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Loosen cam and set to break at this point. The adjusting screw on the cam must always be act down tight after
changing this adjustment.
The spark occurs the instant the timer contacts are open. In checking the timing, the cam should be held on
tension in the opposite direction of rotation so that all back lash is taken up when rotor button comes under No. I
contact on the distributor head.
After checking the timing, replace the rotor. Rub a little vaseline on the rotor track of the distributor head
before seeing that this is down tight in position.
The ignition coil is mounted on the dash, and serves to transform the low voltage in the primary circuit to a
high voltage in the secondary circuit.
The coil consists of a primary winding of coarse wire, wound around an iron core in comparatively few turns,
and a secondary winding of many turns of fine wire; also, the necessary insulation mid terminals for wiring
connections.
The coil is equipped with a safety spark gap device to insure against secondary break down, if a wire is
removed from a spark plug while the motor is running.
On the distributor is a "resistance unit," which is a coil of resistance wire wound on a porcelain spool.
Under ordinary conditions the wire remains cool and offers little resistance to the passage of current.
However, if the primary circuit of the ignition should remain closed for any considerable length of time
The Ignition Coil
57
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