Crankcase Ventilation (Ccv) Heater Kit Gm78171-Kp1; (125/150Rezg Models); Cooling System; Coolant Level Check - Kohler 20-2250 kW Operation

Emissions certified models use a single electronic-
controlled pressure regulator (EPR) for both fuels. A tee
fitting connects both fuels together upstream of the
EPR. During operation when using the secondary fuel, it
is normal for a small amount of secondary fuel to seep
back through the primary fuel solenoid valve. To counter
this situation, one of two methods is used depending
upon the generator set model: (1) a second solenoid
valve (identical to the primary fuel solenoid valve) is
installed in a reverse configuration on the primary fuel
side or (2) a small vent line is installed between the
primary fuel inlet and the air intake through a fuel
solenoid valve.
3.6.5 Crankcase Ventilation (CCV)
Heater Kit GM78171-KP1

(125/150REZG models)

The crankcase ventilation (CCV) heater kit provides a
controlled heating source to the crankcase ventilation
system preventing freezing water buildup during cold
weather. The thermostat turns on at 4_C (40_F) and
turns off at 16_C (60_F) reducing energy consumption.
See Figure 3-7.
1
4
1. Heater element
2. Inline connector
3. Thermostat
4. AC power cord
Figure 3-7 Crankcase Ventilation Heater Kit

3.7 Cooling System

The cooling system maintenance information applies to
radiator-cooled models and city-water-cooled (heat
exchanger) models. The cooling systems function
similarly even though they use different components.
Radiator-cooled models have a radiator with a pressure
cap and coolant recovery tank.
models have a heat exchanger and an expansion/surge
tank with a pressure cap.
28 Section 3 Scheduled Maintenance
2
TT-1560
3
City-water-cooled
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.
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.
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.
3.7.1

Coolant Level Check

Check the coolant level in the coolant recovery tank, if
equipped. Maintain the coolant level between the high
and low marks.
Note: Periodically check the coolant level by removing
the pressure cap. Do not rely solely on the level in
the coolant recovery tank. 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 set 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.
TP-6161 1/12