PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 4
Nov 30/06
5C10
74-10-00
WARNING: DO NOT ROTATE PROPELLER WHEN IGNITION SWITCH IS IN THE “ON”
POSITION. THE MAGNETOS WILL FIRE THE SPARK PLUGS IF THE
PROPELLER IS ROTATED - FATAL INJURY IS POSSIBLE.
(d) Turn ignition switch ON.
(e) Rotate the magneto, in its mounting, in the direction of normal operating rotation until the
timing light indicates the contact breaker points are open.
(f) Slowly rotate the magneto opposite normal rotation of the magneto on the engine
mounting until the timing light (or audible signal) goes out.
(g) Measure the distance from the reference mark previously scribed on the accessory case
and the corresponding reference mark on the magneto. If this measurement is more than
1/8 inch, remove the magneto (paragraph B) and inspect/adjust the contact breaker points
per paragraphs C (4) & (5) and E (9) & (10), respectively. A 1/8 inch change corresponds
to an approximate 5° change in internal magneto timing.
(h) Secure the magneto in this position, alternately tightening the magneto mounting clamps -
first to 8 ft-lbs. and finally to 17 ft-lbs. of torque.
(i) Turn ignition switch OFF.
(2) Inspect harness. See 74-20-00.
(3) Inspect vent holes. Ensure vent holes are clean and clear of any obstruction.
(4) Inspect P-lead attachment. The P-lead connects the magneto primary circuit to the ignition
switch. If the P-lead is disconnected, the magneto will be “HOT” and will fire the spark plug if
the propeller is rotated. Verify that the P-lead is attached to the condenser stud. Torque to
13 to 15 in-lbs.
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