Operating the internal combustion engine under conditions of constant warming up, short trips and the use of fuel with an octane number below the required inevitably leads to the formation of sediments. nagarThe combustible ignition that accumulates on the bottom of the piston, the walls of the combustion chamber and the plates of valves causes power loss, kalyl ignition and increased oil consumption. Many car owners at the first symptoms of unstable engine work begin to plan expensive overhauls, but modern technology allows to effectively combat this problem with less radical methods.
Process scooping It allows you to remove solid carbon deposits without removing the cylinder head or removing the piston group. It saves you a lot of money and time by returning the factory performance to the engine. It's important to understand that chemical cleaning is most effective in the early and middle stages of coking, when the rings are still mobile, but have already begun to lose their tightness due to contamination. Ignoring the problem can lead to cylinder bullying and piston destruction, so timely maintenance is a key factor in longevity. ICE.
There are several proven cleaning methods, varying in aggressiveness of the reagents used and application technology. Some involve the use of professional chemistry, poured directly into the cylinders, others - the addition of special additives to fuel or oil. The choice of the specific method depends on the degree of contamination, engine design (gasoline or diesel, turbine availability) and available budget. In this article, we will discuss in detail the most effective techniques that allow you to restore compression and improve engine performance.
Causes of the formation of sodium and its impact on the work of the ICE
The main cause of solid deposits in the combustion chamber is incomplete combustion of the fuel-air mixture. Under ideal conditions, gasoline or diesel burn completely, leaving a minimum amount of combustion products. However, in reality, especially when the engine is running at low speed or in warm-up mode, some of the fuel does not have time to oxidize and settles on hot surfaces in the form of varnish and soot. Over time, these deposits are sintered, forming solid coke, which is extremely difficult to remove mechanically without disassembling.
The situation is aggravated by the use of low-quality oils Motor oil, when it enters the combustion chamber through worn-out oil-removable rings or valve ossels, burns, leaving ash residues behind, mixed with fuel char, forming a dense crust, especially critical for direct-injection and turbo-charging engines, where temperature loads are higher and the requirements for clean intake and exhaust are stricter.
The effect of coke on engine operation is complex and affects all major systems:
- 📉 Reduced compression: The deposits on the piston rings block their mobility, which is why they cease to fit tightly to the walls of the cylinder, which leads to a breakthrough of gases and loss of pressure.
- 🔥 Kalyl ignition: The red-hot particles of the lobe can act as sources of ignition, causing the mixture to detonate prematurely, which has a devastating effect on the piston group.
- 💧 Deterioration of heat sink: The layer of coar has low thermal conductivity, which is why the piston and cylinder head are worse cooled, which can lead to their thermal deformation or burnout.
⚠️ Warning: Long-term operation of the engine with strongly coked rings can lead to their full occurrence and the appearance of bullies on the cylinder mirror, which will require not chemical cleaning, but mowing of the block.
The method of “soft” decoking through the oil system
The most gentle way to control sediment is to use special washing oils or additives that are added to the lubrication system for a certain number of kilometers before the planned replacement, a method often called “soft”, because the chemical reagents act gradually, dissolving deposits in the crankcase, oil channels and on the side surfaces of the pistons. Washing oil usually poured instead of the old, and the engine runs on it in idle or in gentle operation for about 15-20 minutes.
The effectiveness of this method is that the active components penetrate into hard-to-reach places that cannot be reached by direct pouring into the cylinders. They soften the lacquer films on piston fingers and hydraulic compensators. However, it is worth noting that the soft washing is powerless against a thick layer of hard coke on the bottom of the piston and in the grooves of compression rings, this is more a preventive measure or the first step of complex cleaning before more aggressive procedures.
The process of cleaning through the oil system is as follows:
- 🛢️ Warm up the engine to operating temperature so that the oil becomes more fluid and mixes better with the washing composition.
