Perkins 2806A-E18TA Operation And Maintenance Manual page 65

SEBU9074-06
Due to poor oxidation stability and other potential
issues, Perkins recommends that engines with
limited operational time either do not use 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.
For standby generator sets and emergency vehicles
that cannot avoid use of biodiesel blends fuel quality
in the engine fuel tank must be sampled and checked
monthly. Test should include acid number
(EN14104), oxidation stability (EN 15751 commonly
know as the Rancimant test), and sediment
(ISO12937). For standby generator sets oxidation
stability of biodiesel blend must be 20 hours or more
as per EN 15751. If the test shows that the fuel has
degraded, fuel tank must be drained and engine
flashed by running with the fresh high-quality diesel
fuel.
For standby generator sets and emergency vehicles
that cannot avoid use of biodiesel blends fuel quality
in the engine fuel tank must be sampled and checked
monthly. Test should include acid number
(EN14104), oxidation stability (EN 15751 commonly
know as the Rancimant test), and sediment
(ISO12937). For standby generator sets oxidation
stability of biodiesel blend must be 20 hours or more
as per EN 15751. If the test shows that the fuel has
degraded, fuel tank must be drained and engine
flashed by running with fresh high-quality diesel fuel.
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. Frequent checks are therefore essential
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" fora 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 Group 2.
These fuels are intended to be used in temperatures
that can be as low as −54 °C (−65.2 °F). Refer to
Group 2 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
crankcase 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.
There are many other diesel fuel specifications that
are published by governments and by technological
societies. Usually, those specifications do not review
all the requirements that are addressed in table 13 .
To ensure optimum engine performance, a complete
fuel analysis should be obtained before engine
operation. The fuel analysis should include all the
properties that are stated in the table 13 .
Aftermarket Fuel Additives
NOTICE
Perkins does not warrant the quality or performance
of non-Perkins fluids and filters.
When auxiliary devices, accessories, or consum-
ables (filters, additives) which are made by other
manufacturers are used on Perkins products, the
Perkins warranty is not affected simply because of
such use.
However, failures that result from the installation
or use of other manufacturers devices, accesso-
ries, or consumables are NOT Perkins defects.
Therefore, the defects are NOT covered under the
Perkins warranty.
Supplemental diesel fuel additives are not generally
recommended, This recommendation is due to
potential damage to the fuel system or the engine.
Perkins recognizes the fact that additives may be
required in some special circumstances. Fuel
additives must be used with caution. Contact your
fuel supplier for those circumstances when fuel
additives are required. Your fuel supplier can
recommend the appropriate fuel additive and the
correct level of treatment.
65
Maintenance Section
General Fuel Information