Rotor Holding Tool Installed; Timing Kit Installed - Piper Navajo PA-31 Service Manual

224
225
Figure 8-11.
Rotor Holding Tool
Figure 8-12.
Timing Kit Installed
Installed
is applied on housing flange preventing
magnet from turning.
3. Loosen and rotate cam until cam follower of main contact assembly rests
on highest point of cam lobe. Adjust main contact assembly
to obtain the clearance
of 0.016 of an inch.
Tighten
main contact assembly securing
screws to 20-25
inch-pounds.
4. Install the 11-8693 Timing PlateAssembly
and the 11-8149 Pointer As-
sembly of the 11-8150 Scintilla
Timing Kit to breaker
compartment of magneto.
(Refer to Figure
8-12.) Align pointer assembly
with the 0
°
mark on timingplate.
Loosen adjusting
knob of 11-8465 Rotor Holding Tool and turn rotating magnet in
normal direction
of rotation until pointer indexes with the respective
E gap mark
(15
°
± 2°). Tighten adjusting
knob of 11-8465 Tool and remove the 11-8149 Point-
er Assembly from magneto.
Using a timing light, adjust main contact points to
just open. This adjustment
shall be made by rotating cam, in opposite direction
of rotation, a few degrees
beyond point where contacts close.
Then rotate cam
in normal direction
of rotation until contacts just open. While holding cam in this
exact position,
push cam on magnet shaft as far as possible with the fingers.
Ex-
treme care must be exercised
in this operation.
If cam adjustment
is changed in
the slightest degree,
the timing of the magneto will be thrown off.
Do not drive
cam on shaft with a mallet orotherinstrument.
Tighten the securingscrewthere-
by drawing the cam down, evenly and tightly. Torque non-self locking screw from 16 to 20
inch-pounds. Refer to the latest revision of Lycoming Service Instruction No. 1400 for infor-
mation regarding replacement of cam retaining screw. Loosen the 11-8465 Rotor Holding
Tool adjusting knob and return rotating magnet to neutral position. Reinstall the 11-8149
Pointer Assembly over 0
°
mark on timing plate. Rotate magnet shaft in normal direction of
rotation and check for opening of main contact points at E gap setting (15 °
± 2°).
Revised: 9/24/81
POWER PLANT
PIPER NAVAJO SERVICE MANUAL
2122