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

Page: 1422 / 1956

PAGE 14
Feb 28/07
7F24
74-10-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
Index Plate and Timing Plug
Figure 9
3 Ensure that the T-150 "E" gap gauge is still positioned against the correct lamination.
Rotate magneto frame until it contacts the pin in the T-125 assembly fixture. Rotate
the magneto frame clockwise for left-hand rotation magnetos, counterclockwise for
right-hand rotation magnetos.
4 Hold magneto securely in base and tip magneto and T-125 assembly fixture. Tighten
one timing disk retaining screw to hold the timing disk in place. Remove magneto
from T-125 assembly fixture.
5 Turn T-125 assembly fixture over so that timing disk is facing you. Loosen timing disk
retaining screw. Scribe a mark on the timing disk corresponding to the index mark on the
T-125 base. This represents a point-of-reference for primary point "E" gap. (See Figure 9.)
NOTE: The actual number at the timing disk index mark is not critical. This index
mark will be used as a point of reference for setting the retard points a
specified number of degrees from the primary points.
6 Note the lag angle and direction of rotation from the magneto dataplate.
7 The ticks on the timing disk each represent 5° To set the timing disk in the proper
position, rotate the timing disk counterclockwise for left-hand rotation magnetos and
clockwise for right-hand rotation magnetos. Rotate the disk the appropriate number
of ticks for the lag angle noted on the magneto dataplate.
EXAMPLE:
Lag angle as noted from dataplate: 25°
Rotation as noted from dataplate: L
To set timing disk, turn the timing disk 5 ticks (5 x 5° = 25°) counterclockwise
using scribed mark as reference point.