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RING BACK UP 3C8635 - Caterpillar

3C8635 RING BACK UP Caterpillar parts
Alternative (cross code) number:
Caterpillar 3C8635 RING BACK UP
Weight: 0.26 pounds 0 kg.

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Fuel System Electronic Control Circuit
Illustration 2 g01386390
Electronic governor (Typical example) (1) Signals to the electronic unit injectors (2) Fuel injection control (3) Fuel position (4) Electronic governor (5) Desired rpm (6) Coolant temperature (7) TC for No. 1 cylinder (8) FRC fuel position (9) Rated fuel position (10) FCR maps (11) Torque maps (12) Engine speed/timing sensor (13) Engine speed/timing signals' interpreter (14) Engine rpm (15) Coolant temperature sensor (16) Boost pressure sensor (17) Boost pressureThe injection pump, the fuel lines, and the nozzles that are used in the traditional Caterpillar diesel engines have been replaced with an electronically controlled, mechanically actuated electronic unit injector in each cylinder. A solenoid on each injector controls the amount of fuel that is delivered by the injector. An Electronic Control Module (ECM) sends a signal to each injector solenoid in order to provide complete control of the engine.Fuel Injection
The ECM controls the amount of fuel that is injected by varying the signals that are sent to the injectors. The ECM sends a high voltage signal to the solenoid in order to energize the solenoid. The injectors will inject fuel only while the injector solenoid is energized. By controlling the timing and the duration of the voltage signal, the ECM can control injection timing and the amount of fuel that is injected.The ECM sets certain limits on the amount of fuel that can be injected. "FRC" is a limit which controls the amount of air and of fuel for the purpose of emission control. This limit is based on the boost pressure. When the ECM senses a higher boost pressure, the ECM increases the "FRC" limit. "Rated Fuel Pos" is a limit that is based on the horsepower rating of the engine. This is similar to the rack stops and to the torque spring on a mechanically governed engine. "Rated Fuel Pos" provides horsepower and torque curves for a specific engine family and for a specific engine rating. All of these limits are programmed into the personality module by the factory. These limits are not programmable by the service technician.Injection timing depends on three factors: the engine speed (rpm), the engine load and the operational conditions of the engine. The ECM determines the top center position of No. 1 cylinder from the signal that is provided by the engine speed/timing sensor. The ECM decides when the injection should occur relative to the top center position. The ECM then provides the signal to the electronic unit injector at the desired time.Electronic Unit Injector Mechanism
Illustration 3 g01292749
Electronic unit injector mechanism (Typical example) (1) Electronic unit injector (2) Adjusting nut (3) Rocker arm assembly (4) Camshaft lobeThe electronic unit injector mechanism provides the downward force that is required to pressurize the fuel in the electronic unit injector pump. The electronic unit injector (1) allows fuel to be injected into the combustion chamber with precise timing. Movement is transmitted from the camshaft lobe (4) for the electronic unit injector through the rocker arm assembly (3) to the top

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