Power Unit Cooling System: 1F-1
Power Head
Power Unit Cooling System
General Description
Water Cooling System Description
Z9J0111601001
The cooling system uses a displacement type flexible vane impeller to supply cooling water to the powerhead
assembly.
To prevent incomplete combustion due to an overcooled engine, and to ensure proper water flow during cold engine
operation, there is a thermostat in the cylinder block.
Motor temperature and cooling system efficiency are monitored by cylinder temp. sensor and exhaust manifold temp.
sensor in the cylinder. If temperature higher than normal is detected by a sensor, an advance caution of overheat
condition is provided.
Displacement Type Water Pump Description
Z9J0111601002
In this displacement type water pump, the water pressure is increased by the change in volume between the impeller
and the pump case. As a result, the increased water pressure enables the water pump to circulate the cooling water.
Water Pressure Valve Description
Z9J0111601003
If cylinder water pressure is high when thermostat is closed, the valve will open to relieve the pressure.
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I9J011160003-01
1. Water inlet 3. Key 5. Water pump impeller 7. Driveshaft
2. Water outlet 4. Water pump case 6. Under panel
1. Water pressure valve cover 2. Water pressure valve
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I9J011160004-01
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