Engine Coolant Specifications; Coolant (Fresh Water Cooling System) - Yanmar 6LY3 series Operation Manual

Engine Coolant Specifications

Use a Long Life Coolant (LLC) that meets
or exceeds the following guidelines and
specifications:
Note: In the U.S., LLC is required for
the warranty to be valid.
• ASTM D3306, D4985 (US)
• JIS K-2234 (Japan)
• SAE J814C, J1941, J1034 or J2036
(International)
Coolant (Fresh Water Cooling
System)
IMPORTANT
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.
6LY3 Operation Manual
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BEFORE YOU OPERATE
Following the manufacturer's
recommendations. Use the 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 47.
Replace engine coolant periodically,
according to the maintenance schedule in
this Operation Manual.
Remove scale from the cooling system
periodically by flushing the system.
47