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Air Cooling

Hot Parts can cause severe

burns.

Do not touch engine while

operating or just after stopping.

Never operate engine with heat shields or

guards removed.

NOTE: Operating engine with a restricted air

intake screen or radiator, damaged/

broken fan assembly, or missing fan

shroud will cause engine damage due

to over heating.

Proper cooling is essential. To prevent over

heating, clean screens, cooling ﬁ ns, and other

external surfaces of engine. Avoid spraying

water at wiring harness or any electrical

components. See Maintenance Schedule.

Cooling System

Hot liquid can cause severe

burns.

Do not loosen radiator cap while

engine is operating or warm to

touch.

Liquid coolant can get extremely hot from

operation. Turning radiator cap when engine

is hot can allow steam and scalding liquid

to blow out and burn you severely. Shut off

machine. Only remove radiator cap when

cool enough to touch with bare hands. Slowly

loosen cap to ﬁ rst stop to relieve pressure

before removing completely.

NOTE: Do not operate engine without fan and

cooling system functioning properly, or

engine damage will occur.

This engine is liquid-cooled, circulating a

mixture of ethylene glycol and water for

dependable operation. Maintaining correct

coolant level and cleaning any debris

accumulation from inlet screen and radiator

surfaces are critical to ensuring long life,

proper system performance, and preventing

overheating. A drive belt is designed and

constructed for this application. Do not use a

substitute belt. If belt is cracked, damaged,

or adequate tension does not exist, have

necessary servicing performed by a Kohler

authorized dealer.

Drain Cooling System

1. Ensure engine is cool. When radiator is cool

to touch, slowly loosen radiator cap to ﬁ rst

stop and allow any pressure to bleed off.

Then loosen it fully and remove it.

66 590 05 Rev. --

WARNING

KohlerEngines.com

Loosen/remove radiator drain plug and allow

coolant to drain.

2. If equipped, remove coolant drain plugs

located on each side of engine block. Drain

coolant into a suitable container. After

coolant has drained completely, apply pipe

sealant with Teﬂ on

equivalent), to threads and reinstall plugs.

Torque plugs to 325 in. lb. (36.7 N·m).

3. Remove overﬂ ow hose from reservoir.

Unhook inboard retainer and slide reservoir

out of supports. Pour out contents and wash

or clean as required. Dispose of all old

coolant in accordance with local ordinances.

4. Reinstall reservoir cap. Do not kink/pinch

hose.

5. Flush cooling system.

Flush Cooling System

1. Fill cooling system with clean water and a

cooling system cleaner recommended for

aluminum engines. Follow directions on

container.

2. Reinstall and tighten radiator cap.

3. Start and run engine for ﬁ ve minutes, or until

it reaches operating temperature. Stop

engine and allow it to cool.

4. Drain cooling system.

5. Fill cooling system.

Fill Cooling System

1. Check condition of cooling system hoses,

clamps, and associated components.

Replace as required.

2. Fill with 2.1 U.S. qt. (2.0 L) equal parts of

ethylene glycol (anti-freeze) and water only.

Distilled or deionized water is recommended,

especially in areas where water contains a

high mineral content. Propylene glycol based

anti-freeze is not recommended.

3. Fill radiator with coolant mixture. Allow

coolant to drain into lower areas. Fill overﬂ ow

reservoir to a level between FULL and ADD

marks. Reinstall radiator and reservoir caps.

4. Start and run engine for ﬁ ve minutes. Stop

engine and allow to cool.

5. Recheck coolant level in reservoir. Coolant

level should be between FULL and ADD

marks. Add coolant to reservoir if required.

Repairs/Service Parts

We recommend that you use a Kohler

authorized dealer for all maintenance,

service, and replacement parts for engine.

To ﬁ nd a Kohler authorized dealer visit

KohlerEngines.com or call 1-800-544-2444

(U.S. and Canada).

(Loctite

PST

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