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OPTION AR-LINKAGE 3966774 - Caterpillar

3966774 OPTION AR-LINKAGE Caterpillar parts 314D LCR
Alternative (cross code) number:
Caterpillar 3966774 OPTION AR-LINKAGE

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EXCAVATOR  314D LCR   Caterpillar
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Engine Information
These Caterpillar Engines provide the following features:
Four stroke cycle
Electronic engine control
Direct injection fuel system
Mechanically actuated electronic unit injectors
Air-to-air aftercoolerEngine Specifications
Note: The front end of the engine is opposite the flywheel end of the engine. The left side and the right side of the engine are determined from the flywheel end. The number 1 cylinder is the front cylinder.
Illustration 1 g00284836
Cylinder and valve locations
(A) Inlet valves
(B) Exhaust valves
Table 1
C13 Engine Specifications
Cylinders and Arrangement In-line six cylinder
Bore 130 mm (5.1 inch)
Stroke 157 mm (6.2 inch)
Displacement 12.5 L (759.9 cubic inch)
Firing Order 1-5-3-6-2-4
Rotation (flywheel end) Counterclockwise Electronic Engine Features
These Caterpillar Engines are designed for electronic controls. These engines have an integral on board computer that is called an Electronic Control Module (ECM). The ECM monitors current engine conditions and power requirements. The optimum engine response is calculated and instructions are sent to the engine control systems. The systems respond and the engine responds accordingly. Total engine control is realized through the control of the fuel system and the engine speed/timing system. The electronic engine control system provides the following features:
Engine speed governing
Injection timing control
Automatic air/fuel ratio control
Torque rise shaping
Engine monitoring and protectionThe ECM provides the electronic governing of fuel delivery in order to dictate the following engine controls: engine speed setpoint, engine timing accuracy, air/fuel ratio control and torque rise fuel setting.Electronically controlled, mechanically actuated unit injectors combine several elements of the fuel system into a single unit. Elements within the single unit include: pumping, electronic fuel metering (duration and timing) and injecting. Each cylinder has an independent unit injector.Fuel metering is controlled by an electrical signal that is sent to the injector solenoid from the ECM. Very high fuel injection pressures are produced by the unit injector pump. High injection pressures and accurate fuel metering ensure good fuel atomization and thorough combustion. This state-of-the-art technology provides the engine with the following benefits: reduced fuel consumption, controlled smoke emissions and electronically controlled acceleration ramp rates.The engine timing control and speed control are provided by the ECM. The speed/timing circuit consists of two speed/timing sensors. During engine cranking, the ECM uses the timing signal from the secondary speed/timing sensor. The timing signal from the primary speed/timing sensor is used by the ECM while the engine speed is greater than cranking speed. Utilizing two sensors for this circuit has several advantages. Each of the speed/timing sensors is treated as a discrete component by the ECM. If the signal from one of the sensors becomes suspect the ECM will use the signal from the other sensor in order to keep the engine operational.Injection duration is also managed by the ECM. The duration of the fuel injection cycle determines the engine speed. The placement of the injection cycle in relation to the crankshaft position will determine the timing advance. The speed/timing circuit provides information to the fuel cooled ECM for detection of crankshaft position and engine speed. This information is utilized by the ECM in order to control desired engine speed and

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