Cooling System; Changing Coolant - Westerbeke 8.0 KW-60Hz SBEG Operator's Manual

COOLING SYSTEM
FRESH WATER COOLING CIRCUIT
NOTE:
Refer to the ENGINE COOIANT section for the
recommended antifreeze and water mixture to be used as the
. fresh water coolant.
Fresh water coolant is pumped through the engine by a
circulating pump, absOIbing heat from the engine. The
coolant then passes through the thermostat into 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 thermostat to prevent the exhaust
manifold from overheating). As the engine "'arms up, the
thermostat gradually opens, allowing full flow of the engine's
coolant to flow unrestricted to the external pOItion of the
cooling system.
Coolant Recovery Tank
A coolant recovery tank allows for engine coolant expansion
and contraction during engine operation, without any signifi-
cant loss of coolant and without introducing air into the cool-
ing system. This tank should be located at or above the
engine manifold level and should be easily accessible.
COOLANT
TANK
NOTE:
Periodically check the condition of the manifold pres-
sure cap. Ensure that the upper alld lower rubber seals are in
good coTutition and check that the vacuwn valve .opens and
closes tightly. Carry a spare cap.
SEAL
MANIFOLO
PRESSURE
CAP
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 cooling system maintenance is
critical; a substantial number of engine fai/ures 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 drain petcock on the heat exchanger should also
be used to help drain engine coolant.
A
WARNING:
Beware of the hot engine coolant.
Wear protective gloves.
Refilling the Coolant
After replacing the engine block drain plug, close the heat
exchanger's coolant petcock. Slowly pour clean, premixed
antifreeze coolant into the water jacketed exhaust manifold
filler neck opening. Fill the system full, then start the engine.
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.
KEEP THESE PASSAGES CLEAR TO ENSURE
COOLANT EXPANSION A FULL FLOW OF COOLANT TO ANO FROM
THE COOLANT RECOVERY TANK ( A PIPE
CLEANER WORKS WELL)
-.y-
WESTERBEKE
Engines
&
Generators
13