Carrier 69UG15 manual Engine Screw Threads

1.3 ENGINE

The engine is a vertical, in--line four cylinder diesel engine, which is direct--connected to the alternating current generator. Information on the major engine systems is provided in the following subparagraphs.

1.3.1 Electronic Governor Module

The electronic governor module is a solid state control module preprogrammed for 1800 RPM. The electronic governor module, along with the engine speed sensor, replaced the manual governor in order to provide a constant engine speed.

1.3.2 Engine Air System

The air cleaner (Item 11, Figure 1-1) is designed to prolong engine life and performance by preventing dirt and grit from entering the engine and causing excessive wear on all operating parts. In order for the air filter to operate properly, the operator must regularly maintain the air cleaner equipment in accordance with the instructions provided within this document.

1.3.3 Lube Oil Filter Arrangement

The engine lubricating oil filter is mounted in a horizontal arrangement and shown in Figure 1-4.

1.3.4 Fuel System

The fuel system is fitted with an in--line pre--filter and a fuel filter, which also acts as a water separator. The filter is also fitted with a heater. The fuel system is shown in Figure 1-3.

1.4 ENGINE SCREW THREADS

All threads used on the engine are metric.

	8
9
	6
	5
4	7
2
3
1

1.	Fuel Tank	5.	Fuel Filter and Water
2.	Fuel Supply Line		Separator
3.	Inline Fuel Filter	6.	Injection Pump
4.	Mechanical	8.	Fuel Bleed Valve
	Fuel Pump (Engine)	7.	Injector Nozzles
		9.	Fuel Return Line

Figure 1-3 Fuel System Diagram

1	2
	3
4

1.Oil Filter (Primary)

2.Oil Pressure Sender

3.Oil Pressure Switch

4.Oil Pan

Figure 1-4 Lube Oil

1.5 ALTERNATING CURRENT GENERATOR 1.5.1 Principle of Operation

The Marathon Alternator Company (Lima) brushless AC generator (see Figure 1-2, item 9) is a self--regulated, rotating field synchronous unit. The generator stator and exciter stator are combined in a common housing. The generator field, exciter rotor, and rotating rectifier assembly are mounted on a common shaft. The output of the exciter rotor is applied to the generator field winding through a rotating, full--wave bridge, silicon rectifier unit.

All connections between the exciter stator windings and the generator stator windings are internal within the stator housing. Only the output power leads are connected at the terminal box, which is located on top of the generator.

1.5.2 Alternating Current Generator Diagram

Figure 1-5 shows the internal schematic diagram of the generator, exciter, and rectifier unit. The generator is a three--phase unit, and the exciter stator and exciter rotor also have three--phase windings. A portion of the exciter stator windings is connected across a tap on the generator stator winding. This exciter shunt winding provides the generator field excitation power required for the generator no--load voltage. Another portion of the exciter stator windings is connected in series with the output of the generator and provides a compounding excitation characteristic.

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