemble it without unpleasant consequences. For beginners, in this case, it is better to contact a car service.

Without disassembly

The decarbonization of piston rings without disassembling the engine is carried out by chemical means and involves the use of soft or hard methods. The mild method uses professional additives added to the oil or fuel. When using the hard method, a special agent is injected into the engine cylinders.

The soft method implies that decarbonization occurs on the go while the car is moving. The sequence of actions of the method is as follows:

1. It is more expedient to use the additive before a scheduled oil change, since its use implies the further carrying out of this procedure. The agent is simply poured into the oil filler neck, no preliminary preparation is required.
2. Then the car is operated in soft modes, as harsh conditions can damage the engine.
3. After the mileage is 200 km, it is necessary to change the oil and oil filter.

It is most reasonable to carry out decarbonization with a soft method before a scheduled oil change.

Fuel additives are even easier to use:

1. The product is poured into the fuel tank, one bottle is enough for about 40-60 liters of fuel. It is best to pour the agent, then fill full tank at a gas station.
2. The effect of the use of additives occurs at vehicle speeds over 60 km / h. So it will not be superfluous to make a country trip.
3. After the needle of the fuel gauge approaches zero, the spark plugs should be replaced.

The scheme for applying the hard decarbonization method looks completely different. In this case, the cleaning agent is poured directly into the engine cylinders. Decarbonization occurs not during movement, but by soaking the parts with a chemical agent, but without disassembling the engine. The hard method can be called combined, since it combines elements of the soft method and the method with engine analysis.

Rigid decarbonization requires vehicle preparation and strict adherence to cleaning rules. The sequence of actions when using LAVR or a similar chemical cleaner is as follows:

1. The machine must first be installed in a horizontal plane. It is desirable to warm up the engine to operating temperatures - this mode creates the effect of a steam bath, which will soften the carbon deposits.
2. After that, you need to disconnect the high-voltage wires, unscrew the spark plugs (on petrol car) or injectors (for diesel engines).
3. The pistons should be set to the middle position (you can check with a long screwdriver).
4. Next, you need to pour the decarbonizing agent into the cylinders through the tube. For filling, use the tube included in the cleaner kit.
5. Then you need to screw the candles (nozzles) back so that the liquid does not evaporate. It is better to do this not to the end, so as not to create excess pressure in the cylinders.
6. The product should be drained after the period specified in the user manual. For better cleaning of rings from soot, it is advisable to fill in for the maximum possible period (up to 12 hours).
7. After the expiration of the specified period, the candles must be unscrewed again. To prevent the cleaner from splashing out of the wells and damaging the rubber elements in engine compartment, this must be done with some caution.
8. Then you need to remove the remaining liquid from the cylinders. To do this, turn the starter several times, after closing the candle wells with rags. The remaining liquid should “fly out” of the candle wells onto the rags.
9. Next, you need to screw in the candles, start the engine and warm it up to operating temperatures at idle.
10. After the above steps, you can make a short trip without raising the engine speed above 4 thousand rpm. During the trip, white smoke may come out of the exhaust pipe, which is a normal effect after the operation.

It is most convenient to pour the decarbonizing agent into the cylinders using a syringe and tube

The harsh cleaning method calls for an oil and filter change, so after a test drive, you should do this immediately. To consolidate the result after a hundred kilometers, it is desirable to re-decoke. In this case, the entire sequence of actions, including changing the oil and filter, must be repeated.

As you can see, decoking piston rings is not the most difficult task. However, this statement is true only for cases of cleaning the rings without disassembling the engine. Decarbonizing with parsing should be carried out only by those drivers who have rich experience in repairing their "iron horse". For novice car owners, it is better to entrust the analysis of the engine to car service employees.

The result of any of the decarbonization methods should be an increase in engine power and a decrease in oil consumption. Best Results gives mechanical removal of carbon deposits with engine disassembly and a tough decarbonization method. A mild cleaning method using additives is more prophylactic in nature - old carbon deposits cannot be removed in this way.