SOLENOID AS 3E7507 - Caterpillar

The brushless generator is used for various marine applications. The elimination of brushes in the field circuit reduces maintenance with increased reliability. Also, the elimination of brushes provides a higher degree of protection in potentially hazardous atmospheres. The generator set packages can be utilized for prime power generation or standby power generation. The generators can be configured for three-phase power or single-phase power. The generators have full-wave excitation and regulation. The generators have 12 leads that can be connected in various configurations. The generators may produce electrical power in either 50 Hz or 60 Hz applications.The engines are powered with direct fuel injection. A mechanical governor controls the fuel injection pump output. Engine speed is controlled by the electronic speed control. In the event of a malfunction with the electronic speed control, the mechanical speed control will prevent an engine overspeed condition and resulting in mechanical damage.Fuel is metered and pumped by the fuel injection pump under high pressure to the fuel injection nozzles (one per cylinder). The automatic timing advance provides the best fuel injection timing over the full range of engine speed.The cooling system consists of the following components:
A centrifugal pump that is driven by a gear
One water temperature regulator which regulates the engine coolant temperature
Heat exchanger for the closed water circuit
Auxiliary water pump
Expansion tank
Radiator (If equipped)The engine lubricating oil is supplied by a gear type pump. The engine lubricating oil is cooled on models that are equipped with the optional oil cooler. Bypass valves provide unrestricted flow of lubrication oil to the engine parts when oil viscosity is high. Bypass valves can also provide unrestricted flow of lubrication oil to the engine parts if the oil cooler should become plugged or 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 the Operation and Maintenance Manual, "Maintenance Interval Schedule" for more information on maintenance items.Engine Specifications
Note: The front end of the engine is opposite the flywheel end of the engine. The left and the right side of the engine are determined from the flywheel end. The No. 1 cylinder is the front cylinder.C4.4 Marine Generator Set Engine
Illustration 1 g01156157
(E) Exhaust valves
(I) Inlet valves
(R) Rear of the engine
(F) Front of the engine
Table 1
C4.4 Marine Generator Set Engine Specifications
Operating Range (rpm) 1500 to 1800(1)
Number of Cylinders 4 ( In-Line)
Bore 105.0 mm (4.13 inch)
Stroke 127.0 mm (5.00 inch)
Aspiration NA(2)
T(3)
TA(4)
Displacement 4 L (243 in3)
Firing Order 1, 3, 4, 2
Rotation that is viewed from the flywheel Counterclockwise
(1) The operating rpm is dependent on the engine rating and the application.
(2) Naturally Aspirated
(3) Turbocharged
(4) Turbocharged Aftercooled