Specifications

20
CHANGING COOLANT
Refer to Table 3 for scheduled maintenance. The
engine cooling system is filled with a 50/50 mixture
of ethylene glycol anti-freeze and water when the
genset leaves the factory, which is suitable for tem-
peratures down to -34
° F (-37° C).
Replace the coolant every two years. Use ethylene
or propylene glycol anti-freeze solution that con-
tains a rust and corrosion inhibitor. The anti-freeze
should not contain a stop-leak additive.
The water used for engine coolant should be clean,
low in minerals, and free of corrosive chemicals.
Use distilled water if available. The cooling system
has a 4.2 quart (4 l) capacity.
Pressure Cap
Replace the pressure cap (Figure 10) every two
years because its seals can deteriorate and begin to
leak. Proper cooling system pressure (14 psi) is es-
sential for optimal engine cooling and minimal cool-
ant loss.
Draining the Cooling System
WARNING
Hot coolant spray can cause severe
burns. Let the engine cool before releasing the
pressure cap or removing the drain cap.
Allow the engine to cool before removing the pres-
sure cap. Then relieve any remaining pressure by
turning the pressure cap slowly, without pushing
down on it, until it catches. When the pressure has
been relieved, remove the pressure cap by pushing
down and turning it until it can be withdrawn. Then
get a suitable container and drain the coolant by re-
moving the system drain cap (Figure 10).
WARNING
Ethylene glycol antifreeze is con-
sidered toxic. Dispose of it according to local
regulations for hazardous substances.
It is recommended that the system be cleaned and
flushed before refilling. Radiator cleaning chemicals
are available at local auto parts stores. Follow the
instructions for cleaning and flushing that come with
the cleaning solution.
Refilling the Cooling System
Fill the recovery tank with coolant mixture to the
COLD mark.
Secure the system drain cap. Fill the cooling system
with coolant mixture through the pressure cap/fill
opening. Pull the hose connected to the pressure
cap assembly out as far as it will go. When coolant
fills up to the fill opening, start and operate the gen-
set for a few minutes and shut it down. (It is recom-
mended that the air conditioners or other large loads
be turned on so that the genset will operate under
load, causing the engine to run faster and expel
trapped air.) Add more coolant if necessary and se-
cure the pressure cap.
Coolant Level Check
Check coolant level in the recovery tank (Figure 10)
before the first startup of each day and fill to the
COLD mark if necessary.