BEFORE YOU OPERATE
26
6LT Series Operation Manual
DIESEL FUEL SPECIFICATIONS
Diesel fuel is flammable and explosive under
certain conditions.
Only use diesel fuels recommended by Yanmar for
the best engine performance, to prevent engine
damage and to comply with EPA warranty
requirements. Only use clean diesel fuel.
Diesel fuel should comply with the following
specifications: Fuel compliant with standard
EN 590, (Sulfur content less than 10 ppm) and/or
ASTM D975 (Sulfur content less than 15 ppm).
The table lists several worldwide specifications for
diesel fuels.
Biodiesel Fuels
Yanmar approves the use of biodiesel fuels that do
not exceed a blend of 7% non-mineral oil based
fuel with 93% standard diesel fuel. Such biodiesel
fuels are known in the marketplace as B7 biodiesel
fuels. B7 biodiesel fuel can reduce particulate
matter and the emission of “greenhouse” gases
compared to standard diesel fuel.
If the B7 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.
B7 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 EN590-2009, EN14214.
• In the United States, biodiesel fuels must comply
with the American Standard ASTM D-6751
Grade-S15, D7467 Grade B7-S15.
Biodiesel should be purchased only from
recognized and authorized diesel fuel suppliers.
Precautions and concerns regarding the use of
biofuels:
• 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, supply 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.
DIESEL FUEL
SPECIFICATION
LOCATION
ASTM D975 No. 2-D S15,
No. 1-D S15
USA
EN590-2009 European Union
ISO 8217 DMX International
BS 2869-A1 or A2 United Kingdom
JIS K2204 Grade No. 2 Japan
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