Installation manual
FROM
TANK
ENGINE
COOLING
CIRCUIT
Refilling
the
Coolant
After replacing the manifold drain plug, run thc
engine
at
idle and slowly pour clean,
premixed
coolant
into the mani-
fold.
NOTE:
When a steady flow
of
coolant appears at the heat
exchanger drain plug opening, close
the drain
plug
and fill
the system until the manifold remains full.
Monitor the coolant
in
the manifold and add as needed. Fill
the manifold to the filler neck
and
install the manifold pres-
sure 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.
COOLANT
RETRACTION
TO
COOLANT
RECOVERY
TANK
tNSPECT
AND
CLEAN
THE
COOLANT
RECOVERY
TANK
AND
tTS
CONNECTING
HOSE
EVERY
3
MONTHS
j)----
MANtFOlD
PRESSURE
CAP
COOLANT
EXPANSION
NOTE:
Periodically check the condition
of
the manifold pres-
sure cap. Ensure that the upper and lower rubber seals are in
good condition and check that the vacuum valve opens
alld
closes tightly. Carry a spare cap.
THERMOSTAT
A thermostat, located near the manifold
at
the front
of
the
engine, controls the coolant temperature, as
it
continuously
flows through the closed cooling circuit.
When
the engine
is
first started the closed thermostat prevents coolant from
flowing (some coolant
is
by-passed through a hole
in
the
thennostat to prevent the exhaust manifold from overheat-
ing); as the engine
wanns
up the thermostat gradually opens.
The thermostat
is
accessible and can be checked, cleaned,
or
replaced easily. Carry a spare thennostat and gasket.
Replacing
the
Thermostat
Remove the cap screws and disassemble the thermostat hous-
ing as shown. When installing the new thermostat and gasket
apply a thin coat
of
sealant on both sides
of
the gasket before
pressing
it
into place. Do not over-tighten the cap screws.
Run the engine and check for normal temperatures and that
there are no leaks
at
the thermostat housing.
TEMPERATUR
SENDER
GASKET-
CAP
SCREW
RAW
WATER
COOLING
CIRCUIT
/
AIR
BLEED
PETCOCK
V"'----COOlANT
TEMPERATURE
SWITCH
THERMOSTAT
The raw water flow
is
created by a positive displacement
impeller pump. This pump draws water directly from the
ocean, lake,
or
river through a hose
to
the water strainer. The
raw water passes from the strainer through the heat
exchanger (through the heat exchanger tubes) where
it
cools
the engine circulating fresh water coolant. The raw water
is
then discharged into the water injected exhaust elbow, mix-
ing with and cooling the exhaust gasses. This mixture
of
exhaust
gas
and raw water is discharged overboard.
Raw
Water
Pump
The raw water pump
is
a self-priming, rotary pump with a
non-ferrous housing and a neoprene impeller. The impeller
has flexible vanes which wipe against a curved cam plate
within the impeller housing, producing the pumping action.
On no account should this pump be run dry, as water acts as
a lubricant for the impeller. There should always be a spare
impeller and impeller cover gasket aboard (an impeller kit).
Raw water
pump
impeller failures occur when lubricant (raw
water)
is
not present during engine operation. Such failures
are not warrantable, and operators are cautioned to make sure
raw water flow is present at start-up.
NOTE:
Should a failure occur with the pump s illlernal parts
(seals alld bearings) it may be more cost efficient to purchase
a new
pump
and rebuild the original pump as a spare.
-.yo
WESTERBEKE
Engines & Generators
14