Piper PA-28-161, Maintenance Manual

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PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 18
Nov 30/06
5C24
74-10-00
(5) Turn the engine crankshaft in the normal direction of rotation until the No. 1 cylinder is in the
full-advance firing position.
(a) Cover spark plug hole of number one cylinder with thumb. Rotate crankshaft until
pressure is felt on thumb.
(b) 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 (see Figure 1). When the 25° mark on the gear is aligned with the small
hole, number one piston is at 25° BTC.
NOTE: verify correct engine timing for the airplane being worked on by checking the
engine data plate.
(6) Place a new gasket on magneto flange. Install magneto carefully so drive coupling lugs mate
with slots of drive bushings. Install holding washers, lockwashers, and nuts.
NOTE: Do not tighten completely. Allow for turning magneto for final timing.
(7) After the magneto is installed on engine, remove the timing pin. The magneto is now ready to
be timed to the engine.
(8) Complete magneto to engine timing procedure listed under 100 Hour Inspection, above.
WARNING: THE MAGNETO IS NOT INTERNALLY GROUNDED, WHEN THE GROUND
LEAD IS DISCONNECTED THE MAGNETO IS HOT. REMOVING THE
HARNESS ASSEMBLY FIRST AND INSTALLING IT LAST, MINIMIZES THE
DANGER OF STARTING THE ENGINE ACCIDENTALLY WHEN THE GROUND
LEAD IS REMOVED FROM THE MAGNETO.
(9) Replace the harness cap onto the magneto. Align the index marks made on the harness cap
and distributor housing when removed.
(10) Connect the P-lead and pressurization tube to magneto. Connect the retard breaker lead to the
starting circuit to the left magneto.