2003+ Suzuki DF9.9/DF15 four stroke outboard motors service manual, Page 142Get this manual
POWER UNIT
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 belowIf overheating occurs, the components of the cooling system must be inspected for blockage, corrosion build-up or damageRefer to page Component inspection Water pumpImpeller8-10 Water tube 7-9 Thermostat 6-37 Cylinder head 6-10 Cylinder block 6-27 COOLING SYSTEM SCHEMATIC