Engine Operation
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Engine Operation
Proper operation and maintenance are key factors in
obtaining the maximum life and economy of the
engine. If the directions in the Operation and
Maintenance Manual are followed, costs can be
minimized and engine service life can be maximized.
The time that is needed for the engine to reach
normal operating temperature can be less than the
time taken for a walk-around inspection of the
engine.
The engine can be operated at the rated rpm after
the engine is started and after the engine reaches
operating temperature. The engine will reach normal
operating temperature sooner during a low engine
speed (rpm) and during a low-power demand. This
procedure is more effective than idling the engine at
no load. The engine should reach operating
temperature in a few minutes.
Gauge readings should be observed and the data
should be recorded frequently whilst the engine is
operating. Comparing the data over time will help to
determine normal readings for each gauge.
Comparing data over time will also help detect
abnormal operating developments. Significant
changes in the readings should be investigated.
If a Diesel Particulate Filter (DPF) equipped
aftertreatment system are installed, avoid excess
idling. Excessive idling causes soot loading of the
DPF. Also, excessive idling will create carbon buildup
and engine slobber. These issues are harmful to the
engine.
Reduction of Particulate Emissions
Two different types of aftertreatment systems are
available.
• Diesel Oxidation Catalyst (DOC) and Selective
Catalytic Reduction (SCR)
• Diesel Oxidation Catalyst (DOC) Diesel
Particulate Filter (DPF) and Selective Catalytic
Reduction (SCR)
On DOC and SCR aftertreatment system particulate
emissions are reduced during combustion and so
there is no soot or ash stored in the aftertreatment.
Also, there is no regeneration event to consider.
On DPF equipped aftertreatment system the DPF will
reduce particulate emissions. The DPF collects the
soot and any ash that is produced by the combustion
in the engine. During regeneration, the soot is
converted into a gas which is released into the
atmosphere. The Ash remains in the DPF.
The temperature of the DPF must be above a
particular value in order for regeneration to occur.
The exhaust gas provides heat for the regeneration
process.
Passive Regeneration – The engine provides
sufficient exhaust gas temperature for regeneration.
Passive regeneration will only be performed on
aftertreatment systems that have a DPF installed.
Passive regeneration is the process that is used by
the DPF to remove soot from the DPF. In some
applications, the engine idle speed will automatically
be increased to allow passive regeneration to occur.
During passive regeneration, the back pressure valve
is used to increase exhaust back pressure. This
increase in pressure is to raise exhaust temperatures
so that the aftertreatment system can regenerate
efficiently.
During operation of the back pressure valve, trace
amounts of exhaust gas may escape from the
connections in the exhaust system.
Elevated Idle for Aftertreatment
Continuous low load operation may lead to the
elevation of engine low idle speed to 1200
Revolutions Per Minute (RPM). The elevation of
engine low idle speed is part of the aftertreatment
management. The engine will only elevate low idle
when required and safety interlocks are in place. The
engine can continue to be operated as normal.
Operating the engine for longer periods at higher
load will reduce the use of this elevated idle mode.
Constant speed engines and engines with an idle
speed at or above 1200 RPM will not require the
increase in idle speed.
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Engaging the Driven
Equipment
1. Operate the engine at one-half of the rated rpm,
when possible.
2. Engage the driven equipment without a load on the
equipment, when possible.
SEBU9063-07
73
Operation Section
Engine Operation
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