12. COOLING SYSTEM
12-5
System Test
Test on the filler cap
Hermetically seal the filler cap, apply water and
pressure to the filler cap. Replace it with new one
if found failing to maintain the specified pressure
within a given time limit, or the opening pressure is
too high or too low. The specified pressure shall
be maintained at least for 6 seconds in the test
Relief pressure for the filler cap: 0.75-1.05
kg/cm
2
Apply pressure to the radiator, engine and water
hose to check for any leakage
Caution
Pressure which is too high may damage the
radiator. Never use pressure which exceeds
1.05 kg/cm
2
.
If the system fails to maintain the specified
pressure for at least 6 seconds, repair or replace
parts.
Change of coolant
Warning
Never attempt to carry out service work on the
cooling system unless the engine is completely
cooled down, otherwise, you may get scalded.
Remove the front cover, and then remove filler
cap.
Place a water pan under the water pump, loosen
the drain bolt to drain out the coolant.
Reinstall the drain bolt.
Refilling system with coolant and bleeding the air
bubbles.
y Run the engine, and remove by-pass pipe.
y Check by-pass hole whether has the air bubble
to emit.
y If emits without the air bubble, only has the
coolant to flow out, then backflow pipe joint on,
engine flameout.
y Remove radiator filler cap.
y Starts the engine, inspects does not have the air
bubble in the radiator coolant, also the coolant
liquid level is stable.
y Stop the engine. Add coolant to proper level if
necessary.
y Screw and tighten up the radiator filler cap.
Caution
In order to avoid the water tank rusting, please do
not use the unclear trade mark refrigerant.
Coolant recommended: SYM Bramax radiator
agent.
Concentration: 50%
By-pass pipe
Filler cap
Pressure tester
Radiator cap
Drain bolt
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