Note: Perkins discourages the use of all air flow
restriction devices such as radiator shutters.
Restriction of the air flow can result in the following:
high exhaust temperatures, power loss, excessive fan
usage and reduction in fuel economy.
A cab heater is beneficial in very cold weather. The
feed from the engine and the return lines from the cab
should be insulated in order to reduce heat loss to the
outside air.
Insulating the Air Inlet and Engine
Compartment
When temperatures below −18 °C (−0 °F) will be
frequently encountered, an air cleaner inlet that is
located in the engine compartment may be specified.
An air cleaner that is located in the engine
compartment may also minimize the entry of snow
into the air cleaner. Also, heat that is rejected by the
engine helps to warm the intake air.
Additional heat can be retained around the engine by
insulating the engine compartment.
i05927268
Fuel and the
Effect from Cold
Weather
Note: Only use grades of fuel that are recommended
by Perkins . Refer to this Operation and Maintenance
Manual, “Fluid Recommendations”.
Properties of the diesel fuel can have a significant
effect on the engine cold start capability. Critical to the
low temperature properties of diesel fuel is the
acceptability for the minimum ambient temperature
the engine is expected to see in operation. Following
properties are used to define fuels low temperature
capability:
• Cloud point
• Pour point
• Cold Filter Plugging Point (CFPP)
The cloud point of the fuel is the temperature at which
waxes naturally found in diesel fuel begins to form
crystals. The cloud point of the fuel must be below
lowest ambient temperature to prevent filters from
plugging.
CFPP is a temperature at which a particular fuel will
pass through a standardized filtration device. The
CFPP gives an estimate of the lower operability
temperature of fuel.
Pour point is the last temperature before the fuel flow
stops and waxing of the fuel will start.
Be aware of these properties when diesel fuel is
purchased. Consider the average ambient air
temperature for the engines application. Engines that
are fueled in one climate may not operate well if the
engines are shipped to colder 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.
The following components can provide a means of
minimizing fuel waxing problems in cold weather:
• Fuel heaters, which may be an OEM option
• Fuel line insulation, which may be an OEM option
Winter and arctic grades of diesel fuel are available in
the countries and territories with severe winters. For
more information refer to the Operation and
Maintenance Manual, “Cold Weather Operation”
Another important fuel property which can affect cold
start and operation of diesel engine is cetane number.
For more information refer to the Operation and
Maintenance Manual, “Fluid Recommendations”.
i01903588
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
It is possible that 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.
SEBU7833 33
Cold Weather Operation
Fuel and the Effect from Cold Weather
To Next Page
Loading...
