Operator`s manual

Section 4
Ignition System
OVERHAUL MANUAL-
LYCOMING DIRECT DRIVE AIRCRAFT ENGINES
c. Remove the switch,
coil and retard
leads
from
their terminals
in the distributor
block.
d. Loosen
the two setscrews mounted
radially in
the
rear flange of the
magneto and carefully
re-
move the distributor block from the magneto.
e. Reach into
the magneto and
grasp the rotor.
Note that when the rotor is turned counterclock-
wise to
the point of breaker
opening it will spring
forward in a clockwise
direction if it
is releas-
ed;
therefore it must be
held inthe counterclock-
wise position
while the magneto
is rotated back
and forth until
the breaker points
begin to open.
4-48.
Tighten
the magneto
mounting
clamps and
re-
placethe breather plug, shield, lockwasher andscrew
in
the 'T" opening, or if
the distributor block was
re-
moved:
a.
Connect the capacitor,
coil and retard
leads
to their terminals
in the distributor
block and
position the distributor
block carefully
in place
inthe
magneto. Be sure
the coil and retard
leads
are not pinched
betweenthe block and
the housing.
b. Tighten the two
setscrews that secure
the
block
in the
magneto.
c.
Secure the harness
to the magneto with
four
setscrews. Besurethe coil and retard leads are
not pinched between
the magneto and
the cable
outlet plate.
d. Replace
switch, coil
and retard leads.
4-49. When this has been accomplished the magneto
is properly timed to
the engine. If a recheck
is re-
quired, or at anytime magneto timing is checked, it
is necessary to hold out the backlash from the gears
as described inparagraph
4-47 and the accompanying
note, while a second person turns crankshaft through
20 degrees to firing position of No. 1 cylinder.
4-50. IGNITION HARNESS.
After the magnetos
have
been timed to the engine, assemble the leads to the
sparkplugs. Consult the applicable wiring diagram for
your installation. See figure 4-7, 4-8, 4-9, 4-10 or
4-11.
4-8 Revised October 1974