Cooling System; Fresh Water Cooling Circuit; Changing The Coolant - Westerbeke 5.0KW BCD Operator's Manual

COOLING SYSTEM
F1RESH
WATER COOLING
CIRCUIT
NOTE:
Refer to the ENGINE COOLANT section for the rec-
o:mmended antifreeze and water mixture to be used as the
flesh water coolant.
Fresh water coolant is pumped through the engine by a
circulating pump, absorbing heat from the engine. The
coolant then passes through the thennostat into the manifold,
t6 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 the thennostat 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
c:ooling system.
KEEP THE
TO COOLANT
F1EGOVERY TANK
COOLANT PASSAGE
CLEAR
FROM COOLANT
RECOVERY TANK
COOLANT EXPANSION
~
\I
PRESSURE
yeAP
COOLANT RETRACTION
NOTE:
Periodically check the condition of the manifold
pressure cap. Ensure the upper and lower rubber seals are in
good condition. Check to ensure
the vacuum valve opens and
closes tightly. Carry a 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 recovery tank.
Coolant Recovery Tank
The coolant recovery tank allows for the expansion and con-
traction of the engines coolant duqng 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 tank, with its short run of plastic hose, is best
located at or above the level of the engine's manifold.
CHANGING COOLANT
The engine's coolant must be changed according to the
MAINTENANCE SCHEDULE. If the coolant is allowed to
become contaminated, it can lead to overheating problems.
A
CAUTION:
Proper coaling system maintenance is
critical;
a
substantial number of engine failures can be
traced back to cooling system co"osion.
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 drain petcock on the heat exchanger should also
be used to help drain engine coolant.
A
WARNING:
Beware of the hot engine coo/ant.
Wear protective gloves.
Refilling the Coolant
After replacing the engine block
drain
plug, close the 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 MAX and 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.
Engines
~ ~enerators
15