Adjustments; Reluctor-To-Pick-Up Coil Air Gap; Ignition Timing - Mazda 1983 RX7 Service Manual

As each tooth passes the leading pick-up coil, the previous
passing tooth approaches and becomes aligned with the trailing pick-up
coil. This triggers a signal to the trailing ignitor, which breaks the
primary circuit in the trailing ignition coil.
Therefore, immediately after the leading spark plug fires,
the trailing spark plug also fires, providing more complete and
efficient combustion while reducing HC and CO emissions.
As the primary circuit is broken in the leading and trailing
ignition coils, a voltage surge occurs in the secondary circuit of
the ignition coils. This high voltage is transmitted through the
leading and trailing high tension wires to the distributor, rotor and
spark plugs.
An emission control unit is also included in the ignition
control system, along with different sensing switches to provide
proper timing under varying engine operating conditions.

ADJUSTMENTS

RELUCTOR-TO-PICK-UP COIL AIR GAP

1) Remove distributor cap and rotor. Turn distributor shaft
until the extended tooth of the reluctor (signal rotor) aligns with
core of pick-up coil. See Fig. 2.
2) Using a feeler gauge, check for .020-.035" (.5-.9 mm) air
gap. If gap is incorrect, replace pick-up coil and bearing assembly
or distributor drive shaft, if necessary.
Fig. 2: Adjusting Distributor Air Gap
Check air gap at all teeth and both pick-up coils.

IGNITION TIMING

1) To adjust leading timing, loosen distributor lock nut,
and rotate distributor housing until correct timing is obtained. See
IGNITION SYSTEM
Article Text (p. 2)
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Sunday, August 26, 2001 03:31PM