diesel engine black Smoke Analysis

Diesel Engine Black Smoke–Black smoke usually the hint of engine failure. With this article, we will give a detailed explanation!

Diesel engine black smoke failure causes

The black smoke in the exhaust is mainly carbon particles from incomplete combustion of fuel. Therefore, the oversupply of fuel in the fuel supply system, the reduction of air in the intake system, the poor sealing of the combustion chamber composed of cylinder block, cylinder head and piston, and the poor quality of injector injection will make the fuel burn incompletely, thus making the exhaust black smoke. Exhaust black smoke mainly for the following reasons.

  1. High-pressure oil pump oil supply is too large or the oil supply of each cylinder is not uniform
  2. Poor valve seal, resulting in air leakage, low cylinder compression pressure
  3. Air filter intake tract blockage, air intake resistance, so that the intake of insufficient air
  4. Severe wear of cylinder liner, piston, and piston ring
  5. Injectors work poorly
  6. Engine overload
  7. The injection pump supply advance angle is too small, and the combustion process is moved back to the exhaust process
  8. Gasoline EFI system control failure, etc.

For black smoke engine can be checked and eliminated through high-pressure pump tuning, injector injection test check, cylinder compression pressure measurement, intake tract cleaning, oil supply advance angle adjustment, gasoline EFI system troubleshooting and other work.

Diesel engine white smoke failure causes

The white smoke in the exhaust is mainly not fully atomized and the combustion of fuel particles or water vapor, therefore, where the fuel can not be atomized or water into the cylinder will make the exhaust white smoke. The main reasons for this are summarized as follows.

  1. Low temperature and cylinder pressure, poor fuel atomization, especially the cold start early exhaust white smoke
  2. The cylinder gasket is damaged and the cooling water seeps into the cylinder
  3. Cylinder block crack, cooling water seepage into the cylinder
  4. Large water content in the fuel, etc.

Cold starts when the exhaust white smoke. White smoke that disappears after the engine warms up should be considered normal. The running vehicle with white smoke is a fault. It should be observed through the water tank cooling water which may not in normal consumption, the work of each cylinder, the oil-water separator may get much water, etc. to c

heck and analyze to exclude the fault parts.

Diesel engine blue smoke fault causes

The blue smoke in the exhaust is mainly the result of excessive oil fleeing into the combustion chamber to participate in the combustion. Therefore, all the causes of oil into the combustion chamber will make the exhaust blue smoke. The main causes are summarized as follows.

  1. Piston ring broken
  2. The oil return hole on the oil ring is blocked by carbon, losing the oil scraping effect
  3. The piston ring openings are turned together, causing the oil to run up from the piston ring openings
  4. The piston ring is severely worn or is stuck in the ring groove by carbon accumulation, losing the sealing effect
  5. The upper and lower direction of the gas ring is installed in reverse, the oil scraped into the cylinder burned
  6. Piston ring elasticity is not enough, the quality is not qualified
  7. Improper assembly of valve guide oil seal or aging failure, loss of sealing effect
  8. Severe wear of piston and cylinder barrel
  9. The amount of oil added is too much, making the oil splash too much, and the oil ring is too late to scrape off the excess oil on the cylinder wall, etc.

Blue smoke from the exhaust gas is bound to be accompanied by increased oil consumption, which some drivers call “burning oil”. Oil, fuel consumption ratio is generally 0.5% to 0.8%, oil consumption

Above this value, blue smoke will be produced in the exhaust. Engine blue smoke fault, generally through the engine disassembly, inspection, in order to find the cause and determine the troubleshooting solution. Cold engine state blue smoke, but the oil consumption is normal, and fuel-related, considered normal.

Engine smoke should generally be checked when the engine is warm, through the engine low speed, medium speed, high speed, and acceleration process of smoke color changes in the analysis.

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