Checking And Filling Coolant; Cooling System Inspection; Draining Cooling System; Flushing And Cleaning - Kohler 24RCL Operation

4.6.1

Checking and Filling Coolant

Maintain the coolant level in the coolant overflow bottle
between the Hot and Cold markings. See Section 1,
Service Views, for the coolant overflow bottle location.
Note: Periodically check the coolant level by removing
the radiator's pressure cap. Do not rely solely on
the level in the coolant overflow bottle.
Ethylene glycol-based
recommended. Use a coolant mixture of 50% long-life
coolant and 50% clean, softened water to inhibit
rust/corrosion and prevent freezing. Add fresh coolant
until the level is just below the overflow tube opening.
A coolant solution of 50% ethylene glycol-based coolant
provides freezing protection to --37C (--34F) and
overheating protection to 149C (300F). A coolant
solution with less than 50% ethylene glycol may not
provide adequate freezing and overheating protection.
A coolant solution with more than 50% ethylene glycol
can cause engine or component damage. Do not mix
long-life coolant and conventional coolants. Do not mix
different types and/or colors of long life coolants.
4.6.2

Cooling System Inspection

To prevent generator shutdown or damage because of
overheating:
Keep the cooling air inlets clean and unobstructed
D
Inspect the radiator's exterior for obstructions and
D
remove dirt and foreign material with a soft brush or
cloth to avoid damaging the radiator fins.
Check the hoses and connections for leaks and
D
replace any cracked, frayed, or spongy hoses.
Check the condition and tension of the drive belt.
D
Check the rubber seal of the radiator's pressure cap
D
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. If
the cap leaks, replace it with the same rating type of
cap. Find the pressure cap rating in Figure 4-4.
Item
Pressure cap
Figure 4-4 Pressure Cap Rating
58 Section 4 Scheduled Maintenance
long-life coolant is
Rating
97 kPa (14 psi)
4.6.3

Draining Cooling System

The radiator contains a coolant drain valve to drain the
cooling system. When draining the coolant, remove the
radiator's pressure cap, which will allow the entire
system to drain and will prevent air pockets from forming
and restricting coolant passage to the block.
1. Remove the pressure cap to allow the entire
system to drain and prevent air pockets from
restricting coolant flow through the engine block.
2. Open the coolant drain valve and allow the system
to drain.
3. If the inside of the radiator has mineral deposits or
the used coolant contains dirt or grease, go to
Section 4.6.4, Flushing and Cleaning. If the cooling
system does not have mineral deposits, refill the
cooling system as instructed in Section 4.6.5,

Filling Cooling System.

4.6.4

Flushing and Cleaning

For optimum protection, drain, flush, and refill the
cooling system at the interval listed in the service
schedule.
Flushing and Cleaning Procedure
1. Flush the system with clean water.
2. Drain, clean, and flush the coolant overflow bottle.
3. Refill the cooling system as instructed in
Section 4.6.5.
4.6.5 Filling Cooling System
Model
24RCL, 30RCL, 38RCLB
Figure 4-5 Coolant Capacity (approximate)
Note: Do not add coolant to a hot engine. Adding
coolant to a hot engine can cause the cylinder
block or cylinder head to crack. Wait until engine
has cooled.
Note: It is very important to purge air from the cooling
system by following this entire procedure.
1. Close the radiator's coolant drain valve and tighten
the hose clamps.
2. Fill the radiator with the recommended coolant
mixture of 50% ethylene glycol and 50% clean,
Coolant Capacity, L (gal.)
Engine with
Block Heater
Engine
13.2 (3.5) 13.7 (3.6)
TP-6905 4/16