Kohler 15RYG Operation - Page 26

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3.8 Cooling System

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.

3.8.1

Checking and Filling Coolant

Maintain the coolant level in the coolant overflow bottle

between the High and Low 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. Add fresh

coolant until the level is just below the overflow

tube opening.

When checking the coolant level, also check the rubber

seal of the radiator's pressure cap and replace a

cracked or deteriorated cap. 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 3-9. Remove dirt and other debris from the

pressure cap and filler neck.

To prevent generator shutdown or damage because of

overheating, keep the cooling air inlets clean and

unobstructed at all times. Inspect the radiator's exterior

for obstructions and 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

replace any cracked, frayed, or spongy hoses.

Section 3 Scheduled Maintenance

3.8.2

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: this will allow the entire system

to drain and will prevent air pockets from forming and

restricting coolant passage to the block.

Note: Pay special attention to the coolant level. After

the coolant drains, allow time for complete refill of

the engine water jacket. Check the coolant level

as described earlier.

3.8.3

Filling Cooling System

1. Close the radiator's coolant drain valve and tighten

the hose clamps.

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.

2. Fill the radiator with the recommended coolant

mixture of 50% ethylene glycol and 50% clean,

softened water to inhibit rust/corrosion and prevent

freezing. See Figure 3-8 for coolant capacity

Note: A coolant solution of 50% ethylene glycol

provides freezing protection to --37°C

(--34°F) and overheating protection to

129°C (265°F). A coolant solution with less

than 50% ethylene glycol may not provide

adequate

protection. A coolant solution with more

than 50% ethylene glycol can cause engine

or component damage. Do not use alcohol

or methanol antifreeze or mix them with the

specified coolant.

manufacturer's operation manual for engine

coolant specifications.

3. Replace the radiator's pressure cap.

4. Operate the engine until the thermostat opens and

the radiator upper hose becomes hot.

5. Stop the engine and allow it to cool.

Model

All models

Figure 3-8 Coolant Capacity

freezing

and

overheating

Consult the engine

L (Qt.)

11.5 (3.0)

TP-6197 3/06