- 🧪 Pour the waste oil and add the washing liquid (or oil with additive) to the volume specified by the manufacturer of the product.
- 🚗 Drive 100-200 km in a calm mode or let the engine work at idle speeds (for quick flushes), after which be sure to replace the oil filter.
It is important to note that after aggressive washing, it is recommended to shorten the interval of replacement of the next oil. Dissolved dirt and the decay products of additives can quickly contaminate fresh lubricant, reducing its protective properties. For engines with high mileage, where the risk of tearing off large pieces of coal is high, this method can be dangerous, since the detached particles can clog the oil retic.
Use only high-quality washing oils of well-known brands. Cheap analogues can contain aggressive solvents that destroy rubber seals and engine glands.
Hard decoking technology through spark plugs
The most effective and common method of removing the scoop directly from the combustion chamber is hard-coking, and the method is to pour a special chemical directly into the engine cylinders through candle (or nozzle) holes. Active chemistry reacts with the scoop, softening and dissolving it. piston-ring, the bottom of the piston and valves from perennial deposits.
To perform the procedure, the car must be mounted on a flat surface and warmed to operating temperature, then drowned out. Then the spark plugs (or injectors, depending on the design) are twisted out, and a certain amount of liquid is poured into each cylinder through a syringe or tube. The amount of the product is usually 30-50 ml per cylinder, but the exact dosage depends on the instructions of the specific chemical manufacturer. After filling, the candles are twisted back (or the holes are closed with a rod), and the engine is left for a period of 1 to 24 hours.
A critically important stage is the proper preparation and observance of safety:
- 🔧 Make sure the pistons are approximately in the middle position so that the liquid can wash the rings from all sides.
- ⏳ Observe exposure time: overexposure to aggressive chemistry can lead to corrosion of cylinder walls, and underexposure to a low effect.
- 🌬️ After the procedure, be sure to blow the cylinders with compressed air before installing the candles to remove the residues of liquid and dissolved soda.
☑️ Checklist for hard-cooking
After the process of soaking and purging is completed, the candles are put in place, and the engine is started. In the first minutes of operation, the exhaust pipe will come from a thick white smoke with a pungent smell, which burns the residue of chemistry and soda. The engine can work unstable, "troil" until all the chemicals burn out. After warming up and stabilizing the revolutions, you need to immediately go on a trip to finally burn out the residue under load.
The main secret of the success of hard decoking is the mandatory replacement of the engine oil and oil filter immediately after the procedure, since some of the chemistry inevitably enters the crankcase and destroys the properties of the lubricant.
Comparison of popular means for removing scalp
The automotive chemicals market offers a wide range of anti-collection products, from budget domestic developments to expensive imported counterparts. The choice of products depends not only on the price, but also on the chemical composition that determines the aggressiveness of the exposure and safety for engine materials. Some drugs are based on kerosene and acetone, others use more complex organic solvents.
Below is a comparative table of popular tools used for decoking:
| Name of the means | Type of base | Time of action | Efficiency |
|---|---|---|---|
| Lavr ML-202 | Synthetic | 1-2 hours / up to 24 hours | High. |
| Edial | Organic | Work on the move | Medium (prevention) |
| Greenol Reanimator | Petroleum products | 4-6 hours | Very high. |
| Hi-Gear HG3237 | solvent mixture | 30 minutes. | Medium |
It is worth noting that products based on kerosene and acetone (often made independently according to folk recipes) have a high penetrating ability, but can be dangerous for rubber seals and valve oils. Lavr or GreenolThe stainless gases are designed with due regard to compatibility with materials of modern engines, which minimizes the risks of damage, while maintaining a high cleaning capacity.
⚠️ Warning: Do not use acetone in its pure form to decoct aluminum engines! It can react with metal and cause corrosion, as well as damage the lacquer coating of pistons.
Can different tools be mixed?
