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COOLING SYSTEM
FIIESH WATER COOLING CIRCUIT
NOTE:
Refer to the ENGINE COOlANT section for the rec·
ommended ontifreeze
and
water mixture to be used as the
fresh water coolont.
Fresh water coolant is pumped through the engine by a
circulating pump, absorbing heat from the engine. The
coolant then passes through the thermostat into the manifold,
to the heat exchanger where it is cooled, and returned to the
engine block via the suction side of the circulating pump.
When the engine is started cold, external coolant flow is
prevented by the closed thermostat (although some coolant
flow is bypassed around l11e thermostat to prevent the exhaust
manifold from overheating). As the engine warms up, the
thermostat gradually opens, allowing full flow of the engine's
coolant to flow unrestricted to the external portion of the
cooling system.
TO COOLANT
RECOVERY TANK
FROM COOLANT
RECOVERY TANK
PRESSURE
/CAP
COOLANTRETRACnON
NOTE:
Periodically check the condition of the manifold
pressure cap. Ensure the upper and lower rubber seals are ill
good condition. Check to ensure
the vacuum valve opens and
closes tightly. CaYlya spare
cap. Check also to. ensure the
coolant passage is clear so
coolant within the system. is
able to expand and contract
to andfrom the coolant recovelY tank.
Coolant Recoverv Tank
SEAL
The coolant recovery
tank
allows for the expansion and con-
traction of the engines coolant during engine operation with-
out introducing
air
into the system. This recovery
tank
is
provided with fresh water cooled models and with the fresh
water coolant conversion kit and must be installed before
operating the engine.
NOTE:
This tallk, with its short
rUII
of plastic hose, is best
located at or above the level of the engille's mallifold.
CHANGING COOLANT
The engine's coolant must be changed according to the
MAINTENANCE SCHEDUIE. If the coolant is allowed to
become contaminated, it can lead
to
overheating problems.
A
CAUTION:
Proper cooling system maintenance is
critical;
a
substantial number of engine failures can be
traced back to cooling system corrosion.
Drain the engine coolant by removing the drain plug-on the
engine block and opening the manifold pressure cap. Flush
the system with fresh water, then reinstall the drain and start
the refill process.
NOTE:
The draill petcock
011
the heat exciumger shouldalsQ
be used to
drain engine coola11.t. .
COOLANT DRAIN
<11' /-
M.,.O"
HD PLUG 6MM
R~filling
the Coolant
c\
After
replacing the engine block drain plug; close
heat
exchanger's coolant petcock. Then run the engine at idle and
slowly pour clean, premixed coolant into the manifold.
Monitor the coolant in the manifold and add as needed. Fill
the manifold to the filler neck and install the manifold
pressure cap.
Remove the cap on the coolant recovery
tank
and fill with
coolant mix to halfway between LOW and MAXand replace
the cap. Run the engine and observe the coolant expansion
flow into the recovery
tank.
.
After checking for leaks, stop the engine and allow it
to
cool.
Coolant should draw back into the cooling system as the
engine cools down. Add coolant to the recovery
tank
if
needed and check the coolant in the manifold. Clean up any
spilled coolant.
.
AIR INTAKE/COOLING
Clean
air
is drawn into the engine
thru
the
air
intake at the
top side of the generators backend. The
air
serves two
functions: it cools the electronics in the control box and
provides clean fresh
air
for engine combustion.
The generators
air
intake must have "breathing space" and
be clear from abstraction and the
air
intake hose should
periodically be inspected to be sure it is also free from
abstraction. .
. . " . "
A
CAUTION:
Never pedorm air intake maintenance
with the generator running.
~WESTERBEKE
Engines & Genera ors
14
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