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.
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