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28
FORD MODEL A
ELECTRICAL
SYSTEM
The
electrical
system includes the following equipment:
Storage
Battery
Generator
Starting
Motor
Distributor
Ignition
Coil
Spark Plugs
Ammeter
Horn
Lamps
Windshield Wiper
Engine Ignition
The current
for igniting the gas mixture in the cylinders is
provided by the storage battery.
The ignition coil transforms
the low tension cw-rent to a high tension current of sufficient
\/oltage to jump between the points of the spark plugs. The
distributor
breaker points interrupt
the flow of low tension cur-
rent at
regular
intervals, while the distributor
rotor distributes
the high tension current
to each spark plug in proper firing
order.
Adjusting
Breaker Contact
Points
The gap between the breaker points is set at
.018 to
.022n.
The gap should occasio ally be checked
to
see
that
the points
are properly adjusted.
If
the points are burnt or pitted they should be dressed down
with an oil stone.
Do not
use a file.
To adjust the poin s proceed as
follows:
Lift off distributor
cap,
rotor, and body.
Tum engine over
slowly
with starting
crank until
breaker
arm rests on one of
the four
high points of the cam
with
the
breaker points fully
opened.
Loosen
lock screw
and
tum
the
contact screw until
the
gap
is between .O
18
and .
02 2
•.
A standard
thickncs
gauge is
used
to
obtain this measurement.
Ignition
Timing
As the spark
must occur at the end of the compression
stroke the timing must be checked from that point. To find
the compression stroke and time the spark proceed as follows:
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