Figure 8A-13. Engine Timing Marks
Figure 8A-14. Magneto Adjustment Limits
b. At this point, the engine is ready for assembly of the magnetos. Remove the inspection plugs from
both magnetos and turn the drive shafts in direction of normal rotation (counterclockwise facing the
coupling), until the first painted chamfered tooth on the distributor gear is aligned in the center of the
inspection window. (Refer to Figure 8A-15.) Being sure that the gear does not move from this
position, install gaskets and magnetos on the engine. Secure with washers and nuts; tighten only finger
tight.
NOTE
The magnetos are held in place by clamps which allows them to be timed in
several positions. Since all positions will not give the required clearance
between magneto and engine mount, the magnetos must be installed from
the horizontal position to 20° above the horizontal as shown in Figure 8A-
14. Improper installation of magnetos could cause damage or failure.
NOTE
In order to turn the shaft on an impulse coupling magneto, depress pawl on
the impulse coupling with the finger.
c. Using a battery powered timing light, attach the positive lead to a suitable terminal connected to the
ground terminal of the magneto and the negative lead to any unpainted portion of the engine. Rotate
the magneto in its mounting flange to a point where the light comes on, then slowly turn it in the
opposite direction until the light goes out. Bring the magneto back slowly until the light just comes on.
Repeat this with the second magneto.
NOTE
AC timing lights operate in the reverse manner as described above; the light
goes out when the breaker points open.
Revised: 8/31/77
2D17
CHEROKEE ARROW III SERVICE MANUAL
POWER PLANT - LYCOMING
Summary of Contents for ARROW III
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