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5.1 General
The generator set engine is water cooled. The closed
loop cooling system includes the engine water pump,
which circulates the cooling water, and the engine
thermostat which opens and closes the cooling water
flow to maintain a constant engine temperature.
Depending upon the installation requirements, the fan
may be a pusher type that blows air away from the
engine or a suction type that draws air toward the
engine.
5.2 Thermostat
See Figure 5-1 for the location of the engine thermostat.
See Figure 5-2 for the thermostat rating.
1
2
Top View
1. Thermostat
2. Exhaust outlet
Figure 5-1 Thermostat Location
Thermostat Rating
All Models
Figure 5-2 Thermostat Rating
Hot water from the engine is cooled in a radiator and
then returned to the water pump for recirculation in the
cooling passages of the engine. Depending upon the
generator set model, the radiator may be mounted
in-line (on the front of the engine) or at a remote location
by the coach manufacturer. For a cooling system with a
remote radiator, the radiator and its mounting provisions
on the engine are replaced by a belt guard. Hoses then
connect the water pump and thermostat ports to the
remote radiator. Either system may include an optional
overflow tank connected to the overflow tube from the
radiator.
TP-6359 7/08
1
82_C (179_F)
Section 5 Cooling System
WARNING
Hot coolant and steam.
Can cause severe injury or death.
Before removing the pressure cap,
stop the generator set and allow it to
cool. Then loosen the pressure cap
to relieve pressure.
Note: Allow the engine to cool. Release pressure from
the cooling system before removing the pressure
cap. To release pressure, cover the pressure cap
with a thick cloth and then slowly turn the cap
counterclockwise to the first stop. Remove the
cap after pressure has been completely released
and the engine has cooled. Check the coolant
level at the tank if the generator set has a coolant
recovery tank.
Section 5 Cooling System
25
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