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OM-2049
(10) Spark arrester muffler
This muffler prevents the discharge of sparks from the engine's exhaust.
C. Generator
The generator (15, Figure 3) is a multi-phase, synchronous salient pole, revolving field, AC generator
whose output is rectified. The output is recitified by a rectifier assembly (9) made up of twelve rectifi-
ers connected into a full wave configuration. The generator is self-excited and receives excitation from
a three phase full wave rec-tified stator winding. One positive and one negative brush in contact with
slip rings supply controlled excitation current from the stator winding through the voltage regulator to
the rotating field winding. The voltage regulator controls the excitation current and maintains a con-
stant output voltage. Access to the brushes is through holes in the anti-drive end bracket.
The rotor is supported at the anti-drive end (slip ring end) by a single-row ball bearing. The drive end
is connected to the engine fly-wheel by a flexible disc and hub coupling assembly and is supported by
the engine main bearings. A radial-blade fan of formed sheet metal construction is mounted on the
coupling hub and draws cooling air over the rectifier assembly and generator windings.
Air enters through the anti-drive end of the generator and is discharged through openings in the fly-
wheel housing at the drive end. The generator housing assembly, which contains the generator sta-
tor, is bolted to the engine flywheel housing.
D. Control Panel Assembly
(1) General
The control panel (1, Figure 3) is a sheet metal panel which houses and provides mounting facili-
ties for controls and monitoring instruments. The panel is mounted at the rear of the canopy. Its
control are accessible behind a hinged Plexiglas cover. A small hinged panel (Figure 4) provides
mounting for the starting current potentiometer, and also provides access to the voltage regulator
and overvoltage relay, etc.
(2) Lights
Two panel lights (7, Figure 4) provide illumination for instruments and controls. One green pilot
light (12) glows when the output load contactor is closed, and another one (14) glows green when
the engine is running.
(3) Monitoring instruments
The voltmeter (6, Figure 4) indicates generator output voltage, and the ammeter (5) displays gen-
erator current.
A tachometer (2) displays the engine speed in RPM. This instrument is operated by pulses from
the distributor.
A water temperature gauge (3) indicates the engine coolant temperature and is actuated by a tem-
perature sender (11, Figure 3) mounted on the engine's water jacket.
An oil pressure gauge (1, Figure 4) displays the pressure in the engine's lubrication system. It is
operated by a sender (11, Figure 3) mounted on the engine block.
The ammeter (20, Figure 4) indicates the rate of charge or discharge in the engine's 12 volt DC
electrical system.
The hourmeter (15) records the total hours of engine operation for scheduling maintenance.
(4) Potentiometer
1-1
Page 8
May 20/89
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