Fresh Water Cooling Circuit; Changing The Coolant - Westerbeke 29.0 EGED 60Hz Operator's Manual

COOLING SYSTEM
FRESH WATER COOLING CIRCUIT
NOTE:
Refer to the ENGINE COOLANT section for the rec-
ommended antifreeze and water mixture to be used as the
fresh water coolant.
Fresh water coolant is pumped through the engine by a circu-
lating 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 pre-
vented by the closed thermostat (although some coolant flow
is bypassed around the 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
KEEP THE
COOLANT PASSAGE
CLEAR
FROM COOLANT-
RECOVERY TANK
COOLANT EXPANSION
PRESSURE
/CAP
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. Cany a spare
cap. Check also to ensure the
coolant passage is clear so
coolant within. the,system is
able to expand and contract
SEAL
to and from the coolant recove1y tank..
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 9e located at or
~hove
the
engine manifold level and should be ea.Sily accessible.
NOTE:
11zis tank, with its short run of plastic hose, is best
located at or above tlze 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 cooling system maintenance is
critical; a substantial number of engine failures can be
traced back to cooling system corrosion.
Drain the engine coolant by loosening the drain plug on the
engine block and opening the manifold pressure cap. Flush
the system with fresh water, then start
th~
refill process.
NOTE:
The drain on the heat exchanger should also be us(td
to help drain engine coolant.
OIL GALLERY
Refilling the Coolant
After closing the engine block drain, pour clean, premixed
antifreeze coolant into the open filler neck. When coolant is
visible in the filler neck, start the engine. Open the air bleed
petcocks when present on the thermostat housing and heat
exchanger.
Monitor the coolant in the filler neck and add as needed to
keep it filled. Monitor the air bleed petcocks and when clear
coolant is flowing from them close each. Top off the filler
neck with coolant and install the 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. Clean up any spilled coolant.
A
WARNING:
Beware of the hot engine coolant.
Wear protective gloves.
Engines
&
Generators
14