Engine Coolant; Handling Of Coolant - Yanmar 6LY3 series Service Manual

Engine Coolant

12/05
ENGINE COOLANT
Mix clean deionized soft water with Long Life
Coolant (LLC) in order to prevent rust buildup and
freezing. NOTICE: NEVER use water only.
Freezing water will cause serious damage to the
engine.
LLC must conform to the following specifications:
• JIS K-2234
• SAE J814C, J1941, J1034, J2036
• ASTM D3306
• ASTM D4985
Yanmar recommends using genuine Yanmar
coolant / antifreeze. Contact your authorized
Yanmar dealer or distributor.
Recommended Engine Coolants:
• TEXACO LONG LIFE COOLANT ANTIFREEZE,
both standard and pre-mixed. Product code
79947 and 7998.
• HAVOLINE EXTENDED LIFE ANTIFREEZE /
COOLANT. Product code 7994.
NOTICE:
• Always be sure to add LLC to soft water. It is
particularly important to add LLC during cold
weather. Without LLC, coolant performance will
decrease due to scale and rust in the coolant
system.
• Mix the proper amount of coolant concentrate
specified by the LLC manufacturer for the
ambient temperature in which you will be
operating. LLC concentration should be between
30% and 60%.
• Mixing different types of LLC is harmful because
it causes sludge buildup.
• NEVER use hard water.
• Use only clean deionized soft water when mixing
LLC.
6LY3 Service Manual
GENERAL SERVICE INFORMATION

Handling of Coolant

1. Replace the coolant periodically, according to
the maintenance schedule in the Operation
Manual.
2. Remove the scale from the coolant system
periodically, according to the instructions for
your engine.
NOTICE: Excessive mixture of LLC lowers the
cooling efficiency of the engine. Use the mixing
ratios specified by the LLC manufacturer for the
temperature range in which you will be operating.
© 2007 Yanmar Marine International
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