Table of Contents
Advertisement
···CootINGSYS-TEM
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
circulating pump, absorbing heat from Ihe engine. The
coolant Ihen passes through the thermostat into the manifold,
to the heat exchanger where it is cooled, and returned to the
enginl' block via the suction side of the circulating pump.
When the engine is started cold, external coolant flow is
prevented by the closed thermostat (allhough 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 umestricted to the external portion of the
cooling system.
KEEP THE
TO COOLANT
RECOVERY TANK
COOLANT PASSAGE
FROM COOLANT
RECOVERY TANK
PRESSURE
yCAP
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. Cony a spare
cap. Check also to ensure the
coolant passage is clear so
coolant within.
the, system
is
able to expand and contract
to andfron'/. the coolant
reCaVel)1
tank.
Coolant Recovery Tank
The coolant recovery
tank
allows for the expansion and con-
traction of the engines coolant dnring engine operation Witll-
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: Tltis tank, with its slWI1 run of plastic hose, is best
located at or above the level of the engine
~
manifold.
CHANGING COOLANT
The engine's coolant must be changed according to the
MAINTENANCE SCHEDUlE. If Ihe 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 bilCk 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 draio and start
the refill process.
NOTE: Tlte drain petcock on the heat exchanger should also
be used to
drain engine coolant.
COil LAliT DRAIN
.' /"LLI'"
HD PLUG 6MM
Refilling the Coolant
c\
. After
replacing the engine block drain
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 Inix to halfway between LOW and MAXand replace
the cap. Run the engine and observe the coolant expansion
flow into the ricovery
tarik.
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
Ihrn
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 obstruction and the
air
intake hose should
periodically be inspected to be sure it is also free from
obstruction.
A
CAUTION:
Never perform air intake maintenance
with the generator running.
Engines & Generators
14
Advertisement
Table of Contents
Troubleshooting
