Specifications - Yanmar 6LY3-STC Operation Manual

BEFORE YOU OPERATE
Bio-Diesel Fuels
Yanmar approves the use of biodiesel fuels
that do not exceed a blend of 5% non-
mineral oil based fuel with 95% standard
diesel fuel. Such biodiesel fuels are known
in the marketplace as B5 biodiesel fuels. B5
biodiesel fuel can reduce particulate matter
and the emission of "greenhouse" gases
compared to standard diesel fuel.
CAUTION! If the B5 biodiesel fuel used
does not meet the approved
specifications, it will cause abnormal
wear of injectors, reduce the life of the
engine and it may affect the warranty
coverage of your engine.
B5 diesel fuels must meet certain

specifications

The biodiesel fuels must meet the minimum
specifications for the country in which they
are used:
• In Europe, biodiesel fuels must comply
with the European Standard EN14214.
• In the United States, biodiesel fuels must
comply with the American Standard ASTM
D-6751.
Biodiesel should be purchased only from
recognized and authorized diesel fuel
suppliers.
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Precautions and concerns regarding
the use of bio-fuels:
• Biodiesel fuels have a higher content of
methyl-esters, which may deteriorate
certain metal, rubber and plastic
components of the fuel system. The
customer and / or boat builder are
responsible to verify the usage of biodiesel
compatible components on the vessel fuel
supply and return systems.
• Free water in biodiesel may result in
plugging of fuel filters and increased
bacterial growth.
• High viscosity at low temperatures may
result in fuel delivery problems, injection
pump seizures, and poor injection nozzle
spray atomization.
• Biodiesel may have adverse effects on
some elastomers (seal materials) and may
result in fuel leakage and dilution of the
engine lubricating oil.
• Even biodiesel fuels that comply with a
suitable standard as delivered, will require
additional care and attention to maintain
the quality of the fuel in the equipment or
other fuel tanks. It is important to maintain
a supply of clean, fresh fuel. Regular
flushing of the fuel system, and / or fuel
storage containers, may be necessary.
• The use of biodiesel fuels that do not
comply with the standards as agreed to by
the diesel engine manufacturers and the
diesel fuel injection equipment
manufacturers, or biodiesel fuels that have
degraded as per the precautions and
concerns above, may affect the warranty
coverage of your engine.
6LY3 LDC Operation Manual
© 2008 Yanmar Marine International