POWER UNIT 6-39
OPERATION
WATER COOLING SYSTEM
The water cooling system consists of the water pump (in the lower unit), the water tube (between the lower
unit and the power unit) and the thermostat (in the cylinder). This system cools both the power unit and the
exhaust and is shown in schematic form below.
If overheating occurs, the components of the cooling system must be inspected for blockage, corrosion
build-up or damage.
Component inspection
Refer to page
Water pump/Impeller........................................................... 8-8
Water tube........................................................................... 7-6
Thermostat .......................................................................... 6-38
Cylinder head ...................................................................... 6-11
Cylinder block...................................................................... 6-23
COOLING SYSTEM SCHEMATIC
When open
Driveshaft housing
Exhaust outlet
Thermostat
Exhaust water
jacket
Cylinder
Cylinder head
Driveshaft
housing
Water tube
Water pump
Water intake
[WATER]
Exhaust
release hole
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