Cooling System Servicing; Clean Radiator Fins/Inspect Hoses; Change Coolant; Check Coolant Level - Kohler 15CCO Service Manual

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.
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.

Clean Radiator Fins/Inspect Hoses

To prevent the inconvenience of having the generator
set shut down or become damaged due to overheating,
keep the cooling air inlets clean and unobstructed at all
times. Inspect the exterior of the radiator for
obstructions; remove all dirt and foreign material with a
soft brush or cloth (to avoid damaging radiator fins).
Check all hoses and connections for leaks and replace
any hoses that are cracked, frayed, or feel spongy.
When coolant level checks are made, check condition of
the radiator cap rubber seal; replace if cracked or
deteriorating. Remove dirt and other debris from the
radiator cap and filler neck.

Change Coolant

Coolant capacity for the 15/20 kW in-line radiator model
is 4 qts. 16 oz. (4.26 L). Consult the coach manufacturer
3-14 Scheduled Maintenance

Cooling System Servicing

for remote radiator cooling system capacity. Drain
petcocks are provided on the bottom tank of the radiator
and another in the engine block to drain the system.
When draining the coolant, remove the radiator cap and
open the block drain located near the flywheel housing;
this will allow the entire system to drain and prevent air
pockets from forming and restricting coolant passage in
the block. To refill the cooling system, close the drain
petcocks and fill the radiator to the proper level with the
recommended coolant mixture. Install the radiator cap
and operate the engine until the thermostat opens and
the radiator upper hose becomes hot. Stop the engine
and allow to cool. Add coolant to the radiator to just
below the overflow tube on the filler neck. Install the
radiator cap.
A coolant solution of 50% ethylene glycol and 50%
clean, softened water is required to inhibit corrosion,
prevent freezing to --34_F (--37_C), and to improve
cooling. The antifreeze should contain a rust inhibitor
and be changed every two years. Do not use alcohol or
methanol antifreeze or mix them with the coolant. Do not
add coolant to an engine that has overheated until the
engine has cooled. Adding coolant to an extremely hot
engine can cause a cracked block or cylinder head.

Check Coolant Level

Check coolant level frequently and add antifreeze
solution as needed to maintain level just below the
overflow tube and at the min. level in the coolant
recovery tank when cold (max. when hot).
Special attention should be given when checking for
proper coolant level. After a radiator has been drained,
some time is normally required before complete refill of
all air cavities take place.
NOTE
TP-5606 6/02