Mixing different chemicals is strongly discouraged. The reactions between components of different brands are unpredictable and can lead to precipitation or the formation of aggressive compounds that destroy the engine.
Features of cleaning diesel engines and turbo engines
Diesel and turbocharged engines have their own design features that must be considered when excavating. Diesels produce more intensely due to the mixing and higher combustion temperatures.DPF) and exhaust gas recirculation systems (EGR) are extremely sensitive to the quality of combustion and the entry of foreign chemicals into the exhaust tract.
When cleaning turbocharged engines, it is important to avoid large amounts of chemicals from entering the turbine blades, although in most cases the composition passes through the combustion chamber quickly. However, if the turbine has serious backlashes or is worn out, the aggressive liquid can damage the bearing assembly.
The main differences in the process for diesel engines:
- ⚙️ Pouring is made more often through holes for nozzles, which requires more careful handling and cleanliness, so as not to bring dirt into the fuel system.
- ⏱ Exposure time can be increased, as the carbon monoxide in diesels is more solid and dense, but the concentration of active substances should be selected carefully.
- 🌡 After the procedure, a longer warming up and work at high revs is required for complete burning of residues in the exhaust system and particulate filter.
For owners of cars with a system Common Rail In addition, the European Union and modern environmental standards (Euro-5, Euro-6) recommend that you consult the instructions for the car in advance, in some cases, the manufacturer may prohibit the use of certain types of additives, arguing this risk to catalysts and oxygen sensors.
Frequent errors and precautions
Despite the seemingly simple procedure, inexperienced motorists often make mistakes that negate the effect or, worse, damage the engine. One of the most common mistakes is neglecting to change oil. The chemistry that gets in the crankcase is mixed with lubrication, dramatically reducing its viscosity and lubricating properties.
Another mistake is to try to start the engine immediately after pouring liquid without exposure time. The chemistry must have time to dissolve the soda, not just wash it off. Conversely, overexposure to the composition in the cylinders (more than 24 hours) can lead to corrosion of the cylinder walls, especially if they have chon or microrelief, important for oil retention.
List of actions that are strictly not allowed to do:
- 🚫 Leaving a car with chemical indoors without ventilation – the vapors are toxic and fire dangerous.
- 🚫 Trying to “swing” the engine with gas immediately after start-up, if it is strongly triplets - this can lead to a hydraulic shock if there is unburned liquid in the cylinder.
- 🚫 To carry out the procedure on a cold engine - the chemistry works effectively only at certain temperatures, and on a cold engine it just flows into the crankcase.
⚠️ Note: If after decoking oil consumption has not decreased and compression has not leveled, this may indicate mechanical wear of the cylinder group, which cannot be eliminated chemically, in which case engine defects are required.
After decoking, it is recommended that the first 100 km not give the engine high loads and monitor the oil level. You may need to add about 100-200 ml, as part of the new oil will go to lubricate the cleaned rings.
FAQ: Frequently asked questions
How often should the engine be decoding?
Preventive decoking is recommended every 30-50,000 kilometers, especially if the car is mainly operated in urban mode. For older engines with high oil consumption, the procedure can be repeated more often, but with caution, so as not to damage the osteoils.
Will the engine be able to smoke if the engine is already running?
If the smoke is caused by the rings being deposited by the soot, then the decoking is likely to help and the oil consumption will decrease, but if the smoke is caused by wear of cylinders, damage to the turbine or oil caps, chemical cleaning will be powerless.
Do I need to dilute the liquid for decoking?
Most modern tools such as Lavr or GreenolDilution can reduce the concentration of active substances and worsen the result. Always follow the instructions on the packaging of the particular product.
Is the decoking dangerous for the catalyst?
With proper treatment and quality products, the risk to the catalyst is minimal. Most of the carbon monoxide burns in the cylinder or flies out as smoke. However, the introduction of large amounts of liquid chemicals into the exhaust tract can temporarily poison sensitive elements of the neutralization system.