Operation; Water Cooling System - Suzuki DF 90 Service Manual

6-64 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
Water pump / Impeller........................... 9-11
Water tube ............................................. 7-6
Thermostat ............................................ 6-63
Water pressure valve ............................ 7-20
Cylinder head ........................................ 6-26
Cylinder block ....................................... 6-43
ENGINE HOLDER
OIL PAN
DRIVESHAFT
HOUSING
PROPELLER
EXHAUST OUTLET
Refer to page
RETURN HOSE
When open
THERMOSTAT
CYLINDER HEAD CYLINDER
EXHAUST
WATER JACKET
ENGINE HOLDER
WATER TUBE
WATER PUMP
WATER INTAKE
WATER
FUEL RETURN
PIPE
OIL PAN
CRANK CASE
INTAKE
MANIFOLD
PILOT
WATER HOLE
PRESSURE
VALVE