Austin SEVEN - Electrical Equipment; Cleaning Commutators and Brushes; Battery Attention; Dynamo; Starting Motor

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ELECTRICAL EQUIPMENT
Never fit any fuse other than the Lucas standard fuse as originally
fitted. The size of the fuse is marked on a coloured paper slip which can
be seen inside the fuse.
Cleaning Commutators and Brushes ;
Battery Attention
Starting Motor.
The commutator and brush gear are accessible on removing the sheet
metal band cover. The unit requires very little attention beyond keeping
the commutator clean and free from oil, brush dust, etc., as in the case of the
dynamo. Remember that although the starter will turn the engine over,
however stiff, It is advisable when cold, to crank the engine over by
hand for two or three revolutions ~s this will considerably diminish the
load for starting.
If the starter pinion jams in mesh with the flywheel ring when oper-
ating the starting motor switch, usually it can be released by putting the
gear lever into top gear, and moving the car bodily backward and forward.
If this plan is ineffectual the starter will have to be dismantled.
Never use the starting motor to propel the car, as it throws too severe
. strain on the battery and the motor.
If the engine does not start at the first attempt, do not press the
.tarter switch until the engine has come to rest. If this precaution is not
adopted, the starter ring teeth on the flywheel, or the starter pinion teeth,
may be damaged.
Switch Board
A key is provided by means of which the ignition switch is moved
so that the engine can be started. When the slot into which the key fits
is in a vertical position, the key may be withdrawn. The igmtion is then
cut off. To switch on the ignition, A
insert the key and turn to the right
until the slot is in a horizontal line.
The key cannot be withdrawn while
the ignition is switched on; it must
first be turned off and the slot be in
a vertical position.
The lighting and charging switch
positions are:- JII~"
" " .. '11Jl/IIIJ
Low Charge. -Dynamo gIVIng -r1
about half its normal output, V
"High Charge."- Dynamo giv- B
ing its full daytime output.
"Side."-Side Lamps and tail
lamp on.
T
HE lighting and starting units on the Austin Seven car are arranged
for wiring on the single wire system, one path of the current being
provided by the frame instead of a second wire. It is' therelore
essential that all units are in good metallic contact with the frame.
Should difficulties arise that cannot be understood or remedied
from the information given below, application should at once be made
to the Austin Service Department or the nearest service depot of the
makers of the equipment.
Dynamo.
The dynamo is a simple self-regulating third brush machine. The
only parts calling for any attention are the commutator and brushes,
which are readily accessible when the cover is removed.
The commutator surface must be kept clean and free from oil or
brush 'dust. It may be cleaned with ordinary soft rag, but if it has been
neglected use fine glass paper. Blow away any carbon dust, see that the
carbon brushes are wearing evenly and that they are free to slide in their
holders.
The dynamo bearings are packed with lubricant belore leaving the
works. When the car is overhauled, it is advisable to have the machine
dismantled and the bearings repacked with lubricant. This work is preler-
ably carried out at a Lucas Service Depot.
Dynamo Field Fuse.
A fuse is provided in the dynamo field circuit to protect the machine
in the event of anything being wrong in the charging circuit, e.g., a loose
or broken battery connection. The fuse is of the cartridge type and is
housed with the half charge resistance in the cut-out and fuse unit on the
engine side of the dash (see page 47).
If the dynamo fails to charge the battery at any time (indicated by a
discharge reading being given on the ammeter during daytime running)
inspect the fuse and if it has blown replace it with the spare fuse provided,
after inspecting the charging circuit wiring for loose or broken connections
and remedying. This fuse must not be replaced while the engine is
running. If the new fuse blows after starting up, the tause of the trouble
must be found, and we advise that the equipment is examined at one of
the Service Depots.
"Head."-Head Lamps, side
lamps, and tail lamp on.
c
The Dynamo
A-Bw,h S.dng, B-Bw.h.
C--commu","',
The dynamo automatically gives its full output when the headlamps
are switched on.
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