1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 208Get this manual
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 thermostatThis system cools both the power unit and exhaust and is shown in schematic from belowIf overheating occurs, the components of the cooling system must be inspected for blockage, corrosion buildup or component damageComponent inspection Refer to page Water pumpImpeller 9-9 Water tube 7-5 Thermostat 6-64 Water pressure valve 7-5 Cylinder head 6-26 Cylinder block 6-43