Chapter 6 Cooling Water
System
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_________________________
3,4JH3(B)(C)E
1 . Cooling Water System
The cooling water system is
of
the indirect
sea
water
cooled, fresh water circulation type. The cylinders, cylin-
der heads and exhaust manifold are cooled with fresh
water,
and fresh water cooler (heat exchanger) use sea
water.
Sea water pumped in from the sea
by
the sea water
pump cools the tube
oil in the lube oil cooler and then
goes
to
the heat exchanger, where it cools the fresh
water. Then
it
ls sent to the mixing elbow and is dis-
charged
from the ship with the exhaust gas.
Fresh water is pumped
by
the fresh water pump from
the fresh water tank to the cylinder jacket to cool the
cylinders,and the cylinder head. The fresh water pump
Sea water circuit
Fresh
water
circuit
---+-
body also serves as a discharge passageway (line} at the
cylinder head outlet. and
is fitted with a thermostat.
The thermostat is
dosed
when the fresh water tempera-
ture is low, immediately after the engine is started and
during low load operation, etc. Then the fresh water flows
to the fresh water pump inlet, and is circulated insfde the
engine without passing through
the heat exchanger.
When the temperature
of the fresh water rises, the ther•
mostat opens, fresh water
flows to the heat exchanger,
and
it is then caoled by the sea water in the tubes as
it
flows through the cooling pine. The temperature of
the fresh water
is
thus kept within a constant range by the
thermostat.
--
Heal
exchanger
-
Printed in Japan
lIINSHl-118009
-
-
-
-
Fresh
water pump
t
Sea
water
pump
Kingston cock
t
Cyi,
head
Cyi.
Black
6-1
t
Lube.
oil
cooler
(
Only
on
)
4JH3{B)E
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