Chery A11. Manual — part 24
CAC Gasoline Engine Maintenance And Servicing Manual
51
【14】 Engine cooling system
1) Description for cooling system
The cooling system is of pressure system. It
includes water pump driven by timing belt,
crosscurrent radiator, expansion tank, pressure
cap, thermostat and electric fan, fan shroud.
When engine coolant temperature is low,
water pump draws the coolant in the left water
room of radiator and pump it to the cylinder
block, cylinder head and intake manifold after
pressurizing, going from the local circulation
pipe of the thermostat seat to the warm air
heat exchanger, and then from heat exchanger
back to water pump inlet. The coolant back
from intake manifold joins the heat exchanger
and then backs to water pump inlet.
When engine coolant temperature reaches the
point for thermostat to open, the coolant for
cooling cylinder block, going through the
opened thermostat , combusting chamber and
behind the valve seat , will go into the right
water room of radiator from the drain pipe
of thermostat seat. For being cooled by
electric fan blowing ,the coolant is already
cooled When it reaches the left water
room,.
When engine works under normal working temperature, coolant will expand. so the relief valve in the
thermostat seat opens. The coolant enters the expansion tank from overflow tube. After the system is cooled,
the coolant comes back to the inlet of water pump from expansion tank.
The electric fan operation is controlled by thermo switch installed in the right water room of radiator.
When the contactpoint of thermo switch closes, the electric fan operates. Water temperature sensor is at the
back of the cylinder head at exhaust pipe side.
—cooling system parameters：
total system capacity (L)8
electric fan water pump
engine capacity(L)3.3
diameter. 280mm
diameter.
of
impeller
72mm
radiator capacity(L)2.1 blade quantity 6 speed ratio 1.053∶1
expansion tank capacity(L)0.4
operating voltage 9－16V pressure cap
RPM GradeⅠ 1500r/min
operating
pressure
160kPa
radiator
Grade Ⅱ 2800r/min
water temperature sensor
front face area 0.202 ㎡ thermo switch
radiation area 8.93 ㎡ operating temperature
GradeⅠ95 ℃
thermostat GradeⅡ102±3℃
opening temperature 85°－89° cut off temperature
GradeⅠ≤84℃
resistanceΩ
temperature℃
70
159±21.3
90
86.7±11
110
52.3±6.3
124
28.2±2.8
＋2
－3
hose
hose
warm wind heat
exchanger
hose
hose
pressure
cap
expansion
tank
hose
engine
temperature
regulator
carrier with temperature
regulator assembly
water
temperature
sensor
coolant
pipe
assembly
hose
assembly
hose
assembly
radiator
thermo
switch
electric fan
w
a
te
r p
u
m
p
in
le
t
Fig. 93
CAC Gasoline Engine Maintenance And Servicing Manual
52
wide opening temperature 89°－102° Grade Ⅱ≤91℃
Operating voltage 12V
CAC Gasoline Engine Maintenance And Servicing Manual
53
——Coolant draining ：
(1) remove pressure cap of expansion water tank
(2) connect a container under the radiator. Remove the outlet hose of radiator or open the drain plug of
radiator.
——Cleaning cooling system：
(1) drain the coolant and then close the drain plug of radiator or install the outlet hose of radiator
(2) add clean water into the max water level of expansion tank and install the pressure cap
(3) start engine and keep idling., warm engine to normal working temperature and stop engine cooling
down.
(4) drain water
(5) repeat step(2)—(4) until the water drained is the same as clean water.
(6) If the previous coolant application and replacement is not to specification, do some cleaning as the
following method:
a. drain coolant
b. remove outlet hose of radiator. Insert the water supply hose into the inlet of radiator until the water
drained is clean.
c. Connect the hose connected to water supply to the water outlet of thermostat seat to wash the engine
until the water drained from the water pump inlet is clean.
d. If radiator is too dirty, it may be washed from the reverse direction. Connect the hose connected to the
water supply to the water outlet of thermostat seat to wash the engine until the water coming out from
the water pump inlet is clean.
——Add coolant
(1)Before adding coolant, check if the drain plug of radiator is closed and if the pipeline is connected and
tight
(2)remove the pressure cap and add coolant by the filler of expansion tank slowly. Since the expansion
tank is in the highest point of cooling system, with the coolant level raising, the air in the system will
be discharged into the expansion tank. Adding coolant slowly may discharge the air.
(3) keep adding coolant until coolant level reaches the “maximum” line. install the filler cover to avoid
coolant splashing.
(4) Start engine and keep idling. Warm engine to normal working temperature. fan starts to run. Observe
the water thermometer and check if engine is overheated. If the coolant level of expansion tank drops
quickly, d add coolant to the “maximum” line to reduce the air circulation in the system.
(5) Stop engine to cool engine completely(one night if possible). remove pressure cap and check coolant
level ,fill coolant to the “maximum” line.
CAC Gasoline Engine Maintenance And Servicing Manual
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2) The removal and installation of water pump
assembly
——The structure of water pump assembly
1—water pump case
2—water pump impeller
3—water pump gear
4—water pump bearing
5—water pump seal (ceramics—black lead)
Removal：
——Loosen and remove four bolts from the
front end of cylinder block
——Remove water pump assembly
——Remove sealing gasket of water pump
Installation：
——Install new sealing gasket of water
pump on the water pump
——Install the water pump assembly inside
the cylinder block and screw in four
retaining bolt by hand, then tighten to
7.0—10.0Nm.
Note: The water pump assembly may not be
serviced. When water seal or bearing is
damaged, the water pump assembly should
be replaced
Fig. 94
Tighten torque
Sealing plate
Fig. 95
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