Lovol 1004-4, User Handbook Manual, Page: 69 / 87

The use and maintenance of the turbocharger
Tianjin Lovol individual pump engine adopts the GARRETT Turbo charger. Then
take the Garrett Turbocharger as an example to conduct description.
1.
1. 1.
1.
the work principle of a turbocharger
1.1 The work principle and function
The turbine in the turbocharger is propelled by the engine’s exhaust gas, which in turn drive the compressor.
Thus the intake air amount and pressure will be increased and the combustion will be improved.
The fuel economy will be improved. The exhaust pollution will be decreased. The power output will be
enhanced plateau boost.
1.2 lubrication systems
the function of the lubrication system
to cool the turbine
to lubricate the gear system
to provide support for the rotor dynamic balance.
1.3 sealing system
the sealing of the turbocharger is a dynamic one. The sealing system will function well only when the engine is
running and the air pressure inside the compressor housing and turbine housing is built up and is bigger than the oil
pressure of the middle body. All the reasons which lead to fail building up air pressure or larger oil pressure of the
middle body than that in both turbine housing may cause a leakage in the turbocharger.
2. Instructions for operation
2.1 The turbocharger should be lubricated with engine lubricating oil, and the oil grade should be CD or above. All
the lubricating oil should flow through a filter which can prevent all particulates with a size of over 20
µ
m.
2.2 The turbocharger should be lubricated beforehand under the following circumstances:
The engine has been out of work for a long time.
After changing lubricating oil or maintenance (including discharging lubricating oil). Within 3 to 4 seconds after
the engine is started, the oil pressure at the turbocharger inlet should be about 69 kPa (0.7kgf/cm
2
)
3. When the engine is running with load, the lubricating oil pressure at the turbocharger inlet should be within the
range from 196 kPa to 392 kPa (2.11 kgf/cm
2
to 4 kgf/cm
2
) when the engine is running under the maximum torque or
at higher speed.
4. The lubricating oil inlet temperature should be usually under 100
, and should not exceed 120
℃ ℃
under any cases.
5. Neither liquid sealing strip and joint, nor fluid sealant should be applied to the sealing position.
6. The engine should not be running idle for a long time (over 20 minutes).
If the gas pressure in the turbine and compressor is too low, and the turbocharger axle is rotating at a low speed,
the lubricating oil in the center housing may leak into the turbine and compressor housing.
7. It is strictly forbidden to run at the mode of “acceleration—stop—running idle”.
8. The engine should first run idle for 3 to 5 minutes to build up the lubricating oil pressure. If the engine is
accelerated once it is started, the turbocharger gear will have to work at the maximum speed without being fully
lubricated, and as a result it will be damaged.
9. The engine temperature and speed should be decreased gradually from their maximum values within 3 to 5 minutes
before the engine is stopped. When the power output or torque output reach their maximum values, the turbocharger
temperature and speed is also the highest. Then the engine should run with light duty or idle for a while, meantime
the lubricating oil pressure and the amount of air flowing through cooling system should be kept constant. This can
prevent the turbocharger from running in short of lubricating oil, and prevent the lubricating oil in the gear and center
housing from being burnt and leaving the residue.
11.02