Cleaning the engine from soot without disassembly: technologies and risks

Operating a modern car in an urban environment inevitably leads to the formation of sediments in the combustion chamber. Short trips, frequent warming up and poor fuel quality create an ideal environment for the development of the car. smogThis solid carbon layer settles on the pistons, valves and spark plugs, disrupting the normal operation of the power unit.

Decreased compression, increased oil consumption, and a drop in traction are the first alarming symptoms, and drivers often face the dilemma of whether to open the engine for mechanical cleaning or try chemical methods. Decoxing without disassembly is becoming a popular solution that allows you to reanimate nodes without expensive intervention.

But blind trust in miracle remedies can be fatal: chemically aggressive compounds can not only dissolve sediments, but also destroy the osteoils or clog the oil channel. Understanding the physicochemical processes inside the cylinder will help make an informed decision about the feasibility of the procedure.

Causes of formation and the effect of sediments

The main source of pollution is not only fuel, but also motor oil. At high temperatures, heavy fractions of oil enter the combustion chamber through the combustion chamber. oil-ring Or the crankcase ventilation system, they burn out, the residues turn into solid particles of soot and coke, especially those that are affected by direct fuel injection and turbocharging.

The piston-based garment changes the geometry of the combustion chamber, effectively increasing the compression ratio, and it causes detonation, which is the explosive combustion of the mixture, which destroys the piston group, and it can build up in the grooves of the piston rings, blocking their mobility, and the rings stop removing oil from the cylinder walls, and the charring begins.

The effect of deposits on the operation of the engine is multifaceted:

• 🔥 The heat sink from the piston to the walls of the cylinder decreases, which leads to local overheating of the metal.
• ⚙️ The tightness of the cylinder-piston group worsens, compression and power decreases.
• 📉 Mixing is disturbed, the fuel-air mixture burns inefficiently.
• 💨 The toxicity of exhaust gases increases, the catalytic converter fails faster.

And it's important to note that the formation of soda is a natural process, but it depends on the technical condition of the engine, and the use of low ash oils and high-quality fuels slows this process down, but doesn't stop it completely, and at some point, cleaning becomes necessary to restore the factory parameters.

Chemical methods of decoking

The modern chemical industry offers a wide range of carbon monoxide removal products, which are based on the ability of solvents and alkalis to soften and break carbon bonds at high temperatures, and there are two main applications: adding to fuel and pouring directly into cylinders.

The in-tank method is considered a preventive method, where special additives are mixed with gasoline or diesel and gradually clean the nozzles, valves and surfaces of the pistons during operation of the engine. However, to combat serious ring laying, this method is often too weak, requiring more aggressive formulations poured through candle holes.

Popular types of chemistry vary in composition:

• 💧 Kerosene-acetone mixtures: classic "grandfather" method, cheap, but aggressive to rubber seals.
• 🧪 Specialized foam formulations: contain surfactants that better penetrate into hard-to-reach places and effectively soften coke.
• 🛢️ Oil solvents: are milder, require prolonged exposure, often used in combination with rinsing of the lubrication system.

When choosing a tool, it is important to pay attention to compatibility with engine materials. Some components can cause rubber swelling or washing of the protective film from rubbing vapors. Decoxing should be safe for valves and oil caps, otherwise saving on repair will turn into a replacement of the entire set of gaskets.

Technology of procedure

The process of cleaning the engine without disassembly requires strict adherence to technology; a violation of the sequence of actions can reduce the result to zero or damage the engine. Before starting work, the engine must be warmed to operating temperature to open the thermostat and ensure oil circulation if a comprehensive wash is planned.

The main step involves twisting the spark plugs (or diesel nozzles) and pouring the cleaning liquid into the cylinders. It is important that the pistons are in the middle position, so that the liquid washes both the bottom of the piston and the bottom of the cylinder. After pouring, the candles are twisted back to create vapor pressure, which enhances the effect.

Key stages of the process:

1. Heat up the engine to 70-90 degrees Celsius.
2. Unwringing candles and mounting pistons in the middle position.
3. Pouring the decoker into each cylinder according to the instructions.
4. Exposure within 1-24 hours (depending on the means).
5. Scrolling with a starter without candles to remove any remaining fluid.
6. Assembly, start-up and mandatory replacement of oil and filters.

After exposure, you need to remove the softened soak, and you scroll the engine with the candles twisted out, and the liquid and the dirt are thrown out through the candle wells, and it's best done outdoors or in a well-ventilated room, because the caustic mixture comes out.

