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STARTING AND DRIVING
STARTING THE VEHICLE
carbon and/or varnish build-up occurs
and lubricating oil becomes
contaminated with combustion by-
products.
Cold-weather operations place added
demands on a diesel engine. When
operating in cold climates (particularly in
stop-and-go operations, PTO operations
or periods of extended engine idling),
maintain minimum operating
temperature. Otherwise engine damage
resulting from valve varnishing and
carbon build-up can occur.
NOTE
Many accessories are available for cold-
weather operations. Refer to the
Maintenance and Lubrication Manual for
additional information concerning cold-
weather accessories.
Engine Idling
Idling the engine unnecessarily for long
periods of time wastes fuel, fouls
injector nozzles and can lead to valve
carbon and varnish deposits. Unburned
fuel causes carbon formation and oil
dilution. Shut down engine when
prolonged loading or unloading of cargo
is required.
To prevent wear and possible damage to
the engine when it is cold, gradually
bring it up to operating temperature
before operating at high engine speeds
or full load. Ensure that the Park Brake is
engaged, and allow 10 minutes of idle
time before departing. Low Idle speed is
sufficient for warming up the engine, and
you may notice a change in engine note.
Operate at partial load until the coolant
temperature reaches 75
℃
(167°F).
Engine Shut Down
Standard Shutdown
After a hard run, allow the engine to idle
three minutes before shutdown in order
to stabilize the temperature of all engine
parts. Quick shutdowns can cause
engine damage and prevent the
turbocharger from being properly
lubricated.
Shutdown Option: Idle Cooldown
This feature provides a means of cooling
down the engine and turbocharger. If the
idle cooldown option is enabled and the
system senses that the turbocharger can
be hot, the engine will not shut down.
Specifically this situation occurs when
the vehicle stops, the parking brake is
set, and the key switch is turned to the
OFF position. This feature allows the
driver to lock the truck and walk away
while still providing adequate cooldown.
All switched accessories then turn off
once the engine has stopped. If this
option is set, the engine can be shut
down immediately by cycling the key
switch or by pressing the shutdown
override switch.
The idle cooldown timer is set to 3.5
minutes when the engine load exceeds
25%. This state occurs if the engine has
been running at least 60 seconds. After
the load drops below 25%, the timer
begins counting down. If the key switch
is turned off before the timer expires, the
engine continues to run until the timer
reaches zero.
If a pyrometer is installed, the idle
cooldown function uses the pyrometer
reading to shut down the engine. This
action occurs when the temperature
drops below 232°C (450°F), or after 3.5
minutes, whichever comes first.
The default for this option is set at OFF
from the factory.
NOTE
The parking brake must be set for the idle
cooldown function to work.
Engine Shutdown System (If
Enabled)
The engine is protected by a system that
prevents engine damage. The system
shuts down the engine whenever a
potentially damaging condition (such as
loss of oil pressure, loss of coolant or
engine overheating) is detected. If the
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