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ENGINE COOLANT

Engine Coolant Specifications

• Texaco Long Life Coolant (LLC), both

standard and premixed, product code

7997 and 7998.

• Havoline Extended Life

Antifreeze / Coolant, product code 7994.

Note: In the U.S., LLC is required for the

warranty to be valid.

Engine Coolant

NOTICE: Always add LLC to soft

water - especially when operating in

cold weather. Without LLC, cooling

performance will decrease due to scale

and rust in the cooling system. Water

alone may freeze and form ice; it

expands approximately 9% in volume.

Use the proper amount of coolant

concentrate for the ambient

temperature as specified by the LLC

manufacturer. LLC concentration

should be a minimum of 30% to a

maximum of 60%. Too much LLC will

decrease the cooling efficiency also. Do

not mix different types or brands of LLC

or a harmful sludge may form. Do not

use hard water. Water should be clean

and free from sludge or particles.

Following the manufacturer’s

recommendations, use a proper LLC

which will not have any adverse effects

on the materials (cast iron, aluminum,

copper, etc.) of the engine’s fresh water

cooling system. See Engine Coolant

Specifications on page 33.

Excessive use of antifreeze also lowers

the cooling efficiency of the engine. Be

sure to use the mixing ratios specified

by the antifreeze manufacturer for the

temperature range.

Replace engine coolant periodically,

according to the maintenance schedule

in this Operation Manual.

Remove scale from the cooling system

periodically by flushing the system.

Do not mix different brands of

antifreeze. Chemical reactions may

make the antifreeze useless and engine

problems may result.

BEFORE YOU OPERATE

6LPA Series Operation Manual 33

© 2007 Yanmar Marine International

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