PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 3
Nov 30/06
5C9
74-10-00
2. Magnetos
A. 100 Hour Inspection
Every 100 hours or at annual inspection, whichever comes first, perform the following checks.
WARNING: BE SURE IGNITION SWITCH IS IN THE “OFF” POSITION AND THE
CONDENSER P-LEAD IS GROUNDED.
(1) Adjust timing to engine. (See Figure 1.)
(a) Turn the engine crankshaft in the normal direction of rotation until the No. 1 cylinder is in
the full-advance firing position.
1 Cover spark plug hole of number one cylinder with thumb. Rotate crankshaft until
pressure is felt on thumb.
2 Rotate crankshaft slowly until the advance timing mark on the starter ring gear is in
alignment with the small hole located at the two (2) o’clock position on the front face
of the starter housing. When the 25° mark on the gear is aligned with the small hole,
number one piston is at 25° BTC.
NOTE: Always verify correct engine timing for the airplane being worked on by
checking the engine data plate.
(b) Scribe a reference mark on the magneto mounting flange and engine accessory case.
(c) Loosen the magneto mounting bolts, and connect a standard timing light between engine
ground and the magneto condenser terminal.
Engine Timing Marks (Typical)
Figure 1
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