Operation; Water Cooling System - Suzuki DF 25 Service Manual

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
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
THERMOSTAT
CYLINDER HEAD
PILOT DISCHARGE
Refer to page
When open
CYLINDER
BLOCK
MAIN EXHAUST
PASSAGE
WATER PUMP
WATER FILTER
WATER INTAKE
SUB-WATER
INTAKE
WATER
POWER UNIT 7-61
WATER PRESSURE
VALVE
DRIVESHAFT
HOUSING
PROPELLER
EXHAUST OUTLET