1.Turbocharge running noise is too high
Analysis:The impeller is affected by the foreign body or the collision with the shell, which makes the motion of the gas change and produces the high frequency noise.
Friction noise of impeller and shell and bearing lubrication; The exhaust line between the engine and the turbocharger is not sealed, leakage and noise.
Troubleshooting: We should first check whether the exhaust line sealing is reliable, then check that the lubrication of the turbocharger are in good condition, the decomposition turbocharger, check the internal parts for damage.
Analysis:The engine oil supply is too small in advance and the exhaust temperature is too high, causing the turbocharger’s speed to be too high and the temperature rising.
The injection quality is poor and the latter is serious, resulting in an increase in exhaust temperature, which causes the turbocharger to overheat.Poor lubrication, insufficient lubricating oil pressure, excessive oil temperature, insufficient fuel supply, reduced heat loss, and increased the temperature of the turbocharger;
The pressure of pressurization decreases, resulting in the decrease of air flow, resulting in the temperature increase of the turbocharger.
Troubleshooting:First check engine oil supply timing and oil injection quality; Then check whether the turbocharger lubricant supply is normal and check whether the internal parts of the turbocharger are damaged.
Analysis:The lubricating oil is not clean, the working speed of the turbocharger is above 6000 RPM, and its bearing requires liquid lubrication, so the cleanliness of the lubricating oil has a great influence on its service life.
Low oil pressure and insufficient fuel supply.The pressure of turbocharger lubricating oil is usually more than 200 kpa, and the low oil pressure can cause the oil shortage of the bearing, thus losing the lubrication condition of the liquid and causing the abnormal wear of the bearing.
Troubleshooting:Pay attention to the cleaning of lube, check and maintain the air filter regularly, to ensure the lubricating oil pressure, to timely troubleshoot when the pressure is insufficient.
Analysis:The intake resistance increases, it includes the filter element, the viscerate and the air intake volute.
The compressor speed decreases, it includes the turbine has the carbon, the turbine exhaust resistance increases, the bearing wear, the rotor and the shell have the scrape, the elevation height increases.
Clean air filters.After the air filter is blocked, the air intake resistance of the compressor increases, resulting in a decrease in pressure pressure.
Cleaning compressor, compressor internal product of oil sludge, can increase the intake resistance, dust of differential pressure at the inlet and outlet of the cooler than technical standards, internal channels should be cleaning it.The air compressor casing and the impeller should be broken down and cleaned when they are put on oil and dust, and should be carried out on a regular basis;
The inner product of the turbocharger increases the rotation resistance of the rotor, reduces the speed of the turbocharger and lowers the pressure pressure.Carbon product is usually deposited in turbine blades, rotating shaft, sealing ring and other parts, usually because of tight seal, oil leakage into sintering and fuel combustion not completely;
Check the axial and radial clearance of the rotor and eliminate the scratches.If the axial clearance of the rotor is too large or the deformation occurs, the rotor speed will decrease, leading to a decrease in pressure.Therefore, the radial clearance and axial clearance of the rotor should be measured carefully when decomposing maintenance turbocharger, and observe whether there is a scratch phenomenon.
5.Early wear of turbocharger bearing
Analysis:When the engine is started in winter, it can be launched with a bang or an immediate start;
The engine flameout before the engine flameout, which causes the rotor shaft to be burned by instantaneous high-speed rotation.
The long-stalled vehicle has no prelubricated supercharger when rebooting, making the rotor lack of oil and burn the bearing.
Troubleshooting:When the diesel engine starts, it must wait for the oil pressure and temperature of the oil to start again, especially when the cold car starts in winter, it must be idle before starting, and avoid the throttle.
The diesel engine must be idle for 3-5 minutes before the engine is out of fire.
With the new open, the vehicle must first lubrication turbocharger, the method is: remove the oil inlet pipe of the supercharger from the inlet into the right amount of clean oil, in order to realize the turbocharger rotor bearing and lubrication.