Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 1411 / 1956

PAGE 3
Feb 28/07 7F13
74-10-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
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 20° mark on the gear is aligned with the small hole,
number one piston is at 20° BTC.
NOTE: Always verify correct BTC on the engine dataplate.
(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.
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 per Removal, below, and inspect/adjust the contact breaker
points as described in 500 Hour Inspection and Cleaning; and, Assembly - Time the
magneto internally; respectively, below. A 1/8 inch change corresponds to an approximate
5° change in internal magneto timing.
Engine Timing Marks (Typical)
Figure 1