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High idle speed is a nonadjustable factory setting. The high idle
setting depends on the application of the engine and has the
following ranges:
®
MaxxForce
DT: 2600 rpm through 2770 rpm
®
MaxxForce
9 and 10: 2325 rpm through 2425 rpm
EXTENDED IDLING PERIODS
CAUTION
To prevent engine damage, do not extend low idle
periods.
Idling periods over 15 minutes should be avoided. Diesel engine
efficiency is improved when the cylinder temperature remains
high. Low temperature in cylinders may cause the following:
•
Unburned fuel may seep from exhaust manifold gaskets
and vehicle exhaust system connections. This seepage
has the dark colored appearance of lubricating oil.
•
Incomplete combustion and unburned fuel washes
lubricating oil from cylinder sleeves.
will be carried into the lubricating oil, dilute the oil, and
change oil viscosity.
•
Carbon forms on internal components of turbochargers
and Exhaust Gas Recirculation (EGR), reducing engine
efficiency.
•
Carbon clogs and damages the Diesel Particulate Filter
(DPF).
Page 50
SECTION 4 – ENGINE OPERATION
EXHAUST AFTERTREATMENT SYSTEM
The
Aftertreatment System to capture soot and other particulates
before they exit the exhaust pipe. The soot is captured by the
Diesel Particulate Filter (DPF) and is periodically converted to
carbon dioxide (CO2) by a Regeneration (Regen) process.
The Regen process may take place during vehicle operation
(Active Regen). The Regen process will be triggered by either a
time-based or a soot mass buildup-based strategy.
A Parked Regen process occurs when a Moving Regen is not
possible, such as when there is not enough thermal energy for
Diesel Oxidation Catalyst (DOC) light off. The vehicle is parked
(stationary).
When a Regen is required,
Aftertreatment Fuel Injector (AFTFI) to inject fuel into the
exhaust system. A DOC oxidizes the injected fuel to increase
the exhaust gas temperature as needed for DPF Regen.
•
Unburned fuel
•
•
•
engine
and
vehicle
exhaust
the ECM commands the
A Parked Regeneration will be requested if the Passive
Regeneration cannot be completed during driving.
In this case, a lamp will be lit to alert the operator to
perform a Parked Regeneration.
The operator must park the vehicle and then perform the
Regen as required.
Follow the Parked Regeneration process listed in the
Vehicle Operator Manual.
piping
includes
an
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