Yanmar 3JH3E - 3. Fresh Water Pump; 3-1 Fresh water pump construction

Chapter 6 Cooling fVater Systt'm
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3. Fresh Water Pump
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
cylinders and cylinder head.
The fresh
water pump consists of the pump body, im-
peller, pump shaft, bearing unit and mechanical seal.
The V pulley on the end of the pump shalt is driven by a V
belt from the crankshaft.
The bearing unit assembled
in the pump shaft uses grease
Thermostat
Cylinder head
Printed in Jap:m
HINSHl-1180-09
6-5
lubricated ball bearings and cannot be d:isassembted.
The totally enclosed mechanical seal spring presses the
fmpe!!er seal mounted on the impeller side away from the
pump body side. This prevenis water from leaking along
the
pump shaft
As the impeller and pulley flanges are press fit assembled,
they cannot
be disassembled,
V-pulfey