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Westerbeke WPDS-20 Betreibershandbuch Seite 45

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Seitenansicht 44
Thermostat
Generally, thermostats are of two types. One
is
simply a choking device which opens and closes
as
the
engine's temperature rises and
falls. The second type has a bypass mechanism. Usually this
is
a disc on
the bottom
olthe
thermostat which moves downward
to
close off
an
internal bypass passage within the head.
Since 1980, each type
of
thermostat has a hole punched through
it.
The hole is a bypass
to
prevent the ex-
haust manifold from overheating during the engine's warm-up. Replacement thermostats must have this
design characteristic.
Sea Water
Circuit
The sea water flow
is
created
by
a gear-driven, positive displacement, neoprene impeller pump. The pump
draws sea water directly from the ocean through the sea cock and sea water strainer and passes the water
to
the heat exchanger's sea water inlet. The sea water passes through the heat exchanger's tubes, from
which heat from the fresh water system is absorbed, and then the sea water is discharged from the cooling
system overboard through the water-injected wet exhaust system.
A zinc anode,
or
pencil, is located in the sea
water cooling circuit within the heat ex-
changer. The purpose
of
the zinc anode is
to
sacrifice itself
to
electrolysis action
taking place in the sea water cooling circuit,
thereby reducing the effects of electrolysis
on other components of the system. The
condition
of
the zinc anode should be
checked monthly and the anode cleaned
or
replaced as required. Spare anodes
should be carried on board. Be sure
to
clean zinc debris from the area inside
of
the
heat exchanger where the zinc anode
is
positioned.
Sea Water
Pump
~
..
,
,.
NEW
AHODE
REPLACE REPLACE
Zinc Anode Conditions
CLEAN
OR
REPLACE
The sea water
pump
is
a self-priming, gear-driven 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. There should always be a spare
impeller and impeller cover gasket aboard (an impeller kit). Sea water failures occur when lubricant
(sea
water)
Is
not present. Such failures are not warrantable and the operator's are cautioned
to
ensure that sea
water flow
is
present at start-up.
45
Westerbeke Diesel Engines
Seitenansicht 44
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