Cleaning of engine combustion chamber from carbon monoxide without disassembly

The operation of a modern car inevitably leads to education. smog This process is a natural consequence of combustion, especially if you're often in the city in a stop-start mode, and over time, solid deposits start to accumulate on the pistons, valves and cylinder walls, which negatively affects dynamics and fuel consumption.

Many car owners at the first sign of power loss immediately plan a major overhaul, but in most cases helps to improve the quality of the car. scoopingThis is a procedure that allows you to clean the internal parts of the engine from carbon deposits without removing the cylinder head, properly cleaned can extend the life of the engine and restore its factory performance.

In this article, we will discuss in detail the chemical and mechanical methods of pollution control, as well as the effectiveness of various additives. diesel And gasoline engines require different approaches, and what mistakes are absolutely not allowed in the maintenance, and proper care of the combustion chamber is the key to the long life of your car.

Causes of education and consequences of garnet

The main source of particulate matter in the engine is incomplete combustion of fuel. When the mixture is too rich or the temperature in the cylinder is insufficient, the hydrocarbons do not have time to fully oxidize and settle on hot surfaces in the form of a lacquer film. Over time, this film hardens, turning into a dense layer. cokewhich is difficult to remove by conventional methods.

The situation is aggravated by using low-quality fuels or motor oils with a large number of additives. Synthetic The foundations often burn cleaner than the mineral ones, but when they are exceeded by replacement intervals, they can also produce abundant precipitation, and the condition of the piston rings, which lose mobility when coking, becomes a critical factor.

Ignoring the problem causes serious mechanical damage, so the solids of the coke act as an abrasive, accelerating the wear of cylinders and compression rings, and the deposits can also be a source of damage. potassium-ignitionWhen the mixture is ignited not from a spark, but from hot carbon particles.

⚠️ Warning: A sharp increase in oil consumption and the appearance of blue smoke from the exhaust pipe often indicates that the oil removable rings are already lying down and require urgent decoking until there is a risk of cylinder bullying.

The most susceptible to the formation of deposits are engines with direct fuel injection, such as: GDI or FSIIn these engines, gasoline does not wash the intake valves, which leads to rapid fouling of their working surface, which reduces the efficiency of filling the cylinders and disrupts the mixture.

Symptoms of combustion chamber pollution

You can tell that the engine needs cleaning by a number of indirect signs that you see in the operation, the first bell is usually loss of traction at low speeds and difficulty starting in the cold season, and the engine starts to work less stable, especially when idling.

The driver may notice increased fuel consumption, which is not due to changing driving style or seasonal factors, because the layer of coar reduces the volume of the combustion chamber, increasing the degree of compression, and disrupts the heat transfer from the parts of the cylinder-piston group.

• 📉 A noticeable decrease in the dynamic specifications of acceleration and deterioration of the responsiveness of the gas pedal.
• 🌫️ The appearance of black or gray smoke from the exhaust pipe with a sharp press on the accelerator.
• 🔊 The occurrence of detonation (sound knocking) under load, especially when using fuel with a low octane number.
• 🌡️ Local overheating of the engine due to deterioration of thermal conductivity of the walls of the cylinders covered with an insulating layer of coar.

The compression measurement also helps to diagnose the problem, and if one or more cylinders are significantly lower than normal, this may indicate rings, but before you draw conclusions about mechanical failure, you should try a cleaning procedure.

Chemical methods of engine cleaning

The most popular way to control sediments is to use special autochemistry, and the market offers a wide range of drugs, from mild additives to fuels to aggressive solvents, poured directly into cylinders, depending on the degree of contamination and the design of the motor.

Soft cleaners are added to a gas tank or an engine crankcase and work gradually, dissolving deposits during operation, they are effective in preventing and removing fresh sodium, but they may be powerless against old, sintered formations. hard-cooking.

The hard method involves pouring concentrated composition into cylinders through candle holes. Aggressive chemistry dissolves solid coke, turning it into slurry, which then burns out or is removed through the exhaust system. It is important to strictly follow the manufacturer's instructions so that the rubber seals do not damage.

Among the popular brands, Solvent and Glycol-based products are highly penetrating and effective in softening even hard deposits, but after their use, it is imperative to replace the engine oil and filters, as some of the chemistry inevitably enters the crankcase.

Mechanical cleaning and water vapor

In addition to chemistry, there are physical cleaning techniques that are often used in specialized services, and one of the most effective ways is to inject hydrogen-oxygen mixtures or water vapor into the intake manifold of a running engine. decarbonization.

When you feed steam into the combustion chamber, you have a dramatic change in temperature and chemical reaction, which causes the soda to burn out and fly out through the exhaust pipe, and the good thing about this is that it not only cleans the cylinder, but also the valves and the turbine, if there is one, but it does require special equipment.

Ultrasonic mechanical cleaning or sandblasting is only used when the engine is completely disassembled, so in the context of "no disassembly" methods, they are not considered. However, some masters practice washing the engine with kerosene or a mixture of acetone and oil, leaving the mixture in the cylinders for a long time.

