MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
406
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 6-2-16 Installing the fuel return pipe
components
Fig. 6-2-17 Installing the fuel injector harness
plug
the fuel inlet pipes of injectors are sealed so strictly that
no oil leakage will occur.
Tightening torque of fuel inlet pipe connector of fuel
injector:
32 N•m±3 N•m
Attention:
make sure to simultaneously and
uniformly tighten the pipe connectors on both ends of
fuel inlet pipes when tightening these fuel inlet pipes of
injectors, so as to avoid any deformation or damage to
them.
Installing the fuel return pipe assembly
②
(1) (1) For the DELPHI fuel injector, insert respectively
the fuel return rubber hoses into 4 injector heads and
position them in place. See Fig. 6-2-16.
(2) (2) For the BOSCH or XINFENG fuel injector,
remove the dust cap from the upper end of the fuel
injector. Install 4 short connectors of the fuel return
pipes in 4 holes at the upper ends of the fuel injectors,
and fix them tight with spring clips. Install the other long
connector to the fuel return tee connector on the high
pressure pump, and fix it tight with a clip.
(3) Install the support and pipe clamp of fuel return pipe.
After the installation, make sure the fuel return
pipe is sealed so strictly that no fuel will leak from it.
Installing the fuel injector harness plug
①
Insert the fuel injector harness plugs on diesel engine
harnesses separately into 4 fuel injectors. See Fig.
6-2-17.
Attention:
Do not insert them in wrong positions.
Fuel return hose
component
