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SPECIAL AR 3157384 - Caterpillar

3157384 SPECIAL AR Caterpillar parts SPECIAL
Alternative (cross code) number:
Caterpillar 3157384 SPECIAL AR

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Illustration 3 g02469938Fuel System for the Clean Emissions Module
Illustration 4 g02301233
Typical example
(A) Fuel from primary fuel filter
(1) Fuel pump for the ARD
(2) Fuel control manifold (ARD)
(3) Fuel pressure sensor
(4) ARD head
(5) Fuel line
(B) Fuel return to secondary fuel filter Fuel flows from the primary fuel filter/water separator to the ARD fuel pump (1). The ARD fuel pump (1) provides fuel for ARD head (4).Fuel pressure sensor (3) send a signal to the ECM. The signal indicates the fuel pressure inside the fuel control manifold (ARD) (2). The fuel is sent directly to the ARD head (4) from the fuel control manifold (ARD) (2).Excess fuel from the fuel pump for the ARD (1) is then returned to the secondary fuel filter.Air System for the Clean Emissions Module
Illustration 5 g02303496
Typical example
(1) ARD body
(2) ARD head
(3) Line for the combustion air
(4) Exhaust from turbocharger
(5) Low-pressure turbocharger
(6) Exhaust manifold
(7) High-pressure turbocharger
(8) ARD combustion air valve
(A) Exhaust air to DOC and DPF
(B) Compressed air to aftercooler Exhaust Air
Exhaust air flows from the turbine housing to the ARD body. The exhaust air then flows through the Diesel Oxidation Catalyst (DOC) and the DPF.Combustion Air
Pressurized air from the turbocharger flows to the combustion air valve. The combustion air valve controls the amount of air that is supplied to the ARD Head. The combustion air is used with the supplied fuel and the spark plug to create the flame.Cooling System
Two lines circulate coolant in the ARD head. The coolant is used to extend the life of the O-ring for the ARD nozzle.Electronic Controls
Illustration 6 g02304673
Typical example
(1) Soot Sensors
(2) Combustion air inlet pressure sensor
(3) DPF differential pressure sensor
(4) DPF inlet pressure sensor
(5) DPF inlet temperature sensor
(6) Fuel pressure sensor All electronic devices on the CEM are controlled by the engine ECM. The ECM sends signals in order to complete the following functions: sending fuel pressure to the ARD head, the ignition and the actuation of the heated nozzle.Sensors
Absolute Pressure Sensor ( combustion air valve) - This sensor determines the pressure of the combustion air in the combustion air valve.Absolute Pressure Sensor ( Exhaust Gas) - This sensor measures the pressure of the exhaust gases as they enter the DOC.Inlet Temperature Sensor - This sensor determines the temperature of the air that is entering the DOC and the DPF.Soot Sensors - The Soot Sensors use a radio frequency to determine the amount of soot in the DPF. The Soot Sensors use a coaxial cable in order to send a signal to a control box that is mounted on the machine. The control box conditions the signal. Then, the control box sends a value to the engine ECM, which converts the value to a soot level.Fuel Pressure Sensor - The sensor determines the pressure of the fuel that is being supplied to the ARD Head.Flame Detection Temperature Sensor - This sensor determines if a flame is present.Heated Nozzle
The orifice for the fuel creates a high amount of atomization of the fuel for ignition and operation.
Illustration 7 g02304633
Typical example
(1) Coolant inlet
(2) Coolant outlet
(3) Heated Nozzle

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