MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
404
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 6-2-10 Removing the fuel injector
harness plug
Fig. 6-2-11 Removing the fuel return pipe
components
Fig. 6-2-12 Removing the fuel inlet pipe of fuel
injector
Removal
Removing the fuel injector harness plug
①
Loosen the plug of diesel engine harness plug-in
connected with fuel injector electromagnetic valve. See
Fig. 6-2-10.
Removing the fuel return pipe assembly
②
(1) Remove the support and pipe clamp of fuel return
pipe.
(2) For the DELPHI fuel injector, pull out 4 fuel return
pipes connected with the fuel injectors, and then take
down the fuel return pipe components. See Fig. 6-2-11.
(3) If a BOSCH or XINFENG fuel injector is chosen,
push the clamp spring out with a tool, then pull the fuel
return pipe connector out from the injector, and finally
take down the fuel return pipe assembly.
Removing the fuel inlet pipe of fuel injector
③
(1) Use a spanner to uniformly loosen the pipe
connectors used to fasten both ends of 4 fuel inlet pipes
of fuel injector. See Fig. 6-2-12.
(2) Take down 4 fuel inlet pipes of fuel injector
separately.
Warning:
(1) When removing them, ensure that the pipe
connectors on both ends of fuel inlet pipes shall be
simultaneously and uniformly loosened to avoid any
deformation of these pipes.
(2) After removing the fuel inlet pipes, cover the fuel
injector inlet, the high-pressure fuel rail inlet and both
ends of fuel inlet pipes by the clean plug covers to
prevent the fuel injector from being blocked by foreign
matters.
Removing the fuel injector
④
(1) Remove the fastening bolts of fuel injector ballast.
See Fig. 6-2-13.
(2) Take down the fuel injector ballast.
(3) Gently take out the 4 fuel injectors inserted in their
holes.
Attention:
properly protect the fuel injectors after
removing them. Carefully place and mark them in
accordance with cylinder numbers 1, 2, 3 and 4 to avoid
any bumping or pollution.
Attentions:
Fuel return pipe
components
Fuel injector
intake pipe
