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TM 55-1905-223-24-4
Table 1-1. Equipment Data
Characteristics
Reference Data
Model
4BT3.9GC
Manufacturer
Cummins Engine Co., Inc.
Type
4 cycle, 4 cylinder, diesel
Aspiration
Turbocharged
Rating
60 Hz, 240 V, 40 kW, 3 phase
at 1800 rpm
3.92 liters (239.3 in3)
Displacement
Bore and Stroke
102(4.02) x 120(4.72)
Weight
1514 lbs
Compression Ratio
18.5:1
Section III. PRINCIPLES OF OPERATION
Overview. The principles of operation section will give you overall description of how the emergency
generator set works. Keep in mind that proper engine operation depends on two things: 1) compression
for ignition, and 2) that fuel be measured and injected into cylinders in the proper quantity at the proper
time.
1-10. Generator. The diesel engine is an internal combustion power unit, in which the heat of fuel is converted into work
in the cylinder of the engine. Air alone is compressed in the cylinder. After the air has been compressed, a charge of
fuel is sprayed into the cylinder and ignition is accomplished by the heat of the compression. The engine is electric
started. The starting motor is energized by a storage battery. The generator function is to transform mechanical energy,
supplied by the engine, into electrical energy. The following is a brief summary of the main generator components.
a. Right Hand Door Assembly. The right side door assembly of the emergency generator set contains the buttons
and indicators necessary for manual operation and monitoring of the set. As conditions are indicated at this assembly,
manual intervention of functions or repair may be obtained. This assembly consists of the the following:
(1)
Time totalizing meter. Records the total generator set hours.
(2)
Coolant temperature gauge. Indicates engine coolant temperature.
(3)
Pressure indicator. Indicates engine oil pressure.
(4)
Fault lamp. Lights to indicate a fault condition has occurred.
b. Automatic Transfer Switch. This automatically transfers the electrical load from the normal source of energy to
the emergency generator set when power failure occurs. It also transfers the load back when power is returned to normal
load.
1-4

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