MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
412
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 7-1-3 Installing the thermostat
Fig. 7-1-4 Radiator of cooling system
Fig. 7-1-5 Radiator fan assembly of cooling
system
2. Thermostat
(1) The thermostat is wax pill type one and a small
swing valve (rock valve) is on the valve. See Fig. 7-1-3.
(2) Its initial and full opening temperatures are
respectively 76
℃
± 2
℃
and 88
℃
. Its full opening
stroke is not less than 8.5 mm.
(3) The thermostat is installed inside its cap. See Fig.
7-1-3.
3. Radiator
(1) The radiator is ribbon-tubular type one. See Fig.
7-1-4.To elevate coolant boiling point, a valve with cover
is mounted on the radiator. This valve opens at a
pressure of 88~118 kPa.
(2) The overflow rubber pipe of radiator is connected
with overflow tank as shown in Fig. 7-1-4.
(3) A drain plug (water drain switch) is attached at the
bottom of radiator water chamber.
(4) A fan assembly is installed in front of the radiator as
shown in Fig. 7-1-5.
4. Antifreeze fluid
(1) Relation between mixing ratio and freezing point
The freezing point of engine coolant changes with the
proportion of antifreeze fluid in water. To determine a
correct mixing ratio, you may refer to the curve shown in
Fig. 7-1-6.
(2) Calculation of mixing ratio
Mixing ratio=
Antifreeze fluid (L)
Antifreeze fluid (L)
﹢
water (L)
Attention:
The volume of antifreeze plus water is
10L (i.e. the total capacity of cooling system).
If total capacity of cooling system is 10L, the mixing
ratios listed in the following table are available.
Water outlet
rubber pipe
Overflow tank
Radiator
Water inlet
rubber pipe
Fan assembly
