Kohler 15REYG Fonctionnement - Page 26

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3.6.2

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.

3.6.3

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 3-5 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. Operate the engine with the radiator cap removed

until the thermostat opens and the radiator upper

hose becomes hot.

4. Stop the engine and allow it to cool.

Model

All models

Figure 3-5 Coolant Capacity

Section 3 Scheduled Maintenance

freezing

and

overheating

Consult the engine

Coolant Capacity L (gal.)

11.5 L (3.0 gal.)

5. Add coolant to the radiator to just below the

overflow tube on the filler neck. See Section 1,

Service Views, for the overflow tube location.

6. Replace the radiator's pressure cap.

7. 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.

3.6.4

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. Remove the pressure cap and open the radiator's

coolant drain valve and let the system drain

completely. Remove the pressure cap to simplify

draining.

2. Drain, clean, and flush the coolant overflow bottle.

3. Flush the system with clean water.

4. Close the radiator's coolant drain valve.

5. Fill the system with the recommended coolant.

6. Replace the pressure cap.

3.6.5

Pressure Cap

The cooling system utilizes a pressure cap to raise the

boiling point of the coolant, enabling higher operating

temperatures. If the cap leaks, replace it with a cap of the

same rating. Find the pressure cap rating in Figure 3-6.

Item

Pressure Cap

Thermostat

Figure 3-6 Pressure Cap and Thermostat Rating

Rating

97 kPa (14 psi)

91_C (195_F)

TP-6728 10/11