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Cooling System
Add coolant to overfl ow reservoir as required, which
is a 50/50 mixture of ethylene glycol and water
(distilled or deionized water is recommended).
Drain Cooling System
Radiator Drain Plug Details
A
Radiator Drain Plug
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.
Loosen/remove radiator drain plug and allow coolant
to drain.
2. 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.
3. Reinstall reservoir cap. Do not kink/pinch hose.
4. Flush cooling system.
Flushing Cooling System
NOTE: To prevent engine damage, do not pour water
into a hot engine. Do not operate engine without
coolant.
With system properly drained:
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.
64
Filling Cooling System
NOTE: To prevent engine damage, do not use
Cooling system capacity is approximately 2 liters
(2.18 qt.).
1. Check condition of cooling system hoses, clamps,
2. Fill with 2.0 L (2.1 U.S. qt.) equal parts of ethylene
A
3. Fill radiator with coolant mixture. Allow coolant to
4. Start and run engine for fi ve minutes. Stop engine
5. Recheck coolant level in reservoir. Coolant level
Inspection
Cooling Fan Assembly, Belt, and Drive Pulleys
Cooling fan assembly, used to draw air through radiator,
is attached to a hub and pulley assembly with sealed
ball bearings. This assembly is belt driven off fl ywheel,
via a lower split pulley, and requires very little service or
maintenance. DO NOT operate engine without fan and
properly functioning cooling system or engine damage
will occur.
1. Inspect fan for any cracks, damaged/missing fan
2. Bearings in hub of pulley should rotate smoothly,
3. V-groove of each pulley (upper and lower) should
4. Drive belt is designed and constructed for this
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antifreeze mixture greater than 70% ethylene
glycol in cooling system. Do not use antifreeze
with stop-leak additive(s) or mix/add other
additives to cooling system. Use only ethylene
glycol antifreeze.
and associated components. Replace as required.
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.
drain into lower areas. Fill overfl ow reservoir to a
level between FULL and ADD marks. Reinstall
radiator and reservoir caps.
and allow to cool.
should be between FULL and ADD marks. Add
coolant to reservoir if required.
blades, and secure mounting.
without roughness, binding, or play/wobble.
not be bent, nicked, or damaged. Pulley mounting
areas and lower pulley shims should be free of any
cracks or elongation.
system. Do not use a substitute belt. Check overall
condition and replace belt if cracked, damaged, or
proper tension cannot be established by
repositioning of lower pulley shims. Use only Kohler
Part No. 66 203 02-S belt if replacement is
necessary.
See a Kohler authorized dealer for any necessary
service.
66 690 14 Rev. A
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