Aeon 350cc, Service Manual

Page: 51 / 192

ENGINE
4-51
RADIATOR CHECK
1. Check radiator fins for obstruction any time, clean
obstruction.
2. Straighten any flattened fins with a thin, flathead
screwdriver.
3. Verify the connect radiator hoses for signs of wear,
deterioration damaged or leakage. Replace if necessary.
4. Check radiator fan motor for electric function. Repair or
replace if necessary.
5. Measure radiator cap opening pressure. The pressure cap
relief pressure is 0.9 Bar (13 psi). Make sure pressure maintain
for ten seconds and there is no drop in pressure. Replace cap if
it does not meet this specification.
Cooling System Pressure Test
1. Remove battery inspection cover.
2. Remove pressure cap and determine the cooling system
pressure by using a commercially available pressure tester.
3. The system must keep the 0.7 Bar (10 psi) for five minutes
or longer.
If pressure loss is evident within five minutes, check the
radiator, hoses or clamps and water pump seals for leakage.
THERMOSTAT CHECKING
NOTE: A faulty thermostat could cause engine
serious overheating or overcooling.
1. Suspend the thermostat in a container filled with water.
2. Slowly heat the water.
3. Place a thermometer into the water.
4. While stirring the water, observe the thermostat and
thermometer’s indicated temperature.
The thermostat should start open at 65°C and full
pen at 80°C.
FAN THERMO SWITCH
1. Connect the fan thermo switch harness with multi-meter
2. Place a thermo switch into the water.
3. Ensure switch connect at 80
°
C (fan start) and disconnect at
70 ° C (fan stop).
4. Replace thermo switch if it doesn’t meet with specification.