Royal Enfield CO, Руководство по техническому обслуживанию мастерской

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ROYAL ENFIELD 350cc O.H.V. WORKSHOP MANUAL
Page 36
79. Test of Armature.
The testing of the armature requires the use of a
volt drop test or "growler." If these are not available,
check by substitution.
80. Special attention required if water has
entered Dynamo.
(1) Check fibre wedges located in armature core
slots. These may have swollen and become
proud of the core. Cut level with sharp knife.
(2) Thoroughly dry out field coils and brushgear.
(3) Remove drive end ballrace. Wash out and if
no excessive wear or roughness is apparent,
re-pack with high melting point grease.
81. Reassembly of Dynamo.
(1) Pack drive end bearing with high melting
point grease. Refit bearing retaining plate.
(2) Fit armature into drive end bearing and secure
by screwing the retaining ring up tightly.
(3) Pass coil leads through slot provided on
commutator end bracket insulating plate.
(4)
Fit commutator end bracket in position on
dowel pins.
(5)
Lightly smear commutator end of armature
shaft with oil and fit armature and drive end
bracket into the yoke.
(6)
Refit through bolts with cupped washers under
drive end and flat spring washers under
commutator end.
(7)
Fit brushes into boxes and connect up brush
tags with lead to "D" terminal and lead from
"F" under their appropriate screws. The
brushes are pre-formed and do not need
bedding to the commutator.
(8)
Reconnect wires to terminals "D" and "F" on
bakelite cover, making absolutely sure that
the correct wires are fitted to the respective
terminals.
(9) To test-run the dynamo as a motor by
connecting the + terminal of a 6 volt Battery
to the "D" terminal of the dynamo and the
terminal of the battery to the dynamo yoke.
Bridge terminals "D" and "F" with a piece of
wire. The dynamo should then commence to
rotate slowly.
Remove the link at "F" terminal when an
increase in the speed should be observed.
Reconnection of, the link between "F" and
"D" should slow down the speed again.
(10) Refit cover band, taking particular care to see
that the top half overlaps the bottom and the
cork gasket is correctly in place. Ascertain
from the position of the magdyno which side
faces the rear of the motor cycle and bring
joining band to this side. This procedure is
most important to prevent water entering
dynamo.
REGULATOR AND CUTOUT.
(Lucas Model MCR1, Type L33).
82. Description.
The regulator provides complete automatic
control causing the dynamo to give an output which
varies according to the load on the battery or its state
of charge. Normally, during daytime running, when
the battery is in good condition, the dynamo gives
only a trickle charge, so that ammeter readings will
seldom exceed 1 or 2 amperes. If, under normal
running conditions, it is found that the battery is
continually in a low state of charge, or is being
overcharged, then the regulator should be adjusted.
Always check that the "D" lead (yellow) and "F"
lead (green and black) between the regulator and
battery are connected to their correct terminals at
both ends.
83. Adjustment.
The checking and adjustment of the regulator
necessitates the use of a moving coil voltmeter
having a full scale reading of approximately 12 volts.
To check the setting, disconnect the cable from
the "A" terminal of the regulator and connect the
voltmeter between the "D" terminal of the regulator
or the regulator frame and some metal part of the
engine.
Start the engine and increase the speed until the
voltmeter needle "flicks" and then steadies. This
reading should occur between the following limits:
At 30°F. between 7.9 and 8.3 volts.
At 60°F. between 7.8 and 8.2 volts.
At 90°F. between 7.7 and 8.1 volts.
If the voltage at which the reading becomes steady
occurs outside the limits the regulator must be
adjusted.
Stop the engine, release the locknut holding the
adjusting screw (see Fig. 58) and turn the screw in a
clockwise direction to raise the setting or in an
anticlockwise direction to lower the setting. Turn the
adjustment screw a fraction of a turn and then tighten
the locknut.
When adjusting, do not run the engine up to more
than half throttle as while the dynamo is on open
circuit it will build up to a high voltage if run at high
speed and so a false voltmeter reading will be
obtained.
84. Cleaning Contacts.
After a long period of service, it may be found
necessary to clean the vibrating contacts of the
regulator. These are accessible if the top screw
carrying the fixed contact is removed and the bottom
screw slackened to enable the fixed contact to be
swung outwards. The contacts should then be cleaned
by polishing with a fine carborundum stone.
85. Mechanical Setting.
The contacts are accurately set during assembly
and normally should not be disturbed. In the event of
it becoming necessary to reset the contacts, however,
the following procedure should be adopted :
Insert .015 in. feeler gauge between the back of
the armature and the regulator frame.
Insert .020 in.-.025 in. feeler gauge between the
top of the bobbin core and the underside of the
movable armature (not under the stop rivet).
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