Risks and possible consequences

Despite its apparent simplicity, chemical cleaning carries serious risks: aggressive chemistry can damage the lacquer coating on the inside of the piston or cause corrosion of the cylinder walls if there are strong acids or alkalis in the composition, and there is a risk of hydraulic shock if too much liquid remains in the cylinder.

Special attention should be paid to the condition of the oil caps. Old rubber can lose elasticity or break down under the influence of solvents. As a result, after the procedure, the car will begin to eat oil even more actively than before cleaning, this often happens on engines with high mileage, where the rubber elements are already worn out.

⚠️ Attention: It is strictly forbidden to leave aggressive chemicals in the cylinders for a period exceeding the recommended product by the manufacturer. Prolonged contact can lead to leakage of the solvent into the crankcase and destruction of the properties of the engine oil, which will cause oil starvation on the first start.

Another hidden risk is that large pieces of breakaway carbon dioxide enter the exhaust tract, which can damage the valves or disable the turbine and catalyst, so after the procedure, it is recommended that the engine be allowed to work at high revs to burn out the residue of the coal in the exhaust system, but you should do this with caution.

What to do if the compression fell after decoking?

If the compression dropped after the procedure, it could mean that the soot that had previously sealed the gaps in the worn rings was dissolved, in which case the rings became movable, but the wear remained.

Comparison of cleaning methods

The choice of method depends on the state of the engine and the owner's budget. Mechanical disassembly and cleaning give 100% result, but it requires a huge amount of time and money. Chemical cleaning without disassembly is a compromise option, the effectiveness of which varies. Let's compare the basic approaches.

Soft oil extraction is slow, over 200 to 300 kilometers, safer for the oil oil oils, less effective against old, sintered coke, and the hard cylinder method is faster and more powerful, but requires a complete oil change immediately after the procedure.

| Method | Efficiency | Safety for rubber | Cost | Time spent |

| :--- | :--- | :--- | :--- | :--- |

| Disassembly and washing | 100% | High | High | 1-3 days |

| Filling in cylinders | 60-80% | Medium/Low | Low | 2-24 hours |

| Fuel additive | 30-50% | High | Low | 1 tank of fuel |

| Soft (in butter) | 40-60% | High | Average | 200-300 km |

For direct injection engines (GDI, TFSI, EcoBoost), the classic decoking through candle holes only cleans the combustion chamber. The valves remain dirty because the fuel does not wash them. In such cases, special dry cleaning of the intake manifold or ultrasonic cleaning of removed parts is required.

Prevention and further exploitation

Once cleaned successfully, it's important to consolidate the result and prevent new coal from forming quickly. The first step is to replace the engine oil with a quality one, with the appropriate tolerance and ash content, cheap oils burn faster and leave more deposits.

Driving style is also key: Long-term driving at low speeds contributes to the accumulation of soot. Periodically give the engine load: driving on the highway with overtaking or working at high speeds helps the cylinders self-clean. High temperature and gas flow rate blow soot.

Service recommendations:

• 🛢️ Change the oil more often than the regulations, especially when driving in the city (every 7-8 thousand km).
• ⛽ Refuel only at proven gas stations, avoiding fuel with an octane number below the required.
• 🌡️ Watch the temperature regime, do not allow the engine to overheat.
• 🔧 Check the crankcase ventilation system (PCV) regularly to prevent oil theft.

Using fuel additives, injector cleaners every 5-10 thousand kilometers will help keep the nozzles clean, which ensures the correct spraying of fuel, which directly affects the completeness of combustion and the amount of coal produced.

Frequently Asked Questions (FAQ)

Can I do the decoking on a hot engine?

Yes, most instructions require that the engine be warmed to operating temperature before pouring the product, which is necessary to expand the metals and activate chemical processes, but you can't put cold liquid into a hot engine, because you can have a thermal shock and deformation of the HBC.

Should I change the oil after the procedure?

In the process of decoking, some of the chemistry inevitably gets into the crankcase, mixing with the oil and destroying its properties, and even if the oil level has not risen, the lubrication capacity of the mixture is critically low.

Will the engine be able to smoke if the engine is already running?

If the smoke is caused by the oil rings being deposited due to coking, the procedure can help restore mobility to the rings and reduce oil consumption, and if the rings themselves or the guide valves are worn out, the chemistry will be useless and repairs will be needed.

Is the decoking dangerous for the catalyst?

If there's a lot of aggressive chemistry in the cylinders, it can get into the exhaust tract when it starts and damage the catalyst cells or the precious metal layer, and it's important to carefully twist the remaining fluid before starting.