MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
10
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 2-1-4 Intake/Exhaust System
hydraulic lash adjuster, etc.), air filter, intake/exhaust
pipelines, intake/exhaust manifolds, etc. The electric
control EGR valve and EGR cooler contained in the
intake/exhaust systems carry out the exhaust gas
recirculation process, and effectively limit the No
x
constituent in emissions.
Fig. 2-1-5 Turbocharging System
4. Turbocharging System
The turbocharging system of engine is as shown in Fig.
2-1-5.
The function of the turbocharging system is to compress
the air from the air filter through the turbocharger and
then sent the compressed air into cylinder by use of the
exhaust gas energy. Although the working volume of the
cylinder does not change, the air density increases after
compression, and therefore the volume of the actual
intake air increases. In this way, the fuel injected into the
cylinder increases and the fuel burns more fully, and
therefore the power per liter and output power of the
diesel engine are improved.
Fig. 2-1-6 Fuel Supply System
5. Fuel Supply System
The fuel supply system of engine is as shown in Fig.
2-1-6.
According to the work requirements of the diesel
engine, the fuel supply system regularly injects diesel
into the combustion chamber at a specified quantity and
pressure to provide necessary conditions for sufficient
combustion of diesel; at the same time, it adjusts the oil
supply quantity according to the loading condition of the
diesel engine, and ensures a steady output power. The
fuel supply system mainly consists of the fuel tank, fuel
filter, fuel delivery pump, high pressure fuel pump, high
pressure fuel rail, fuel injector, high/low pressure fuel
pipe, and all kinds of sensors, etc.
Cylinder head
installation assembly
Cylinder body
Turbocharger assembly
Oil return hose
component
Oil inlet pipe
component
High
pressure
oil rail
assembly
Oil
injector
assembly
High pressure oil
pump assembly
Cylinder head
Air intake manifold
Cylinder head
installation assembly
Exhaust manifold