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What is the purpose of
the Ignition System? Answer No. 53
It furnishes the electric spark which explodes the charge in the combustion
chamber, thus producing the power which runs the engine. It is important that
the charge be correctly ignited at the proper time, in order to obtain satisfactory
results in running the car. In the Ford car the ignition system is as simple
as it is possible to make it.
How does the Magneto
generate the current? Answer No. 54
In revolving at the same rate of speed as the motor, the magnets on the flywheel
passing the stationary coil spools create an alternating low tension electric
current in coils of wire which are wound around spools fastened to the stationary
part of the magneto, and is carried from these coils to the magneto connection
(wire) leading to the coil box on the dash.
Should the Coil Vibrator
Adjustment be disturbed? Answer No. 55
The present style of coil unit is properly adjusted when it leaves the factory
and this adjustment should not be disturbed unless to install new points. When
adjustments are necessary they should, whenever possible, be made by one of
our service stations who have special equipment for testing and adjusting units
and will gladly furnish expert service. If the points are pitted they should
be carefully smoothed with an oilstone or file and the adjusting thumb nut
turned down so that the gap between the vibrator and the core of the unit will
be a trifle less than 32" of an inch. Then set the lock nut so that the
adjustment can not be disturbed. Do not bend or hammer on the vibrators, as
this would affect the operation of the cushion spring of the vibrator bridge
and reduce the efficiency of the unit.
How is a Weak Unit detected?
With the vibrators properly adjusted, if any particular cylinder fails or seems
to develop only a weak action, change the position of the unit to determine
if the fault is actually in the unit. The first symptom of a defective unit
is the buzzing of the vibrator with no spark at the plug. Remember that a loose
wire connection, faulty spark plug, or worn commutator may cause irregularity
in the running of the motor. These are points that should be considered before
laying the blame on the coil.
How may short circuit in Commutator Wiring be detected?
Should the insulation of the primary wires (running from coil to commutator)
become worn to such an extent that the copper wire is exposed —the current
will leak out (i. e., short circuit) whenever contact with the engine pan or
other metal parts is made. A steady buzzing of one of the coil units will indicate
a "short" in the wiring. When driving the car the engine will suddenly
lag and pound on account of the premature explosion. Be careful not to crank
the engine downward against compression when the car is in this condition,
as the "short" is apt to cause a vigorous "back kick."
[25]
Answer No. 56
Answer No. 57