(1) diesel engine starting and acceleration

After the engine starts, the turbocharger starts running. Always low speed 3-5min, the oil temperature rise in standby, better flow properties, the turbocharger sufficiently lubricated, and further increase the speed with load operation at high speed to ensure that the turbocharger rotor shaft and the bearing lubrication avoid turbocharger rotor shaft and bearing friction appears dry or oil-burning engine load increase card phenomenon.

Longer downtime diesel should do pre-lubricated with machine oiler to turbocharger inlet inject a certain amount of oil, and turn the impeller by hand to ensure that the turbine rotor shaft and bearing a floating bearing oil film to protect the engine flameout before, to gradually reduce the load, idling 3-5min then shut down to prevent coking and bearing damage; Also, not long engine idling, which increases fuel consumption, increased engine wear, also because of the turbocharger lubrication pressure is too low and poor lubrication, leading to early damage. To this end, idling time generally should not exceed 10min.

(2) empty load operation

Avoid prolonged low idle, idle time is too long, the exhaust-side positive pressure is too low, the turbine end unbalanced pressure on both sides of the sealing ring, oil will leak into the turbine housing. If the leak is very minor, it will burn without failure under load, but it will pollute the turbine blades. So, do not let turbocharged diesel engine running at idle than 10min.

(3) Stop

High-temperature, high-speed operation of the engine can not be stopped suddenly to avoid oil interrupted, causing the turbocharger shaft and sleeve between "killed." Once stopped, the communication of the turbocharger lubricating oil flow is stopped. If at this time the temperature of the exhaust manifold is high, the heat will spread turbocharger housing, will stay there the oil boiled coke. When this coke piled up for a long time will clog the inlet, causing the sleeve in oil, accelerated wear between the shaft and the sleeve, and even "killed" serious consequences occur. Therefore, we must first stop before unloading the diesel engine to idle, standby temperature drops after flameout.

After the shutdown, the oil pump does not work, the oil pressure rapidly to zero, however, as long as the supercharger is still rotating, the need for lubrication and cooling oil, once off the oil remaining in the interior of the turbocharger oil due to high temperature carbonization shaft neck bearings and thrust bearings will soon sintering.

When the diesel engine, the turbine exhaust directly exposed to high temperatures. If you suddenly stop at full speed, high-temperature turbine impeller and the casing will transfer to the rotor shaft, bearings and seal rings floating temperatures as high as 200-300 ℃, if no oil lubrication, cooling, enough blue discoloration of the rotor shaft . After a few minutes before stopping idling, the temperature of the internal parts of the turbocharger will fall significantly. Therefore, before the shutdown, should be gradually pulling small throttle, idling 3-5min after shutdown.

(4) preventive maintenance

When using turbocharged diesel engine, a good maintenance habits, especially for air filter, oil and oil filter, etc. To do periodic replacement.

A, high turbocharger rotor shaft and bearing lubricant requirements, supercharged diesel engine oil must be used in accordance with the technical specifications. Oil should be kept clean and free of dirt, wear and tear, such as the oil mixed with dust, sand and metal shavings and other impurities tablets will accelerate bearing turbocharger serious cause friction blades and the casing leaving speed down cause turbocharger and engine performance deteriorated sharply, power down occurs, smoke too much, noise increases, severe oil outflow ends of the rotor shaft and exhaust pipes and so on. Therefore, we must strictly in accordance with the technical specifications for diesel mandatory maintenance, periodic inspection, cleaning or replacement of engine oil and oil filter cartridge.

B, to ensure good engine lubrication system to ensure the smooth flow of the pipeline for all channels, there is enough oil flow and pressure. If the lubricating oil passage blocking, high-speed operation of the turbocharger in a short period of time, the turbine rotor shaft may cause severe wear and floating bearing, so turbocharger failure.

C, to ensure that the pipe securely fastened and sealed, such as air filter to the compressor, the compressor to the engine intake manifold, turbocharger and diesel engine exhaust pipe tubing. The sealing principle turbocharger with other low-speed mechanical completely different, which on both sides by a turbine rotor shaft sealing rings, the gas pressure within the housing to seal the two, the inner sides of the housing intermediate the gas back pressure is significantly higher than oil pressure in the chamber, in order to achieve sealing. When connecting pipeline booster leak occurs, it will cause the gas pressure imbalance on both sides, both sides or one side of the booster causing oil spills.

D, when replacing the turbocharger, should be injected at the inlet of the little oil, after the oil started flowing recognized until the return port, turbocharger oil must be above the level of CD-quality oil; while replacing the oil filter, and attention must be replaced with the original machine turbocharger matching, otherwise, make diesel temperature excursions, power down, or even not work.
E, for diesel engine condition monitoring, regular inspection, note any abnormal sound or turbocharger increased vibration phenomena; checking turbocharger compressor impeller (cold) and case temperature should be hot, tubing and fittings are There shall be no leakage. Note exhaust smoke color, whether crankcase blow-by gas, oil temperature, oil consumption, oil pressure and abnormal noise.
F, use a clean soft water and the specified grades of oil.

Turbocharger related symptoms, mainly for poor diesel exhaust smoke color (black smoke or blue smoke), turbochargers abnormal noise (noise is too large, raw sound that period surge, howling), oil spill (from the side or the turbo compressor impeller side) and hot (red) and so on.

(5) random checks

When a turbocharger failure, do not immediately remove the supercharger assembly, but the intake pipe between the air filter and compressor disengaged, turning agility tests: compressor wheel with a finger slide , the rotor should not astringent, no catching, and rely on inertial rotation over 2-3 laps, while the exhaust turbine and compressor wheel in the process of turning the shell collision phenomenon.