Cause analysis of excessive noise in supercharger operation:

Because the impeller is impacted by foreign objects or deformed with the shell, the high frequency noise is generated by the movement of the gas;

Friction noise caused by impeller and shell collision and poor lubrication of bearing;

The exhaust pipe of the engine running to the turbocharger in the northern part of Baotou is not sealed and leaks, resulting in noise.

Troubleshooting:

When the turbocharger noise is too large, it is necessary to check whether the exhaust pipe seal is reliable, and then check whether the turbocharger lubrication is good, and finally decompose turbocharger, check whether the internal parts damage.

Analysis of overheating reason of turbocharger:

The engine fuel supply advance angle is too small, so that the exhaust temperature is too high, resulting in turbocharger speed is too high, temperature rise;

The injection of poor quality, after burning is serious, cause the exhaust temperature, resulting in turbocharger overheating; insufficient lubrication, lubricating oil pressure of high temperature, insufficient oil supply, heat reduction, supercharger temperature.

The decrease of pressurization pressure leads to the decrease of air flow, resulting in the increase of turbocharger temperature.

Troubleshooting:

When the turbocharger is overheated, the fuel timing and fuel injection quality of the engine should be checked first, and then check whether the turbocharger oil supply is normal, and finally check whether the internal parts of the supercharger are damaged.

Cause analysis of abnormal damage of turbocharger:

The lubricating oil is not clean, the working speed of the supercharger is more than 6000 rpm, and its bearings require liquid lubrication. Therefore, the cleanliness of lubricating oil has a great influence on its service life;

The lubricating oil pressure is low and the fuel supply is insufficient. The pressure of the lubricating oil of the supercharger is usually above 200 thousand kPa, and the low oil pressure will cause insufficient oil supply to the bearing, thus losing the liquid lubrication condition and causing abnormal wear of the bearing.

Troubleshooting:

In the use of the process should pay attention to the cleanliness of lubricating oil, regular inspection and maintenance of Baotou North rush fittings air filter, to ensure the pressure of lubricating oil, when the pressure is insufficient to timely troubleshooting.

Cause analysis of pressurization pressure drop:

The intake resistance increases, which includes dirt in the filter, dirt in the intercooler and dirt in the intake volute;

The compressor speed drops, including turbine carbon deposition, turbine exhaust resistance increase, bearing wear, rotor and shell scraping, altitude increase, etc..

Troubleshooting:

Clean air filter. After the air filter is blocked, the intake resistance of the compressor increases, leading to the decrease of the pressure of the booster;

Cleaning Baotou North ran cooler relaxation compressor accessories, internal cooler and compressor product of sludge, dust will increase air resistance, middle cooler inlet and outlet pressure difference exceeds the technical standard, it should be cleaned inside channel. When oil sludge and dust are thrown into the volute and impeller of the compressor, it should be cleaned and regularly carried out;

The carbon accumulation in the turbocharger increases the rotational resistance of the rotor, reduces the turbocharger speed and reduces the pressure of the booster. Carbon deposition usually exists in the turbine blade, rotating shaft, seal ring and other parts, generally due to lax sealing, oil leakage into the sintering and fuel combustion incomplete;

Check the axial and radial clearance of the rotor, eliminate the scratch phenomenon. When the axial clearance of the rotor is too large or the deformation occurs, the rotor speed will decrease, leading to the decrease of the pressure of the booster. Therefore, the radial clearance and axial clearance of the rotor must be measured carefully when the turbocharger is decomposed and repaired, and the phenomenon of scratching is observed.

Analysis of early wear of turbocharger bearing:

When the engine is started in winter, throttle or start immediately;

Engine flameout before the throttle immediately after flameout, so that the rotor shaft due to instantaneous high speed rotating oil loss burned bearings;

Stop the vehicle in the long term, restart without pre lubrication turbocharger, the rotor bearing oil and burn.

Troubleshooting:

When the diesel engine starts, the oil pressure and temperature of the oil engine must be started after the normal start. Especially when the cold car starts in winter, the idle speed must be started after heating up, and the throttle should not be stopped at the same time;

The diesel engine must be idle for 3-5 minutes before flameout, and the engine can be stopped when the turbocharger speed is reduced;

For the newly opened vehicle, it is necessary to lubricate the supercharger first. The method is to remove the oil inlet pipe of the turbocharger, and pour a proper amount of clean oil into the oil inlet so as to realize the lubrication of the turbocharger bearing and rotor.