Diesel Fuel Characteristics - Perkins 1206F-E70TA Operation And Maintenance Manual

84
Refill Capacities
Fluid Recommendations
The fuel specifications that are listed in the table 24
are released as acceptable to use on all 1200 series
of engine.
Table 24
Fuel Specification
EN590
ASTM D975 GRADE 1D S15
ASTM D975 GRADE 2D S15
JIS K2204
BS 2869: 2010 CLASS A2 or EU equivalent
(1) All the fuels must comply with the specification in the table for the Perkins Specification Distillate Diesel Fuel .

Diesel Fuel Characteristics

Cetane Number
Fuel that has a high cetane number will give a shorter
ignition delay. A high cetane number will produce a
better ignition quality. Cetane numbers are derived for
fuels against proportions of cetane and
heptamethylnonane in the standard CFR engine.
Refer to ISO 5165 for the test method.
Cetane numbers in excess of 45 are normally
expected from current diesel fuel. However, a cetane
number of 40 may be experienced in some territories.
The United States of America is one of the territories
that can have a low cetane value. A minimum cetane
value of 40 is required during average starting
conditions. A fuel with higher cetane number is
recommended for operations at high altitudes or in
cold-weather operations.
Fuel with a low cetane number can be the root cause
of problems during a cold start.
Viscosity
Viscosity is the property of a liquid of offering
resistance to shear or flow. Viscosity decreases with
increasing temperature. This decrease in viscosity
follows a logarithmic relationship for normal fossil
fuel. The common reference is to kinematic viscosity.
Kinematic viscosity is the quotient of the dynamic
viscosity that is divided by the density. The
determination of kinematic viscosity is normally by
readings from gravity flow viscometers at standard
temperatures. Refer to ISO 3104 for the test method.
Acceptable Fuel Specification for the 1200 Series of Engines (1)
Comments
European Automotive Diesel Fuel (DERV)
"North American Light Distillate Diesel fuel with less than 15 PPM sulfur
level"
"North American Middle Distillate general purpose Diesel fuel with less
than 15 PPM sulfur level"
"Japanese Diesel Fuel" Must meet the requirements that are stated in
the section "Lubricity".
"EU Off Road Diesel fuel. Acceptable from 2011 MUST have less than
10 PPM sulfur level"
The viscosity of the fuel is significant because fuel
serves as a lubricant for the fuel system components.
Fuel must have sufficient viscosity in order to
lubricate the fuel system in both extremely cold
temperatures and extremely hot temperatures . If the
kinematic viscosity of the fuel is lower than "1.4 cSt"
at the fuel injection pump, damage to the fuel injection
pump can occur. This damage can be excessive
scuffing and seizure. Low viscosity may lead to
difficult hot restarting, stalling, and loss of
performance. High viscosity may result in seizure of
the pump.
Perkins recommends kinematic viscosities of 1.4 and
4.5 mm2/sec that is delivered to the fuel injection
pump. If a fuel with a low viscosity is used, cooling of
the fuel may be required to maintain 1.4 cSt or
greater viscosity at the fuel injection pump. Fuels with
a high viscosity might require fuel heaters in order to
lower the viscosity to 4.5 cSt at the fuel injection
pump.
Density
Density is the mass of the fuel per unit volume at a
specific temperature. This parameter has a direct
influence on engine performance and a direct
influence on emissions. This influence determines
from a heat output given injected volume of fuel. This
parameter is quoted in the following kg/m
(59 °F).
Perkins recommends a density of 841 kg/m
to obtain the correct power output. Lighter fuels are
acceptable but these fuels will not produce the rated
power.
SEBU8732
3
at 15 °C
3 in order