Kohler 12.5EFORDB Funzionamento - Pagina 27

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3.7 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.

3.7.1

Checking the Cooling System

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. 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. See Figure 3-7. Remove dirt and

other debris from the pressure cap and filler neck. See

Figure 3-8 for thermostat rating. See Figure 3-9 for

coolant capacities.

Pressure Cap Rating

10EOR(Z)DB and 9EFOR(Z)DB

15EOR(Z)DB and 12.5EFOR(Z)DB

20EOR(Z)DB and 16.5EFOR(Z)DB

30/40EORZDB and 25/33EFORZDB

Figure 3-7 Pressure Cap Rating (For Inline Radiator

Models)

Thermostat Rating

All Models

Figure 3-8 Thermostat Rating

TP-6551 2/14

97 kPa

(14 psi)

83--110 kPa

(12--16 psi)

48 kPa

(7 psi)

82_C (179_F)

Model

10EOR(Z)DB

9EFOR(Z)DB

15EOR(Z)DB

12.5EFOR(Z)DB

20EOR(Z)DB

16.5EFOR(Z)DB

30EORZDB

25EFORZDB

40EORZDB

33EFORZDB

Figure 3-9 Coolant Capacities

3.7.2

Draining the 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.

3.7.3

Filling the Cooling System

1. Remove the radiator's pressure cap.

2. Close the radiator's and/or engine block's coolant

drain valve(s) 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.

3. Fill the radiator with the recommended long-life

coolant or an extended-life coolant.

Figure 3-10 for coolant recommendations.

Coolant Specifications

United States

ASTM D6210, D4985

Japan

JIS No. K-2234

International

SAE J814C, J1941, J1034, or J2036

Figure 3-10 Coolant Recommendations

Note: Always use a mix of coolant and water. Never use

water only.

Note: Follow the coolant manufacturer's instructions for

mixing coolant and water.

Section 3 Scheduled Maintenance

Engine & Unit-

Engine,

Mounted Radiator,

L (Qts.)

1.8 (1.9)

4.1 (4.3)

2.0 (2.1)

9.1 (9.6)

2.7 (2.8)

9.3 (9.8)

4.2 (4.4)

15 (16)

4.2 (4.4)

15.8 (16.7)

See