Daimler Freightliner Cascadia 2021, Руководство пользователя

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If using a winterfront, leave at least 25% of the grille
opening exposed in sectioned stripes that run per-
pendicular to the charge-air-cooler tube-flow direc-
tion. 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 im-
prove cab heating while idling, and only when the
ambient temperature remains below 10°F (-12°C).
Detroit engines: Use of a winterfront is not recom-
mended. Using a winterfront can cause excessive
fan run time, increased fuel consumption, and failure
of the DEF system heaters to operate correctly, re-
sulting in fault codes, poor performance, and power
reduction. A winterfront should only be used tempo-
rarily in the following situations:
•
To improve cab heating while idling in an ex-
tremely 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 alti-
tude 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.
All engines used on Freightliner vehicles are altitude-
compensated by the use of a turbocharger. This re-
duces 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 shut-
ting 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 be-
fore 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, the driver may not be able to
utilize the advantage of the advance warning system
to pull over appropriately.
The engine will begin a warning and derate and/or
shutdown process if the engine coolant temperature,
coolant level, engine oil pressure, or exhaust after-
treatment system (ATS) reach preset levels. On
some engines, the warning process will begin when
the engine oil temperature, engine coolant tempera-
ture, or the intake air temperature reach preset lev-
els. 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
Chapter 14 for
the warning and shutdown modes associated with
the ATS.
Electronic engine protection can be specified as ei-
ther SHUTDOWN or WARNING and DERATE.
WARNING
When the STOP engine or CHECK engine lamp
illuminates, most engines are programmed to
shut down automatically within 30 seconds. The
driver must immediately move the vehicle to a
safe location at the side of the road to prevent
causing a hazardous situation that could cause
bodily injury, property damage, or severe damage
to the engine.
In SHUTDOWN mode, the red STOP engine lamp
will illuminate when the problem is serious enough to
reduce power or speed. See
Fig. 12.4 . Engine power
will ramp down, then the engine will shut down if the
problem continues while in derate mode. The driver
has 30 or 60 seconds (depending on the critical fault
type) after the STOP engine lamp illuminates to
move the vehicle safely off the road. If the vehicle
Engine Starting, Operation, and Shutdown
12.4