Suzuki DF 40 - Operation; Water Cooling System

6-65 POWER UNIT
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 build-
up or component damage.
Component inspection Refer to page
Water pump / Impeller........................... 9-9
Water tube.............................................7-5
Thermostat............................................6-64
Water pressure valve ............................7-5
Cylinder head........................................ 6-26
Cylinder block ....................................... 6-43
ENGINE HOLDER
OIL PUMP CASE
CYLINDER
THERMOSTAT
OIL PAN
OIL PAN
WATER TUBE
ENGINE HOLDER
PROPELLER
EXHAUST OUTLET
DRIVESHAFT
HOUSING
CYLINDER HEAD
EXHAUST
WATER JACKET
VAPOR
SEPARATOR
SUB-WATER
INTAKE
PRESSURE
VALVE
PILOT
WATER HOLE
WATER PUMP
When open
WATER INTAKE
WATER