completed
with
temperature gaueg connectors or temperature sensor connectors.
For the cooling system
of
the marine diesel engine, the radiator and fan are replaced
by
sea
water
and fresh water heat exchanger. The water route includes
two
parts:
One route
is
the sea water inleted
by
the
sea
water
p.ump
enter into
ihe
exchanger
to
cool the fresh
water,
then enter the exhaust manifold water jacket
to
cool the ex-
haust manifold. The other route is the fresh water
in
the inflation compensating wa-
ter
tank enter into the water pump through the exchanger, then enter into the en-
gine block, oil cooler, cylinder head and the thermostat, then return
to
the
inflation
compensating water tank. This
is
a fresh water cycle
of
the marine diesel engine.
10.1 Water pump
The diesel engine adopts centrifugal
water
pump which is installed at the front
of
the
engine block and driven by the crankshaft belt wheel through the V belt.
The
water
pump bearing is supported by the
two
dustproof bearing
in
the shell and
rotates in the water pump. The vane wheel is installed at the end
of
the
water
pump
bearing.
There-s china ring on the vane wheel neck, and between
it
and the pump
shell there
~
water seal subassembly used
to
avoid water from leaking out
of
the
pump block. To avoid the water leak into the rotating bearing, a
water
- relief hole is
drilled under the seat hole
of
the pump bearing and a water
throw
ring is installed on
the bearing
to
make the water leaked into the seal hole
of
the bearing spill over from
the
water
- relief hole. If find the water - relief hole dripping
water
seriously, you
should change the water seal.
Radiator connector can
be added on the water pump shell and the cylinder head
to
supply heating for customers.
10.2
Fan
The diesel engine adopts vane
axial
-
flow
cooling fan which is installed
at
the
front
of the
water
pump belt wheel and rotates synchronously
with
the pump bearing.
According
to
the different application of the diesel engine
and
the surrounding tem-
perature and
wind
quantityt the fan can be chosen
as
four or six leaf blades, wind
absorbing or wind ejecting
type.
10.3
Thermostat
The diesel engine adopts paraffin
wax
type thermostat.
The
thermostat is installed
in
the thermostat shell at the position
of
water
outlet
mouth which
is
in
front
of
or beside the cylinder head. 'It is used
to
control the quan-
tity
of
cooling water,flowed into the radiator, adjust the temperature
of
the
cooling
Vv"ater
and
~eep
the
engine
'wYorking
in
a
proper
tQr"I'\pArature
ml'lst
time.
The starting temperature
of·the
thermostat main valve is
77
:t2OC, while
the
fully
0-
pening temperature is
87
±
2OC,
and
the
raising travel
of
the: valve
for
fully· opening
should not be less than 9mm.
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