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COOLING SYSTEM
THERMOSTAT
A thennostat controls the coolant temperature as the coolant
continuously flows through the closed cooling circuit. When
the engine is fiflit started the closed thermostat prevents coolant
from flowing (some coolant is by-passed through the thermostat
to prevent the exhaust manifold from overheating). As the
engine warms up, the thermostat gradually opens. The
thennostat is accessible and can be checked, cleaned, or
replaced easily. Carry a spare thermostat and gasket.
GASKET
(APPLY SEALANT
TO BOTH SIDES)
TlERMOSTAT TEST
If you suspect a faulty thermostat, place it in a pan of water and
bring to a boil. A working thermostat should open about 112"
ZINC ANODE
Azine 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 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
REPLACE
CLEAN & REUSE
NOTE:
Electrolysis is the result of each particular installation
and
vessel location, not that of the generator.
If the zinc anode needs replacement, hold the hex boss into
which the zinc anode is threaded with a wrench while
loosening 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
damaged when removing the end cover. Replace the sealing
gasket (refer to your engine model's heat exchanger end
gasket part number), O-ring, cover, and install a new zinc
anode.
NOTE: The
threads of the zinc anodes are pipe threads and do
not require sealant. sealant should not be used as
it
may
insulate the zinc from the metal of the heat exchanger
housing preventing electrolysis action on the zinc.
RAW WATER DRAIN
HEAT EXCHANGER
COOLANT
__ " - _ DRAIN
ZINC ANODE
Cool raw water flows through the inner tubes of the heat
exchanger. As the engine coolant passes around these tubes,
the heat of the internal engine is conducted to the raw water
which is then pumped into the exhaust system and
discharged. The engine coolant (now cooled) flows back
through the engine and the circuit repeats itself.
The engine coolant and raw water are independent of each
other; this keeps the engine's water passages clean from the
harmful deposits found in raw water.
Heat Exchanger Service
After approximately 1000 hours of operation, remove, clean
and pressure test the engine's heat exchanger. (A local
automotive radiator shop should be able to clean and test the
heat exchanger.)
NOTE:
Operating in silty and/or tropical waters may require
that a heat exchanger cleaning be peiformed more often thall
every 1000 hours.
...v:
WESTERBEKE
Engines & Generators
13
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