Kohler Aegis LH640 User Manual download pdf (Page 10)

6. Apply a thin film of clean oil to the rubber gasket

on the new filter.

7. Install the new oil filter to the filter adapter. Hand

tighten the filter (clockwise) until the rubber

gasket contacts the adapter, then tighten the filter

an additional 3/4 to 1 turn.

8. Fill the crankcase with new oil of the proper type,

to the ‘‘F’’ mark on the dipstick. Refer to Oil Type

and Check Oil Level on pages 4 and 9. Always

check the level with the dipstick before adding

more oil.

9. Reinstall the oil fill cap and tighten securely by

turning to the right.

• To prevent engine damage, do not use anti-freeze

with stop-leak additive(s) or put other additives

in the cooling systems.

Maintenance

This engine is liquid-cooled, circulating a mixture of

ethylene glycol and water for dependable operation. A

pump is used to circulate the coolant through the

system and radiator. A thermostat contained in the

system assures automatic temperature control and

rapid warm-up. Maintaining the correct coolant level

and cleaning any debris accumulation from the inlet

screen and radiator surfaces are critical to ensuring

long life, proper system performance, and preventing

overheating. Check the coolant level in the overflow

reservoir, and clean away any debris accumulation

daily or before each use. At the same time, inspect the

hoses and all connections for signs of leakage.

Servicing

Engine coolant should be changed every 2 years or

every 1000 hours, whichever comes first. When

changing the engine coolant, the system should also

be flushed to remove any contaminants left behind

during draining. Following are recommended

procedures for checking, draining, flushing, and filling

the cooling system.

Checking Coolant Level

The coolant level should be checked at the overflow

reservoir, located within the formed supports of the

fan shroud. See Figure 9.

Figure 9. Overflow Reservoir Location.

1. Check the coolant level in the overflow reservoir.

Coolant level should be between the ‘‘FULL’’ and

‘‘ADD’’ marks on the reservoir. See Figure 10. Do

not operate the engine with the coolant level

below the ‘‘ADD’’ mark.

Add coolant to the overflow reservoir as

required. Use equal parts of ethylene glycol and

water only (distilled or deionized water is

recommended).

Oil Filter

Oil Drain Plug

Figure 8. Oil Drain Plugs and Oil Filter.

Cooling System Maintenance and Service

Important service notes:

• Do not operate the engine without coolant in

the system.

• Do not remove the radiator cap when hot. Engine

coolant is hot and under pressure and can cause

severe burns.

• To prevent engine overheating and damage, use

the recommended anti-freeze mixture in the

cooling system.

• To prevent engine damage, do not pour cold

water into a hot engine.

• Cooling system capacity is approximately 2 L

(2.18 qt.).

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Kohler Aegis LH640 User Manual Page 10

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