9. Loosen rotor holding tool and turn magnet in direction of rotation until adjacent R (E gap) mark is
aligned with pointer and lock in position. Both red painted teeth should be approximately centered in
timing windows.
—NOTE—
The use of the timing light unit, part number 11-9110-1 available
from Bendix will simplify internal timing procedure and breaker
synchronization.
10. Connect timing light black lead to any unpainted surface of magneto.
11. Connect red timing light lead to left breaker terminal and green lead to right main breaker terminal.
(Refer to figure 74-8.)
12. Loosen rotor holding tool and move rotor back a few degrees; then move it forward. Both lights should
go out to indicate opening of main breakers when timing pointer is indicating within width of R mark
and red painted teeth are centered in timing windows.
—NOTE—
On Bendix D-2000 ant D-3000 series magnetos, a cam self-
locking retaining screw should be installed in place of old non-
self-locking screw if not already installed. Tighten to a torque of
21 to 25 inchpounds. If this self-locking screw is removed at
anytime it should be replaced. Refer to latest revision of
Lycoming Service Instructions No. 1400 or Bendix Service
Bulletin No. 608.
13. If breaker timing is not correct, loosen cam securing screw (refer to figure 74-9) and unseat main
breaker cam from taper. Using 11-3031 Retaining Ring Pliers inserted in holes in cam, rotate main
breaker cam in direction of rotation until left main breaker points just open and press cam onto taper.
Tighten screw to seat main breaker cam.
14. Loosen rotor holding tool to turn rotating magnet back a few degrees; then turn rotating magnet in
normal direction of rotation. Timing light should go out when timing pointer is aligned with R (E gap)
mark. Lock rotating magnet in position where points just open.
15. Loosen right main breaker securing screws and position breaker so cam follower is pressed against
cam with points closed. Tighten contact assembly securing screws to prevent contact assembly from
bouncing back when moved. Using a small mallet and drift, tap right breaker in until points just open.
16. Turn rotating magnet back a few degrees; then turn rotating magnet in normal direction of rotation.
Both timing lights should go out within one degree or half width of R mark on rotor. If breakers are
not properly synchronized, reset right breaker.
17. Check right main breaker contact for 0.016 ± 0.004 inch point opening and tighten right breaker
contact securing screws to a torque of 20 to 25 inch-pounds. If point opening is out of limits, repeat
timing procedure setting left main breaker opening at 0.016 ± 0.002 inch. If right contacts open
beyond 0.020 inch, set left contacts closer to 0.0l8 inch. If right contacts open less than 0.012 inch, set
left contacts closer to 0.014 inch.
18. Using timing light, recheck timing to ensure main breakers open within one-half width of R mark and
that retard breaker opens at correct degree setting. Check left main breaker for 0.016 ± 0.002 inch
point opening and right main breaker and retard breaker for 0.016 ± 0.004 inch point opening.
—NOTE—
If correct breaker timing cannot be achieved, remove magneto
and have it overhauled
74 - 11 - 00
Page - 74-10
Reissued: August 1, 1986
2J6
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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