9. Cooling water system
162
9.3 Fresh water pump
9.3.1 Fresh water pump construction
The fresh water pump is of the centrifugal (volute) type, and circulates water from the fresh water tank to
the cylinder block and the cylinder head.
The fresh water pump consists of the pump body, impeller, pump shaft, bearing unit and mechanical
seal. The V-pulley on the end of the pump shaft is driven by a V-belt.
The bearing unit assembled in the pump shaft uses grease lubricated ball bearings and cannot be
disassembled.
9.3.2 Specifications of fresh water pump
Pump shaft speed
3860 ± 30 min
-1
Delivery capacity 66.7 L/min or more
Total head 4 m Aq
Cylinder head
Cylinder block
Gasket
Thermostat
Cover
Gasket
V-pulley
O-ring
(To cylinder block)
Fresh water pump
Spacer
Pulley seat
Water temperature
switch
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