MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
426
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 7-2-32 Determining the opening pressure
of Pressure Valve for radiator cap
Fig. 7-2-33 Checking the coolant leakage
Fig. 7-2-34 Installing the radiator assembly
replaced.
Opening pressure of vacuum valve:
12.8~17.0 kPa
2. Checking the Radiator Core
(1) The deformation of radiator fins will lower the effect
of heat dissipation and causes the overheat to the
cooling system. Level the radiator fins, but do not
damage the roots of radiator fins.
(2) Remove all dust and other foreign matters from the
radiator core.
3. Rinsing the Radiator
Rinse the radiator inside and the coolant passage by
the water and neutral cleaning solution. Remove all
incrustation and scale.
4. Checking the coolant leakage
Send the compressed air with a pressure of 196.9 kPa
from the radiator filling hole into the radiator inside by
using the radiator cap tester, and check the cooling
system for leakage. See Fig. 7-2-33.
Tester for the radiator filler cap: 5-8840-2036-0
Installation
Installing the radiator assembly
⑤
(1) Install the radiator assembly which has some
hoses. See Fig. 7-2-34.
(2) Use the specified torque to tighten the bolts
connecting the radiator with the upper support.
Tightening torque for the fastening bolts of
radiator:
23 N•m ± 3 N•m
Caution:
Do not let the fan vanes scratch the
radiator core during the installation.
Installing the radiator fan
④
(1) Install the radiator fan to the radiator, and tighten
the fastening bolts by the specified torque. See Fig.
7-2-35.
Tightening torque for the fastening bolts of
radiator fan:
