POWER UNIT 7-61
OPERATION
WATER COOLING SYSTEM
The water cooling system includes the lower unit water pump, lower unit to power unit water supply tube, oil
pan water pressure valve, power unit water passages and thermostat.
This system cools both the power unit and exhaust and is shown in schematic from below.
If overheating occurs, the components of the cooling system must be inspected for blockage, corrosion buidup
or component damage.
Component inspection Refer to page
Water pump / Impeller.................................... 10-10
Water tube........................................................ 8-13
Thermostat ....................................................... 7-60
Water pressure valve ....................................... 8-13
Cylinder head................................................... 7-22
Cylinder block .................................................. 7-40
CYLINDER
BLOCK
THERMOSTAT
WATER PUMP
PILOT DISCHARGE
CYLINDER HEAD
WATER PRESSURE
VALVE
DRIVESHAFT
HOUSING
WATER FILTER
WATER
MAIN EXHAUST
PASSAGE
When open
WATER INTAKE
SUB-WATER
INTAKE
PROPELLER
EXHAUST OUTLET
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