Hydrogen purification efficiency

Many people are skeptical about steam cleaning, considering it marketing, but the physics of the process confirms the effectiveness: the combustion temperature of hydrogen is higher than that of gasoline, which helps burn sediments, the main thing is to control the temperature of the engine so that the GBC does not overheat.

It's important to understand that mechanically removing large pieces of sodium without disassembling is not possible. If the sediments have acquired the structure of the stone, the chemistry can only soften the top layer, and in such cases, it sometimes requires a repetition of the procedure or the use of more powerful solvents.

Step-by-step instructions for coking

If you're going to clean the engine yourself, you're going to need a toolkit: a candle wrench, a syringe with a tube, a decoying tool, and a new engine oil. Before you start, you're going to have to warm the engine to operating temperature to make the chemical reaction more efficient.

Then the spark plugs (or nozzles, depending on the design) are twisted and the pistons are placed in the middle position, so that the liquid washes the maximum area of the side surface of the cylinder and the bottom of the piston, and each cylinder is filled through a tube with a calculated amount of drug.

After filling, the holes are closed with candles (without puffing) or special plugs, and the engine is left for the time specified in the instructions (usually from 1 to 12 hours). Periodically, the crankshaft is recommended to be turned manually so that the mixture penetrates deeper under the rings. After the time, the candles are twisted out, and the engine is scrolled by the starter to remove the remaining fluid.

The final step is assembly, engine start and idling until the residues of the drug burn out from the exhaust system, at which point there may be abundant white smoke and unpleasant odor, after cooling, the oil and filter must be replaced.

Type of engine	Expenditure	Exposition time	Frequency of procedure
Gasoline, volume up to 2.0 l	30-40 ml per cylinder	1-3 hours	Every 60,000 km
Diesel, turbocharged	40-50 ml per cylinder	3-6 hours	Every 40,000 km
Direct injection engine	50-60 ml per cylinder	4-8 hours	Every 30,000 km
Rotary engine (Wankel)	Special Composition through the inlet	In the process of moving	Every 10,000 km

Cleaning errors and precautions

A flawed decoking procedure can do more harm than good to the engine, and the most common mistake is to inject a lot of aggressive chemicals into the crankcase, which leads to oil liquefaction, loss of lubricating properties, and risk of turning the liners on the first start.

Another danger is education. hydraulicIf you put too much liquid in the cylinder and try to turn the crankshaft, an incompressible substance can bend the rod or break the piston, so you need to scroll the engine with the starter twisted candles and be careful.

⚠️ Warning: It is strictly forbidden to leave a car with chemical stuffed in cylinders unattended in the open air or in a poorly ventilated garage. solvent vapors are toxic and flammable.

Also worth mentioning is the risk of damage to the catalytic converter. When large amounts of carbon monoxide and residues of the decoker burn out, the flow of hot gas can crumble the ceramic cells of the catalyst, so after the procedure, it is recommended to carefully monitor the state of the exhaust system.

Prevention of sediment formation

To avoid the need for radical cleaning, you need to follow a culture of car operation. The engine does not like constant short trips and idling. It is periodically useful to give the engine a load by warming it up at high speeds, which contributes to the self-cleaning of the combustion chamber.

The quality of the materials used is critical: the use of certified low ash oils (Low SAPS) and good fuels significantly reduces the rate of sodium formation, and regular replacement of filters also helps to maintain cleanliness in the system.

• 🛢️ Use engine oils with tolerances recommended by your car manufacturer.
• ⛽ Refuel only at proven gas stations, avoiding fuel with a questionable octane number.
• 🚗 At least once a week, make trips on the track at 3000-4000 revolutions per minute.
• 🔧 Follow the maintenance regulations and do not delay with the replacement of oil caps.

In today's turbocharged engines, it's especially important to use fuel-cleaning additives at every refueling station, which keep the injectors and valves clean, preventing the formation of the primary layer of sodium, which then turns into coke.

FAQ: Frequently asked questions

Can I do the decoding on a warmed-up engine?

Yes, this is a prerequisite for most chemical methods: warming to the operating temperature (90°C) is necessary to make the metal expand, the gaps increase, and the chemical reaction proceeds more efficiently.

Does the decoking eat the valves' ossels?

High-quality modern solvents are safe for rubber products, if not exceeding exposure time. However, old, sulphured oils after cleaning may begin to leak oil more actively, because the soda that "holds" them will be removed. It is not the fault of chemistry, but the wear of seals.

How often should the combustion chamber be cleaned?

Preventive cleaning with soft additives can be done every 5-10 thousand kilometers. Aggressive decoking with pouring into cylinders is recommended to be carried out no more than once in 40-60 thousand kilometers of run, or when there are obvious symptoms of rings.

Will the oil be used if there is already oil consumption?

If the oil consumption is caused by the oil rings being deposited due to coke, the procedure in most cases helps restore their mobility and reduce the amount of carbon dioxide. If the reason is the wear of the cylinders or the destruction of the valve ossels, the chemistry will be useless.