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4.3.24 Changing coolant and cleaning cooling system
In order to ensure the engine coolant to be good in cooling and anticorrosion, changing of coolant and cleaning of
cooling system are required every 80,000 km, 2,000 hours or 2 years, whichever comes first.
ŸWarning: At operating temperature, engine coolant is hot and under pressure, and the steam can cause
personal injury. Do not remover the pressure cap on the radiator until the engine has been stopped and
coolant temperature goes below 50
. Slowly unscrew the pressure cap to release pressure. The anti-rust
additive in the coolant contains alkali. Avoid skin and eye contact to prevent personal injury.
ŸWarning: Avoid skin or eyes contact with coolant to prevent personal injure.
(1) Stop the engine and wait until the temperature of coolant falls to below 50ć. Slowly unscrew the pressure cap to
release pressure and remove it. Loosen the drain cock on the radiator to completely drain the coolant in the radiator.
(3) Clean the cooling system according to the following steps.
(a) Install and screw up all the drain cocks and plug, and add the sodium carbonate solution (or the mixture of
sodium carbonate and water that is available in market) into the cooling system from the coolant filler.
Caution: Each 23 L of water should be mixed with 0.5 kg sodium carbonate. Do not use caustic cleaner, or
it will do harm to aluminum parts.
Purge the air in the coolant system while adding the cleaning fluid. Pour the cleaning fluid slowly to avoid
air block. The cleaning fluid should be added up to the bottom of the filler in the radiator and wait for about
3-5 minutes for a full purge of air.
(b) Start the engine and keep it running for 5 minutes after the cleaning fluid temperature goes up to above 80ć,
then stop the engine and completely drain the cleaning fluid in the cooling system.
Caution: During the whole cleaning process the pressure cap should not be on and the engine runs
without the cap on.
(c) Add clean water into the cooling system.
Caution: Pour clean water slowly to avoid air block. Clean water should be added up to the bottom of the
filler in the radiator and wait for about 3-5 minutes for a full purge of air.
Air inlet unloader valve
Carefully check unloader valve for carbon deposit. Clean
and remove deposit if it is serious. Check the air
compressor head, inlet and outlet for any problems and
replace them or relevant parts if necessary.
(2) Unscrew and remove the water drain plug on the
engine, and completely drain the coolant in the cooling
system.
Water drain plug
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