TP-5964 7/01 13Section 3 Scheduled Maintenance
3.7 Cooling System
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.
WARNING
Checking the coolant level. Hot coolant can cause severe
injury or death. 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.
3.7.1 Coolant Level Check
Check the coolant level by removing the pressure cap.
Add fresh coolant until the level is just below the
overflow tube opening of the filler neck.
3.7.2 Cooling System Component
Inspection
To prevent generator shutdown or damage caused by
overheating:
D Keep the cooling air inlets clean and unobstructed.
D Inspect the radiator’s exterior for obstructions.
Remove dirt and foreign material using a soft brush or
cloth to avoid damaging the radiator fins.
D Check the hoses and connections for leaks. Replace
any cracked, frayed, or spongy hoses.
D Check the condition and tension of the radiator fan
and water pump belt(s). Follow the belt tension
procedure in this manual and/or the engine operation
manual.
D Check the pressure cap seal and replace a cracked or
deteriorated cap. Remove dirt and other debris from
the pressure cap and filler neck. The pressure cap
raises the boiling point of the c oolant, enabling higher
operating temperatures. Replace a leaking pressure
capwithoneratedforthesamepressure. The
pressure cap rating usually appears on the pressure
cap.
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Also check the surge tank’s pressure cap and replace a
cracked or deteriorated cap. The surge tank utilizes a
pressure cap to raise the boiling point of the coolant,
enabling higher operating temperatures. If the cap
leaks, replace it with same rating type of cap. Find the
pressure cap rating in Figure 3-9. Remove dirt and
other debris from the pressure caps and filler neck.
See Figure 3-8 for coolant capacity. Consult the coach
manufacturer for radiator cooling capacity. See
Figure 3-9 for thermostat and pressure cap ratings.
Model L(Qt.)
20EORZ 2.7 (2.85)
Figure 3-8 Coolant Capacity (Remote Radiator
Model)
Model 20EORZ
Pressure Cap Rating at Surge Tank, kPa (psi) 96.5 (14)
Thermostat Rating, _C(_F)
71 (160)
Figure 3-9 Thermostat and Pressure Cap Ratings
Note: Engine damage. Bleed the air from the cooling
system to prevent overheating and subsequent
engine damage.
Note: Block heater damage. The block heater will fail
if the energized heater element is not immersed
in coolant. Fill the cooling system before turning
on the block heater. Run the engine until it is
warm, and refill the radiator to purge the air from
the system before energizing the block heater.
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