MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
388
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 6-1-10 XINFENG M680 high-pressure
fuel pump assembly
Fig. 6-1-11 Installing the DELPHI DEP3.4
High-pressure Fuel Pump
Fig. 6-1-12 Installing the BOSCH CP1H
high-pressure fuel pump
The GW4D20B turbocharged diesel engine having a
BOSCH common-rail system is equipped with a
BOSCH CP1H high-pressure fuel pump as shown in
Fig. 6-1-9.
The BOSCH CP1H high-pressure fuel pump is an
in-line three-plunger pump, with a maximum injection
pressure of 1600 bar.
2.3.3
XINFENG M680 High-pressure Fuel Pump
The GW4D20B turbocharged diesel engine having a
XINFENG common-rail system is equipped with a
XINFENG M680 high-pressure fuel pump. See Fig.
6-1-10.
Technical parameters of XINFENG M680 high-pressure
fuel pump:
Rated rail pressure: 1500 bar.
Rated speed: 4000 r/min.
Theoretical output: 380 mm
3
/r/min.
The XINFENG M680 high-pressure fuel pump is
equipped with a proportional solenoid valve, which
controls the internal pressure of rail.The high-pressure
fuel pump has a sliding sheet type fuel delivery pump,
which provides a fuel delivery pressure of 0~8 bar.
XINFENG M680 high-pressure fuel pump is a in-line
two-cylinder plunger pump and can withstand a certain
axial force.
When replacing or removing the XINFENG M680
high-pressure fuel pump, fill 15mL of diesel oil to the
fuel delivery pump before the reinstallation, or use the
manual fuel pump on fuel-water separator to expel the
air and add the fuel before the start of engine.Before
you perform this work, the start of diesel engine is
forbidden to avoid the damage to high-pressure fuel
pump.
The XINFENG M680 high-pressure fuel pump is
attached to the diesel engine by 3 M8 bolts, and its front
leans against taper-face driving gear, which is tightly
pressed by M14×1.5 nuts.
Tightening torque for compression nuts of driving
gear:
90 N•m ~ 95 N•m
2.3.4 Precautions for Using High-pressure Fuel Pump
(1) The air in the low-pressure circuit of high-pressure
fuel pump shall be exhausted before you start the
engine.When using the manual fuel pump, carefully
check and ensure that there are no leakage points
(2) The inlet pressure (absolute pressure) of vane type
fuel delivery pump shall range between 0.35 bar and
1.00 bar (the fuel tank shall be ventilated).
Cylinder body
Cylinder body
