System Test - DAELIM ET-250 Service Manual

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: 0.9-0.15 kgf/cm
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
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 center cover, and the n 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.
Ÿ Run the engine, and remove by-pass pipe.
Ÿ Check by-pass hole whether has the air bubble to emit.
Ÿ If emits without the air bubble, only has the coolant to
flow out, then backflow pipe joint on, engine flameout.
Ÿ Remove radiator filler cap.
Ÿ Starts the engine, inspects does not have the air bubble
in the radiator coolant, also the coolant liquid level is
stable.
Ÿ Stop the engine. Add coolant to proper level if
necessary.
Ÿ 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%
2
Reserve tank cap
2
.
Drain bolt
By-pass pipe
Pressure tester
Radiator filler cap
Filler cap