Perkins 1204F-E44TA Operation And Maintenance Manual page 30

30
Product Information Section
Product Description
The ECM provides an electronic governor that
controls the injector output in order to maintain the
desired engine rpm.
Engine Cooling and Lubrication
The cooling system and lubrication system consists
of the following components:
• Gear-driven centrifugal water pump
• Water temperature regulator which regulates the
engine coolant temperature
• Gear-driven rotor type oil pump
• Oil cooler
The engine lubricating oil is supplied by a rotor type
oil pump. The engine lubricating oil is cooled and the
engine lubricating oil is filtered. The bypass valve can
provide unrestricted flow of lubrication oil to the
engine if the oil filter element should become
plugged.
Engine efficiency, efficiency of emission controls, and
engine performance depend on adherence to proper
operation and maintenance recommendations.
Engine performance and efficiency also depend on
the use of recommended fuels, lubrication oils, and
coolants. Refer to this Operation and Maintenance
Manual, "Maintenance Interval Schedule" for more
information on maintenance items.
Aftertreatment System
The aftertreatment system is approved for use by
Perkins. In order to be emission-compliant only the
approved Perkins aftertreatment system or approved
components must be used on a Perkins engine.
Clean Emission Module (CEM)
The function of the CEM is to ensure that the engine
exhaust meets the required emissions regulation for
the country of operation.
There are two configurations of the CEM.
• Diesel Oxidation Catalyst (DOC) and Selective
Catalytic Reduction (SCR)
• Diesel Oxidation Catalyst (DOC) Diesel
Particulate Filter (DPF) and Selective Catalytic
Reduction (SCR)
For the DOC and SCR aftertreatment configurations
the CEM is comprised of three main components:
The Diesel Oxidation Catalyst (DOC), the mixer and
the Selective Catalytic Reduction Catalyst (SCR).
The engine is connected by a flexible pipe to the
CEM. The exhaust gases pass through the DOC and
then the mixer where the gases are mixed with the
injected urea. The mixture then enters the SCR
catalyst. Here the NOx in the exhaust reacts with the
ammonia from the injected urea to split the gases into
nitrogen and oxygen constituents. The SCR catalyst
includes an ammonia oxidation section (AMOX) to
clean up any remaining ammonia before the gases
exit the system.
For the DOC, DPF and SCR aftertreatment
configurations the CEM has four main components
again: DOC and Diesel Particulate Filter (DPF) in the
first unit, the mixer, and the SCR.
In this instance the only differences to the operation
described above is that the particulate matter soot
and ash are trapped by the DPF. A passive
regeneration process is used to ensure that normal
operation of the engine removes the soot. The ash
remains in the DPF and must be removed at an
engine overhaul.
Cooling and Purging of the DEF Lines
After key-off, the DEF pump will circulate the DEF
fluid for a given time, in order to cool the DEF injector.
Also, the DEF pump will purge the DEF system of
fluid to protect the system from freeze of the DEF
fluid in cold conditions.
With the DOC and SCR aftertreatment system the
cooling and purging will take a minimum of 3 minutes
and a maximum of 10 minutes. The time taken will
depend on the temperature with the aftertreatment
system.
When the DOC, DPFand SCR system is operating
with exhaust gas temperatures below 425° C
(797° F) before key-off, the cooling and purging will
also take 6 minutes When the DOC, DPF, and SCR
aftertreatment system operates at temperatures
above 425° C (797° F), and key-off occurs the
cooling and purging will take a maximum of 15
minutes.
For example, the maximum cool-down and purge
time is only likely to be encountered in a certain
combination. Full-load rated speed operation and the
DPF in a regeneration mode occurring
simultaneously, immediately before key-off.
Service Life
Engine efficiency and maximum utilization of engine
performance depend on the adherence to proper
operation and maintenance recommendations. In
addition, use recommended fuels, coolants, and
lubricants. Use the Operation and Maintenance
Manual as a guide for required engine maintenance.
SEBU9063-07