The appearance of foreign knocks, reduced traction and increased fuel consumption often signal a critical condition of the piston group. The coar on the walls of cylinders, pistons and valves is a natural result of combustion of the fuel-air mixture, especially when using low-quality fuel or oil with a lot of additives. If you ignore the symptoms of coking, you can encounter potassium ignition or even the wiring of the rod liners, which will require major repairs.
Fortunately, the modern chemical industry offers solutions that allow for efficient cleaning without dismantling the power unit. scoopingIt helps dissolve solid deposits and get them out through the exhaust system, and in this article we will discuss in detail how to wash the engine from the stain without disassembling at home, using available means and observing safety precautions.
Causes of the formation of sodium and its impact on the work of the ICE
The main cause of solid deposits is incomplete combustion of fuel. In urban operating mode, when the engine is often running at idle speeds or in traffic jams, the temperature in the cylinders may not be sufficient to completely burn out all components of the mixture. carbonaceous They settle on hot surfaces, forming a hard crust, and over time, this crust grows, reducing the volume of the combustion chamber and disrupting the heat sink.
The particular danger is that the oil rings are coking, and when the rings lose their mobility because of the soot, they stop effectively removing oil from the cylinder walls, and the oil goes into the combustion chamber, where it burns, and it forms more soda, and it becomes a vicious circle, and the owner notices that the engine starts to "eat" oil, the exhaust pipe is smothered with blue smoke, and the spark plugs are covered with black coating.
The effect of sediment on engine life is hard to overstate. Increased thickness of the coke leads to increased compression (or fall when the rings are in place), detonation and overheating. Valves can stop snugly fitting to the saddles, which reduces power and causes ignition misses. Timely flushing allows you to break this vicious circle and prolong the life of the engine without costly intervention.
⚠️ Note: If the engine has mechanical damage, such as bullies on the cylinder mirror or wear of the shaky piston group, chemical flushing can aggravate the situation by washing out the wear products and clogging the oil channels.
Before the procedure, be sure to measure the compression in all cylinders - this will help to assess the degree of coking and understand whether there is a sense in washing.
Selection of means for decoking: a review of effective compositions
The automotive chemicals market offers a wide range of anti-sulphur products, which can be divided into several categories according to chemical composition and operation principle, the choice of the right remedy depends on the degree of contamination and type of engine, and it is important to understand that cheap five-minute oils, poured into oil before replacing it, are often ineffective against old-fashioned soda on pistons.
The most effective are those that are poured directly into the cylinders through candle holes, and contain aggressive solvents such as: acetone, kerosene Or esters combined with surfactants, which can soften even fossilized soda in a few hours of exposure, and are popular with dimethyl sulfoxide, which is less aggressive to rubber seals but requires longer exposure times.
When choosing chemistry, you should pay attention to the specialization of the product. Some formulations are specifically designed for diesel engines, where the soot has a different structure, for gasoline engines, the ability to dissolve lacquer deposits is more important, and there are soft decoking, added to the fuel, which act gradually, cleaning the valves and combustion chamber during the ride, but they will not replace the full procedure for serious problems.
- 🧪 Aggressive cleaners: contain chlorine and strong solvents, effective against old carbon monoxide, but can damage the catalyst and rubber parts.
- 💧 Oil solutions: poured into the oil filler neck, act gently, primarily clean the oil system and rings.
- ⛽ Fuel additives: added to the tank, provide prevention and easy cleaning during the operation of the car.
Preparation of the engine for the washing procedure
The quality of the result depends on the thoroughness of preparation. Before starting work, the car must be installed on a flat platform and warm the engine to operating temperature. The warm metal expands, which makes the soda more susceptible to chemical effects. In addition, hot oil has less viscosity and drains better on subsequent drainage.
Once warmed up, the engine is silenced and let cool down a little to avoid the risk of burns when the attachment is dismantled, you need to remove the decorative plastic casing, if any, and disconnect the high-voltage wires or ignition coils. At this point, it is important not to confuse the removal of the coils, so that you do not look for what spark is going where, although modern systems are often numbered.
The critical step is to unscrew all spark plugs (or nozzles, depending on the method of access). The resulting holes will be filled with washing fluid. Visually inspect the candles: if they are covered with black oily coating or have red lobe (ferrocene), this confirms the need for the procedure.
☑️ Preparation for decoction
Step by step: how to wash the engine without disassembly
There are two main methods of doing the procedure: soft (through oil) and hard (filling into cylinders). Consider the most effective second method, which allows you to act directly on the piston group. After you twist the candles, you need to turn the crankshaft with a starter to put the pistons in the middle position, which will allow the liquid to access the top and bottom of the cylinder.
