Engine Coolant; Engine Coolant Specifications - Yanmar BY Series Service Manual

Engine Coolant

GENERAL SERVICE INFORMATION
12/05
ENGINE COOLANT
WARNING! Fire Hazard. Coolant may be
flammable under certain conditions. NEVER
allow coolant to come into contact with hot
surfaces or insulation material.
CAUTION! Exposure Hazard. Wear protective
rubber gloves and eye protection when
handling Long Life Coolant Antifreeze. Flush
eyes and exposed skin with water immediately
after contact.

Engine Coolant Specifications

Note: In the U.S., LLC is required for the
warranty to be valid.
NOTICE: 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 cooling
system.
Engine Coolant Mixture
NOTICE: ALWAYS add LLC to soft water –
especially when operating in cold weather. NEVER
use hard water. Water should be clean and free
from sludge or particles. Without LLC, cooling
performance will decrease due to scale and rust in
the coolant 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. Excessive
use of antifreeze also lowers the cooling efficiency
of the engine. NEVER mix different types or brands
of LLC, as a harmful sludge may form. Mixing
different brands of antifreeze may cause chemical
reactions, and may make the antifreeze useless or
cause engine problems.
Remove scale from the cooling system periodically
by flushing the system.
BY Service Manual 3-19
© 2009 Yanmar Marine International