Operator`s manual
Fill the fresh water system as follows:
1.
Remove the pressure cap from the manifold.
2.
Pour a clean, fresh water coolant mixture into the manifold and allow enough time for the coolant
to
fill
the fresh water cooling system.
3.
Replace the pressure cap on the manifold.
4.
Remove the plastic cap from the coolant recovery tank and fill the tank with coolant halfway between the
ADD mark and the
MAX
mark. Replace the cap.
5.
Start and run the engine long enough for the engine
to
warm up so that the thermostat will open, allow-
ing the coolant
to
flow through the engine block and
to
the rest
of
the fresh water coolant system.
6.
Add coolant
to
the recovery tank, as required,
to
top
off the fresh water coolant system.
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 of the 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 exhaust 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
is
discharged from the cooling sys-
tem overboard
through
the
water-in-
jected wet exhaust system.
A zinc anode,
or
pencil, is located in the
sea water cooling circuit within the heat
exchanger. The purpose
of
the zinc
anode is
to
sacrifice itself
to
electrolysis
action taking place in the sea water cool-
ing 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.
New
Anode
27
~
~
Rep~ace
Rep~ace
Zinc Anode Conditions
C~ean
or
Replace