TEXTRON LYCOMING OPERATOR'S MANUAL
SECTION
5
0-360 and ASSOCIATED MODELS
NOTE
Some timing lights operate in the reverse manner as described. The light comes
on when the breaker points open. Check your timing light instructions.
c. Internal Timing - Dual Magneto - Check the magneto internal timing
and breaker synchronization in the following manner.
(1) Main Breakers
- Connect the timing light
negative lead to any
unpainted surface of the magneto. Connect one positive lead to the
left main breaker terminal and the second positive lead to the right
main breaker terminal.
(2) Back the engine up a few degrees and again bump forward toward
number one cylinder firing position while observing timing lights. Both
lights should go out to indicate opening of the main breakers when
the timing pointer is indicating within the width of the "L" or "R"
mark. If breaker timing is incorrect, loosen breaker screws and cor-
rect. Retorque breaker screws to 20 to 25 in. lbs.
(3) Retard Breaker - Remove timing light leads from the main breaker
terminals. Attach one positive lead to retard breaker terminal, and
second positive lead to the tachometer breaker terminal, if used.
(4) Back the engine up a few degrees and again bump forward toward
number one cylinder firing position until pointer is aligned with 15
retard timing mark. See figure 5-5. Retard breaker should just open
at this position.
(5) If retard timing is not correct, loosen cam securing screw and
turn the retard breaker cam
as required to make retard
breaker open
per paragraph c(4). Retorque cam screw to 16 to 20 in. lbs.
(6) Observe that tachometer breaker is opened by the cam lobe. No
synchronization of this breaker is required.
(7) Check action of impulse
coupling (D-2000/3000 series
only). With
the ignition switch off observe
breaker cam end of rotor while
manually
cranking engine through a
firing sequence. Rotor should
alternately
stop and then (with an audible snap) be rotated rapidly through a retard
firing position.
Revised March, 1990
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