MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
218
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 5-2-5 Removing air intake pipe and air
flow sensor
Removing the radiator assembly
②
(1) Loosen the clip of upper / lower hose for the radiator,
and remove the upper hose.
(2) Remove the hose for overflow tank.
(3) Remove the upper mounting support of radiator, and
remove the radiator assembly, as shown in Fig. 5-2-4.
Removing air intake pipe and air flow sensor
③
(1) Loosen the clip that fixes the air intake pipe and take
down the air intake pipe, as shown in Fig. 5-2-5.
(2) Loosen the clip that fixes the air flow sensor and
take down the air flow sensor.
Attention:
The air flow sensor is a precision part,
and its state has a direct influence on the operation of
the diesel engine. Remove and install with care; do not
collide and keep it clean. Apply special storage after
removal.
Fig. 5-2-6 Removing the air cleaner
Fig. 5-2-7 Removing the engine harness
Removing the air cleaner
④
(1) Remove 3 hexagon bolts fastening the air cleaner
assembly to the frame. See Fig. 5-2-6.
(2) Remove the clamp at the air intake port of the air
cleaner and take down the air cleaner. See Fig. 5-2-6.
Removing the harness
⑤
Remove the harness connectors from electronic control
unit (ECU), fuel injector, high-pressure fuel pump, glow
plug, turbocharger, EGR valve, electromagnetic valve of
A/C compressor and various sensors, etc. respectively.
(2) Loosen the harness clamp and the harness bracket,
and remove the harness. See Fig. 5-2-7.
Attention:
Harness connectors are equipped with
the self-locking devices. Hold the harness connector
stably when pulling it out. It is strictly forbidden to
directly remove the harness with violence.
Air flow sensor
Air intake pipe
