Perkins 2506 Operation And Maintenance Manual page 40

40
Operation Section
Fuel Related Components in Cold Weather
The following fuels can be used in this series of
engine.
• Group 1
• Group 2
• Group 3
• Special Fuels
Perkins prefer only Group 1 and Group 2 fuels for
use in this series of engines.
Group 1 fuels are the preferred Group of Fuels for
general use by Perkins. Group 1 fuels maximize
engine life and engine performance. Group 1 fuels
are usually less available than Group 2 fuels.
Frequently, Group 1 fuels are not available in colder
climates during the winter.
Note: Group 2 fuels must have a maximum wear
scar of 650 micrometers (HFRR to ISO 12156-1).
Group 2 fuels are considered acceptable for issues of
warranty. This group of fuels may reduce the life of
the engine, the engine's maximum power, and the
engine's fuel efficiency.
When Group 2 diesel fuels are used the following
components provide a means of minimizing problems
in cold weather:
• Glow plugs (if equipped)
• Engine coolant heaters, which may be an OEM
option
• Fuel heaters, which may be an OEM option
• Fuel line insulation, which may be an OEM option
There are three major differences between Group 1
fuels and Group 2 fuels. Group 1 fuels have the
following different characteristics to Group 2 fuels.
• A lower cloud point
• A lower pour point
• A lower energy per unit volume of fuel
Note: Group 3 fuels reduce the life of the engine. The
use of Group 3 fuels is not covered by the Perkins
warranty.
Group 3 fuels include Low Temperature Fuels and
Aviation Kerosene Fuels.
Special fuels include Biofuel.
The cloud point is a temperature that allows wax
crystals to form in the fuel. These crystals can cause
the fuel filters to plug.
The pour point is the temperature when diesel fuel
will thicken. The diesel fuel becomes more resistant
to flow through fuel lines, fuel filters,and fuel pumps.
Be aware of these facts when diesel fuel is
purchased. Consider the average ambient air
temperature for the engine's application. Engines that
are fueled in one climate may not operate well if the
engines are moved to another climate. Problems can
result due to changes in temperature.
Before troubleshooting for low power or for poor
performance in the winter, check the fuel for waxing.
Low temperature fuels may be available for engine
operation at temperatures below 0 °C (32 °F). These
fuels limit the formation of wax in the fuel at low
temperatures.
For more information on cold weather operation, refer
to the Operation and Maintenance Manual, "Cold
Weather Operation and Fuel Related Components in
Cold Weather".
Fuel Related Components in
Cold Weather
Fuel Tanks
Condensation can form in partially filled fuel tanks.
Top off the fuel tanks after you operate the engine.
Fuel tanks should contain some provision for draining
water and sediment from the bottom of the tanks.
Some fuel tanks use supply pipes that allow water
and sediment to settle below the end of the fuel
supply pipe.
Some fuel tanks use supply lines that take fuel
directly from the bottom of the tank. If the engine is
equipped with this system, regular maintenance of
the fuel system filter is important.
Drain the water and sediment from any fuel storage
tank at the following intervals: weekly, oil changes
and refueling of the fuel tank. This will help prevent
water and/or sediment from being pumped from the
fuel storage tank and into the engine fuel tank.
Fuel Filters
A primary fuel filter is installed between the fuel tank
and the engine fuel inlet. After you change the fuel
filter, always prime the fuel system in order to remove
air bubbles from the fuel system. Refer to the
Operation and Maintenance Manual in the
Maintenance Section for more information on priming
the fuel system.
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