Crankcase Ventilation (Ccv) Heater Kit Gm78171-Kp1; Cooling System; Coolant Level Check; Cooling System Component Inspection - Kohler Decision-Maker 3000 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 valve. To counter this
situation, one of two methods is used depending upon
the generator set model: (1) a second valve (identical to
the primary fuel 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 solenoid valve.
3.7 Crankcase Ventilation (CCV)
Heater Kit GM78171-KP1
Applies to 125/150REZG_ (GM Powered) generator set
models. Consult your
distributor/dealer for additional information.
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 3-5.
1
4
1. Heater element
2. Inline connector
Figure 3-5 Crankcase Ventilation Heater Kit

3.8 Cooling System

The cooling system maintenance information applies to
radiator-cooled models which have a radiator with a
pressure cap and coolant recovery tank.
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.
TP-6694 7/11
local generator set
2
3
TT-1560
3. Thermostat
4. AC power cord
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.
3.8.1

Coolant Level Check

Check the coolant level in the coolant recovery tank.
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.
3.8.2 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.
D
Check the condition and tension of the radiator fan
and water pump belt(s).
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 coolant, enabling higher
operating temperatures. Replace a leaking pressure
cap with one rated for the same pressure.
pressure cap rating usually appears on the pressure
cap.
Section 3 Scheduled Maintenance
Follow the belt tension
The
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