Perkins 1106A-70T Operation And Maintenance Manual page 49

SEBU8728
When biodiesel fuel is used, crank case oil and
aftertreatment systems may be influenced. This
influence is due to the chemical composition and
characteristics of biodiesel fuel, such as density and
volatility, and to chemical contaminants that can be
present in this fuel, such as alkali and alkaline metals
(sodium, potassium, calcium, and magnesium).
• Crankcase oil fuel dilution can be higher when
biodiesel or biodiesel blends are used. This
increased level of fuel dilution when using
biodiesel or biodiesel blends is related to the
typically lower volatility of biodiesel. In-cylinder
emissions control strategies utilized in many of the
industrial latest engine designs may lead to a
higher level of biodiesel concentration in the
engine oil pan. The long-term effect of biodiesel
concentration in crankcase oil is currently
unknown.
• Perkins recommends the use of oil analysis in
order to check the quality of the engine oil if
biodiesel fuel is used. Ensure that the level of
biodiesel in the fuel is noted when the oil sample is
taken.
Performance Related Issues with B20
Due to the lower energy content than the standard
distillate fuel B20 will cause a power loss in order of 2
to 4 percent. In addition, over time the power may
deteriorate further due to deposits in the fuel injectors.
Biodiesel and biodiesel blends are known to cause an
increase in fuel system deposits, most significant of
which are deposits within the fuel injector. These
deposits can cause a loss in power due to restricted
or modified fuel injection or cause other functional
issues associated with these deposits.
Note: Perkins T400012 Fuel Cleaner is most
effective in cleaning and preventing the formation of
deposits. Perkins Diesel Fuel Conditioner helps to
limit deposit issues by improving the stability of
biodiesel and biodiesel blends. Refer to "Perkins
Diesel Fuel System Cleaner" for more information.
General Requirements
Biodiesel has poor oxidation stability, which can result
in long-term problems in the storage of biodiesel.
Biodiesel fuel should be used within 6 months of
manufacture. Equipment should not be stored with
the B20 biodiesel blends in the fuel system for longer
than 3 months.
Due to poor oxidation stability and other potential
issues, it is strongly recommended that engines with
limited operational time either not use B20 biodiesel
blends or, while accepting some risk, limit biodiesel
blend to a maximum of B5. Examples of applications
that should limit the use of biodiesel are the following:
Standby generator sets and certain emergency
vehicles.
Perkins strongly recommends that seasonally
operated engines have the fuel systems, including
fuel tanks, flashed with conventional diesel fuel
before prolonged shutdown periods. An example of
an application that should seasonally flush the fuel
system is a combine harvester.
Microbial contamination and growth can cause
corrosion in the fuel system and premature plugging
of the fuel filter. Consult your supplier of fuel for
assistance in selecting appropriate antimicrobial
additive.
Water accelerates microbial contamination and
growth. When biodiesel is compared to distillate fuels,
water is naturally more likely to exist in the biodiesel.
It is therefore essential to check frequently and if
necessary, drain the water separator.
Materials such as brass, bronze, copper, led, tin, and
zinc accelerate the oxidation process of the biodiesel
fuel. The oxidation process can cause deposits
formation therefore these materials must not be used
for fuel tanks and fuel lines.
Fuel for Cold Weather Operation
The European standard "EN590" contains climate
dependant requirements and a range of options. The
options can be applied differently in each country.
There are five classes that are given to arctic climates
and severe winter climates. 0, 1, 2, 3 and 4.
Fuel that complies with "EN590" CLASS 4 can be
used at temperatures as low as −44 °C (−47.2 °F).
Refer to "EN590" for a detailed discretion of the
physical properties of the fuel.
The diesel fuel "ASTM D975 1-D" that is used in the
United States of America may be used in cold
temperatures that are below −18 °C (−0.4 °F).
In extreme cold ambient conditions, you may use the
aviation kerosene fuels that are specified in
"Classification of the Fuels". These fuels are intended
to be used in temperatures that can be as low as
−54 °C (−65.2 °F). Refer to "Classification of the
Fuels" for detail and conditions of use of the aviation
kerosene fuels.
Mixing alcohol or gasoline with diesel fuel can
produce an explosive mixture in the engine crank-
case or the fuel tank. Alcohol or gasoline must
not be used in order to dilute diesel fuel. Failure
to follow this instruction may result in death or
personal injury.
49
Refill Capacities
Fluid Recommendations