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Westerbeke 4.0Kw BCDB 50Hz Manual de instalación Pagina 21

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ENGINE
COOLING
CIRCUIT
RAW
WATER
COOLING
CIRCUIT
The raw water flow is created by a positive displacement
impeller pump. This pump draws water directly from the
ocean, lake,
or
river through a hose to the water strainer. The
raw water passes from the strainer through the heat
exchanger (through the heat exchanger tubes) where it cools
the engine circulating fresh water coolant.
The
raw water is
then discharged into the water injected exhaust elbow, mix-
ing with and cooling the exhaust
gass~s.
This mixture
of
exhaust gas and raw water is pushed overboard.
Raw
Water
Pump
The raw water pump is a self-priming, rotary pump with a
non-ferrous housing and a neoprene impeller. The impeller
has flexible vanes which wipe against a curved cam plate
within the impeller housing, producing the pumping action.
On no account should this pump be run dry as water acts as a
lubricant for the impeller. There should always be a spare
impeller and impeller cover gasket aboard (an impeller kit).
Raw water pump impeller failures occur when lubricant (raw
water) is not present during engine operation. Such failures
are not warrantable, and operators are cautioned to make sure
raw water flow is present at start-up.
NOTE:
Should a failure
~occur
with the
p~p:S
internal parts
(seals and bearings) it may be more cost efficient to purchase
a
new
pump
and rebuild the original pump as a spare.
Changing
the
Raw
Water
Pump
Impeller
Close the raw water intake valve. Remove the impeller with
the aid
of
two small screwdrivers, as illustrated, and carefully
pry the impeller out
of
the pump. Install the new impeller
and gasket by positioning the hub pin to align with the slot in
the drive shaft.
Mo~e
the blades to conform to the curved
cam plate and push the impeller into the pump's housing.
When assembling, apply a thin coating
of
lubricant to the
impeller and gasket. Open the raw water intake valve before
starting the engine.
NOTE:
If
any
of
the vanes have broken
off
the impeller they
must
be found to prevent blockage in the cooling circuit.
They often can be found in the heat exchanger.
,
RAW
WATER
PUMP
IMPELLER
GASKET
Heat
Exchanger
The heat exchanger is a copper tube which encloses a num-
ber
of
small copper tubes. Raw water is pumped through the
small copper tubes and the freshwater coolant from the
engine is circulated around the copper tubes. The raw water
removes heat from the freshwater coolant.
GASKET
Zinc
Anode
OUT
DEBRIS
=---RAWWATER
DRAIN
CLEAN
AND
BAD
REUSE
A zinc anode, or pencil,
is
located in the raw water cooling
circuit within the heat exchanger.
The
purpose
of
the zinc
anode is
to
sacrifice itself to electrolysis action taking place
in the raw water cooling circuit, thereby reducing the effects
of
electrolysis on other components
of
the system. The con-
dition
of
the zinc anode should
be
checked monthly and the
anode cleaned
or
replaced as required. Spare anodes should
be carried on board.
NOTE:
Electrolysis action is the result
of
each particular
installation and vessel location; not that
of
the generator.
If
the.zinc pencil needs replacement, hold the hex boss into
which the zinc pencil is threaded with a wrench while loos-
ening the anode with another wrench. This prevents the hex
boss from possibly tearing off the exchanger shell. After
removing the zinc, note the condition
of
it. If the zinc is
in
poor condition, there are probably a lot
of
zinc flakes within
the exchanger. Remove the end
of
the heat exchanger and
clean the inside
of
all zinc debris. Always have a spare heat
exchanger end gasket
in
case the present one becomes dam-
aged when removing the end cover. Replace the gasket (refer
to your engine model's heat exchanger end gasket part num-
ber), o-ring, cover, and install a new zinc pencil.
Heat
Exchanger
Service
After approximately 1000 hours
of
operation, remove, clean
and pressure test the engine's heat exchanger. (A local auto-
motive radiator shop should
be
able to clean and test the heat
exchanger. )
NOTE:
Operating in silty and/or tropical waters may require
tht;lt
a heat exchanger cleaning be performed more often than
every 1000 hours.
Engines
& Generators
15
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