GEAR 7D8346 - Caterpillar

Introduction
The engine is designed for electronic control. The engine has an Electronic Control Module (ECM), a fuel injection pump and electronic unit injectors. All of these items are electronically controlled. There are also a number of engine sensors. The engine is equipped with an electronically controlled wastegate for the turbocharger. The ECM controls the engine operating parameters through the software within the ECM and the inputs from the various sensors. The software contains parameters that control the engine operation. The parameters include all of the operating maps and customer-selected parameters.
Illustration 1 g02420296
Typical example
(1) Air cleaner
(2) Air inlet temperature sensor
(3) Exhaust Cooler for the NOx Reduction System (NRS)
(4) Exhaust back pressure valve
(5) Diesel Oxidation Catalyst (DOC) and Diesel Particulate Filter (DPF)
(6) DPF inlet temperature sensor
(7) Soot sensor
(8) Turbocharger
(9) Valve for the NOx Reduction System (NRS)
(10) Temperature sensor for the NOx Reduction System (NRS)
(11) Inlet pressure sensor for the NOx Reduction System (NRS)
(12) Exhaust gas valve for the NOx Reduction System (NRS)
(13) Air-to-air aftercooler
(14) Wastegate regulator
(15) Outlet pressure sensor for the NOx Reduction System (NRS)
(16) Engine
(17) Coolant temperature sensor
(18) Crankshaft speed/timing sensor
(19) Electronic unit injectors
(20) Fuel cooler
(21) Fuel pressure relief valve
(22) Camshaft speed/timing sensor
(23) Fuel injection pump and fuel temperature sensor
(24) Fuel pressure sensor
(25) Oil pressure sensor
(26) Atmospheric pressure sensor
(27) ECM
(28) Fuel transfer pump
(29) Primary fuel filter
(30) Fuel strainer
(31) Inlet manifold pressure sensor
(32) Inlet manifold air temperature sensor
(33) Transfer pump inlet regulator
(34) Secondary fuel filter
(35) Fuel tank The electronic control system has the following components:
ECM
Pressure sensor
Temperature sensors
Crankshaft speed/timing sensor
Camshaft speed/timing sensor
The suction control valve for the fuel injection pump
Wastegate solenoid
Electronic unit injectors
Soot sensorsSensor Locations for the Engine
The illustrations in this section show the typical locations of the sensors for the industrial engine. Specific engines may appear different from the illustration due to differences in applications.
Illustration 2 g02417296
Typical example
(1) Coolant temperature sensor
(2) Wastegate regulator
(3) Throttle valve
(4) Fuel pressure sensor
(5) Inlet manifold temperature sensor
(6) Boost pressure sensor
(7) Electronic Control Module (ECM)
(8) Atmospheric pressure sensor
(9) Primary speed/timing sensor
(10) Oil pressure sensor
(11) Electric fuel transfer pump
(12) Water in fuel switch
(13) Fuel temperature Sensor
(14) Suction control valve for the fuel injection pump Note: The location of the secondary fuel filter, the primary fuel filter, and the fuel priming pump will depend on the application.
Illustration 3 g02417316
Typical example
(15) Inlet pressure sensor for the NOx Reduction System (NRS)
(16) Outlet pressure sensor for the NOx Reduction System (NRS)
(17) Exhaust gas valve for the NOx Reduction System (NRS)
(18) Temperature sensor for the NOx Reduction System (NRS)
(19) Back pressure valve
(20) Secondary speed/timing sensor
Illustration 4 g02394156
Typical example
(1) Coolant temperature sensor
(2) Wastegate regulator
(3) Throttle valve
Illustration 5 g02417317
Typical example
(4) Fuel pressure sensor
(5) Inlet manifold temperature sensor
(6) Boost pressure sensor
(7) Electronic Control Module (ECM)
(8) Atmospheric pressure sensor
(9) Primary speed/timing sensor
(10) Oil pressure sensor
(11) Electric fuel transfer pump
Illustration 6 g02417337
Typical example
(12) Water in fuel switch
(13) Fuel temperature sensor
(14) Suction control valve for the fuel injection pump
Illustration 7 g02417338
Typical example
(15) Inlet pressure sensor for the NOx Reduction System (NRS)
(16) Outlet pressure sensor for the NOx Reduction System (NRS)
(17) Exhaust gas valve for the NOx Reduction System (NRS)
(18) Temperature Sensor for the NOx Reduction