Installation manual
COOLING
SYSTEM
Refilling
the
Coolant
After closing the engine block drain, pour clean, premixed
coolant into the manifold and when the coolant
is
visible in
the manifold, start the engine and run it at slow idle.
Open
the air bleed petcocks
on
the manifold and the thermostat
housing.
Monitor the coolant
in
the manifold and add
as
needed. Fill
the
manifold
to
the filler neck and when the coolant flowing
from
the
petcock
is
free
of
air bubbles, close the petcock 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. When the petcock on the
thermostat housing
is
free
of
air bubbles, close that petcock.
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. . /
..---'
"\
/
~'
AIR
BLEED
~.,.
PETCOCK,
y--..
Q
.~,
_<\11'
~~~0:r~:1!~
"'\j
~\}~"
'.ij,j
//
~~/-
THERMOSTAT
I'
A thennostat, located near the manifold at the front
of
the
engine, controls the coolant temperature as the coolant
continuously flows through the closed cooling circuit.
When the engine
is
first started, the closed thermostat pre-
vents coolant from flowing (some coolant
is
by-passed
through a hole in the thermostat to prevent the exhaust
manifold from overheating). As the engine warms up, the
thermostat gradually opens. The thermostat
is
accessible
and can be checked, cleaned, or replaced easily. Carry a
spare thermostat 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.
THE
GASKET
IS
GROOVED
FITS
AROUND
THE
OUTER
EDGE
OF
THE
THERMOSTAT
CHANGING
THE
THERMOSTAT
TEMPERATURE
Engines & Generators
15