LYCOMING OPERATOR’S MANUAL
SECTION 5
TIO-540 SERIES – ANGLE VALVE CYLINDER HEADS
MAINTENANCE PROCEDURES
Figure 5-4. Timing Marks on Rotating Magneto
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 correct. Retorque breaker screws to 2 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 5-4. 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 16-20 in. lbs.
(6) Observe that tachometer breaker is opened by the cam lobe. No synchronization of this breaker is
required.
5-5
Содержание TIO-540-A1A
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