The liquid volume depends on the engine volume and the manufacturer's recommendations, usually 40-50 ml per cylinder. After filling the candle, you need to screw back (you can old, not necessarily new) or just plug the holes with the rags so that the vapors do not escape. The engine is left to soak for 6 to 12 hours, periodically (every hour) turning the crankshaft 10-20 degrees for better penetration of the solution.
After the exposure time, the candles are twisted out again, and now you have to remove the remaining liquid and softened soda from the cylinders, and then you have to scrolle the engine with a starter several times, then you have to close the candle holes with a cloth so that the slurry doesn't splash out all the hood space, and then you can twist the new candles and start the engine.
The procedure for scrolling the starter:1. Plug the candle wells with rags.
2. Disable the ignition module (chip).
3. Starter spin 5-7 seconds.
Repeat 2-3 times for each cylinder.
After assembly and first start, the engine will run unstable, there will be strong vibration and smoke from the exhaust pipe. This is normal - burn out the residues of washing and soot. Let the engine run for 10-15 minutes at idle speeds, periodically increasing the speed to 2000-2500 to blow out the cylinders. Then be sure to replace the engine oil and oil filter, as part of the washing may have got into the crankcase.
The main secret of success is not to save on oil after the procedure. The washing fluid reduces the lubricating properties of the oil, so replacing the filter and oil is mandatory immediately after decoking.
Comparison of cleaning methods: efficiency table
To choose the best way to deal with stain, it is worth comparing different approaches. Each method has its advantages and disadvantages, which depend on the condition of the engine and the owner's budget. Below is a comparative description of the main methods of cleaning.
| Method | Efficiency | Risk to the engine | Cost |
|---|---|---|---|
| Filling in cylinders | High. | Medium (aggressive chemistry) | Medium |
| Butter supplement | Low/Medium | Low. | Low. |
| Fuel additive | Low (prevention) | Minimum | Low. |
| Hydrogen flushing | Medium | Low (equipment required) | High. |
The most radical and effective method is to put chemistry in cylinders, which allows you to physically dissolve the deposits where they are most dangerous, but this method requires strict adherence to the technology, but oil additives work more as a prevention or a means to remove light deposits, but they will not be able to stir completely the fallen rings.
Hydrogen washing (HHO) is a modern method that delivers rattles gas to the engine, burns at high temperatures, burning off the soda. It is safe for rubber seals, but requires a specialized service and costs more. Chemicals with cylinders are the best method for home use.
Possible risks and precautions
Despite the apparent simplicity, the procedure of decoking carries certain risks: aggressive chemical compositions can damage the valve ossels (oil caps), especially if they are already worn or made of poor-quality rubber. After washing, oil consumption can increase if the caps lose elasticity and stop holding oil.
Another risk is that you get a lot of softened soda into the oil ducts, and if the dirt gets into the oil gutter, the engine can get oil starvation, with all the consequences that come with it, which is why after the procedure, you can get it. oil-change And the filter is not just a recommendation, it's a requirement, and ideally, after 500 kilometers of running, the oil should be replaced again.
⚠️ Warning: Never leave aggressive chemicals in the engine longer than the time specified in the instructions. Overexposure can lead to corrosion of the cylinder walls and damage to the antifriction coating of the pistons.
What to do if the compression fell after decoking?
If the compression fell after the procedure, it could mean that the coar that served as a seal between the piston and the cylinder was washed away. In older, high-mileage engines, this often leads to the need for ring replacement or overhaul, as the chemistry revealed the real wear concealed by the coar.
Also, you should be aware of the toxicity of exhaust gases during the procedure: all work should be done outdoors or in a well-ventilated room; solvent vapors and carbon monoxide combustion products are harmful to the human respiratory system; use personal protective equipment such as gloves and a respirator when working with chemistry.
Frequently Asked Questions (FAQ)
Can I use a cold engine to drive?
It's not recommended. On cold metal, the chemistry works worse, and the risk of water shock is higher when run, because the viscosity of the liquid is higher. Warming up to operating temperature is mandatory for pistons to expand and liquefy the soda.
Do I need to dilute a special liquid for decoking?
Most of today's pre-made formulations (such as Lavr, Gzox) do not require dilution and are ready to use. If you use a mixture of acetone and kerosene, they are mixed in a ratio of 1: 1 or 1: 2.
Will the flushing help if the engine already consumes a liter of oil per 100 km?
This oil consumption indicates critical wear of the cylinder piston group or the occurrence of rings that can no longer be returned by chemistry.
How often should you do a decoding for prevention?
Experts recommend that preventive cleaning be carried out every 30-40 thousand kilometers of mileage, especially if the car is mainly used in urban mode, this will prevent the formation of solid coal.
Is the decoking dangerous for the catalyst?
Yes, the decomposition products and the residues of aggressive chemistry can quickly disable the catalytic converter, so it's best to do the procedure before you change the oil, and after you start, the engine has to run until the catalyst warms up to burn out the residue, but long-term work on singles with chemicals in the exhaust harms it.