Engine Shutdown; High-Altitude Operation - freightliner cascadia Driver Manual

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 aftertreat-
ment system, and possible emission component
failures.
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 and Mercedes-Benz 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 (EPA07 and newer): Use of a winter-
front is not recommended. Using a winterfront can
cause excessive fan run time, increased fuel con-
sumption, and failure of the DEF system heaters to
operate correctly, resulting in fault codes, poor per-
formance, and power reduction. A winterfront should
only be used temporarily 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 Starting, Operation, and Shutdown

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.
NOTICE
Except in an emergency, do not shut down the
engine when the coolant temperature is above
194°F (90°C). To do so could damage the engine.
3. Turn off the ignition switch and shut down the
engine.
10.4