What to do if you detect dense white smoke
When disassembling the cylinders, it is necessary to analyze the condition of the spark plugs.
The formation of scale on the candles indicates that water has gotten inside. After examining all cylinders and glow plugs located in them, it is necessary to repair or replace the cylinders and glow plugs. It is recommended that these measures be carried out with the help of qualified technicians at the nearest service station. Often, low-quality coolants, when in contact with the working elements of the engine, cause increased corrosion of components and parts of the power unit. Cheap varieties of antifreeze can literally corrode the internal parts of the engine when leaks occur. After such an impact, it is not possible to repair damaged parts.
To ensure that the coolant penetrates into the combustion chamber, it is necessary to remove the cap from the expansion tank. A sharp burning smell, a decrease in the level of antifreeze in the tank, and a floating oil film indicate the detection of this defect.
It's all about oil
Why does a diesel engine smoke: causes and solutions
With this diagnosis, the “cloud” from the exhaust pipe will smoke from light to dark shades. It will depend on the concentration of oil that flows into the combustion chambers, engine operating conditions and warm-up temperature. At the same time, you will feel the burnt smell characteristic of the oil.
The appearance of such gas will be indicated by increased oil consumption. To solve this problem, you need to decide on suppliers of “unnecessary” fluid.
Wear of the cylinder-piston group
Very often, a diesel engine produces bluish smoke due to wear of the cylinder-piston group and timing components (gas distribution mechanism). Oil can get into the cylinder for several reasons.
- The piston ring clearances have been increased.
- The gaps between the valve stems and guide bushings have been increased.
- There is damage on the cylinder liner.
- The rings are destroyed.
- There are violations of the piston grooves and many other reasons.
For example, severe gap defects in the area of the piston grooves allow the combustion chamber to “suck” oil. This is possible even if the oil scraper rings are in good condition. With a long period of operation, the cylinders can change their shape, for example, become elliptical. Due to changes in shape, compaction deteriorates.
Wear of this group of parts also causes a decrease in compression. When measuring compression, it is worth taking into account the ability of the oil to seal gaps. It turns out that if the cylinder is faulty, then the compression should be too high. To carry out diagnostics of the CPG (cylinder-piston group), take measurements and obtain an accurate assessment, certain requirements must be met.
If the mechanisms do not have a very large deterioration in quality, then the notorious smoke can be seen when the engine warms up. After warming up, the level of the symptom decreases or disappears completely. This is explained by the fact that at high temperatures the parts expand and the gaps become sealed.
An increase in oil consumption occurs when the bridges between the piston grooves break down. Also, high oil consumption is caused by broken rings as a result of wear or overheating of the engine. If you use low quality oil and do not change it on time, the piston rings seem to “stick” and lose their mobility.
Deterioration of the piston rings and cylinder seals will cause increased fuel consumption.
Timing belt faulty and other reasons
Oil smoke can be caused by the following:
- Burnt or damaged valves.
- Worn valve stems and guides.
- Malfunctions in valve stem seals.
Why blue smoke is emitted on a warm engine can be explained by relying on the fact that the oil dilutes with increasing temperature of the internal combustion engine. The following example can be given. This can always be observed when tractors are operating.
It often happens that when the engine is idling, oil accumulates on parts, forming films, thereby accumulating in the exhaust system. Then when the tractor driver presses the gas pedal, the exhaust pipe splashes out thick blue smoke.
The fuel supply system may be faulty or the valves may not be tight. All this can cause a diesel unit to smoke blue. A burnt-out valve gives the exhaust gases a white-bluish tint. This valve defect can be traced to the low compression of the faulty cylinder. Plugs are also susceptible to carbon deposits and deposits, which will indicate this deficiency.
Turbine malfunctions are possible. They may resemble the symptoms of unhealthy valve stem seals. To make sure of this, you can probe the turbocharger pipes for the presence of oils. Turbocharger seal problems are more difficult to identify because the oil that enters the exhaust system burns completely.
Also, the causes of blue smoke may be malfunctions of the crankcase ventilation or problems with ignition in the cylinder. Very often, blue smoke is accompanied by a decrease in thrust, and atmospheric and turbo diesel engines may have seal leaks, etc.
It is worth noting that the reasons for this behavior of the car may be poor fuel quality. Therefore, you should only refuel from those companies that provide good quality fluids. Beware of gas stations that offer diesel fuel at a low price.
The influence of the quality of the oil used on smoke formation
Motor oil must have certain characteristics. The quality of the lubricant used directly depends on its properties. If the car engine contains low-quality oil, the viscosity coefficient of which does not correspond to the car brand, or if the temperature inside the engine increases, a sharp loss of useful properties of the lubricant occurs, this leads to serious damage to the elements and systems of the power unit. If blue smoke appears, you need to check the oil for compliance and, if necessary, completely replace it.
The appearance of smoke can be caused by a number of other reasons - from the appearance of microcracks in the engine body to the use of the wrong type of fuel intended for a given engine brand. Each specific situation always has a solution when seeking help from qualified specialists.
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