Section II. EQUIPMENT DESCRIPTION AND DATA

TM 55-1905-223-24-4

Section II. EQUIPMENT DESCRIPTION AND DATA

1-6. General Description. The 4BT3.9GC emergency diesel generator set, illustrated in FIGURE 1-1, is a 4 cycle, 4

cylinder, radiator cooled unit. The generator is direct mounted to the engine for permanent alignment.. The in-line diesel

engine covered in this manual is equipped with standard accessories such as water pump, governor, fuel pump etc. Full

pressure lubrication is supplied to connecting rod, camshaft bearings and other moving parts. A gear-type pump draws

oil from the oil pan and delivers it to the oil filter. Coolant is circulated through the engine by a water pump. This is a

closed system with a radiator. Fuel is drawn from the fuel supply by a gear-type fuel pump. A turbocharger on top of the

manifold feeds air for combustion in the cylinders. Engine starting is provided by a starter motor which is energized by a

storage battery.

1-7. Characteristics, Capabilities, and Features. A very broad view of the emergency diesel generator is as follows:

a. Characteristics.

(1) Transfers mechanical energy, supplied by the engine, into electrical energy.

(2) Directly mounted to the engine for permanent alignment.

(3) Has control circuits that shut off the engine if an overspeed, high water temperature, or low oil pressure

develops.

b. Capabilities and Features.

(1) Turbocharger added to increase horsepower, by increasing the air intake into the combustion chambers.

(2) Provides automatic transfer of electrical load from normal source when power failure occurs.

(3) Auto control provides one way of starting the engine automatically if power fails.

1-8. Location and Description of Major Components. The emergency diesel generator and diesel engine are both on

a common chassis sub-base located on the center line of the ship, main deck, aft.

1-9. Equipment Data. Characteristics and reference data are provided in Table 1-1. Also see the equipment data

given in the operator's manual, TM 55-1905-223-10.

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