Engine Shutdown; Engine Protection-Warning And Shutdown - freightliner M2 Plus 2023 Manual

•
Refer to the engine manufacturer's operation
manual for recommended heaters, low-
viscosity lubricating oils, winter-grade fuels,
and approved coolants.
•
Periodically check the coolant mixing ratio
(concentration of antifreeze in the coolant). Add
more if necessary.
•
At outside temperatures below -4°F (-20°C), a
coolant preheater is recommended.
NOTICE
For Detroit engines (EPA07 and newer), use of a
winterfront is not recommended, as it can cause
false fault codes with the engine and
aftertreatment system, and possible emission
component failures.
If using a winterfront, leave at least 25% of the grille
opening exposed in sectioned stripes that run
perpendicular to the charge-air-cooler tube-flow
direction. This assures even cooling across each
tube, and reduces header-to-tube stress, and
possible chance of component failure. For engine-
specific guidelines, see below:
Cummins engines: A winterfront may be used to
improve cab heating while idling, and only when the
ambient temperature remains below 10°F (-12°C).
Detroit engines: Use of a winterfront is not
recommended. Using a winterfront can cause
excessive fan run time, increased fuel consumption,
and failure of the DEF system heaters to operate
correctly, resulting in fault codes, poor performance,
and power reduction. A winterfront should only be
used temporarily in the following situations:
•
To improve cab heating while idling in an
extremely cold ambient temperature;
•
When the ambient temperature remains below
-22°F (-30°C) and the engine is unable to
maintain a running coolant temperature of
175°F (80°C) during normal over-the-road
operation.
High-Altitude Operation
Engines lose horsepower when operated at high
altitude because the air is too thin to burn as much
fuel as at sea level. This loss equals about three
percent for each 1000 ft (300 m) altitude above sea
level for a naturally aspirated engine.
Engine Starting, Operation, and Shutdown
All engines used on Freightliner vehicles are altitude-
compensated by the use of a turbocharger. This
reduces smoky exhaust at high altitudes, requires
less downshifting, and allows the engine to make
better use of its fuel. Nevertheless, shift gears as
needed to avoid excessive exhaust smoke.

Engine Shutdown

1.
With the vehicle stopped, set the parking brake
and place the transmission in neutral.
NOTICE
Idle the engine one to two minutes before
shutting it down. After hard operation, shutting
down the engine without idling may cause
damage to the turbocharger.
2. Allow the engine to idle one to two minutes
before shutting it down. This allows the
lubricating oil and the coolant to carry heat away
from the combustion chambers, bearings, shafts,
and seals.
3.
Turn off the ignition switch and shut down the
engine.
Engine Protection—Warning
and Shutdown
The driver should be familiar with the vehicle warning
system in order to bring the vehicle to a safe stop if
necessary. If the driver doesn't understand how the
warning system works, they may not be able to
utilize the advantage of the advance warning system
to pull over appropriately.
The engine begins a warning and derate and/or
shutdown process if the engine coolant temperature,
coolant level, engine oil pressure, or exhaust
aftertreatment system (ATS) reach preset levels. On
some engines, the warning process begins when the
engine oil temperature, engine coolant temperature,
or the intake air temperature reach preset levels.
™
Detroit engines may also begin the warning and
shutdown process if water is detected in the fuel.
See the engine manufacturer's operation manual for
specific details for your vehicle. See
the warning and shutdown modes associated with
the ATS.
Electronic engine protection can be specified as
either SHUTDOWN or WARNING and DERATE.
Chapter 13 for
9.4