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Cessna 182 1978 - Magneto-To-Engine-Timing

Cessna 182 1978
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MODEL
182
&
T182
SERIES
SERVICE
MANUAL
11A-61.
INTERNAL
TIMING.
(MAGNETO
RE-
h.
While
holding
the
rotor
shaft.
loosen
the
screw
MOVED
FROM
ENGINE.)
securing
breaker
contact
cam
to
rotor
shaft
and
back
screw
out
approximately
half
way.
Place
the
end
of
NOTE
a
broad
bladed
screwdriver
between
the
bottom
of
the
cam
and
housing.
Strike
the
screwdriver
handle with
A
magneto,
correctly
timed
internally,
will
a
sharp
downward
blow
to
"pop"
the
cam
loose
from
have
the
red
painted
tooth
of
the
large
dis-
taper
of
shaft.
tributor
gears
approximately
centered
in
the
1.
Rotate
cam
until
breaker
contact
cam
followers
timing
windows,
the
L
("E"
gap)
mark
on
the
are
on
the
high
point
of
cam
lobes.
Adjust
breaker
rotor
shaft
in
alignment
with
the
pointer
and
points
to
obtain
a
clearance
of
0.
016±0.
004
inch
on
both
sets
of
breaker
contacts
opening,
all
at
LEFT
and
RIGHT
contacts
respectively.
Tighten
the
same
time.
breaker
contact
securing
screws
to
20-25
lb-in.
j.
Repeat
step
"c.
"
a.
Remove
breaker
contact
point
assembly
cover,
k.
While
holding
rotor
shaft
in
this
EXACT
position,
if
installed,
by
removing
the
cover
screws,
pulling
rotate
the
breaker
contact cam
in
the
opposite
direc-
cover
directly
aft
away
from
housing
and
disconnecting
tion
of
rotation
a
few
degrees
BEYOND
where
the
both
capacitor
leads
from
breaker
contact
assemblies.
breaker
contacts
close,
then
rotate
cam
in
the
normal
b.
Remove
timing
inspection
hole
plugs
from
mag-
direction
of
rotation
until
the
breaker
contacts
just
neto.
begin
to
open.
Point
opening
should
be
determined
c.
Slowly
turn
the
rotor
shaft
until
the
red
painted
by
the
use
of
a
timing
light
(Bendix
Part
No.
11-9110
tooth
of
the
large
distributor
gear
for
each
side
is
or
equivalent)
approximately
centered
in
the
inspection
windows
L
While
holding
cam
in
this
EXACT
POSITION,
with
the
L
("E"
gap)
mark
on
the
rotor
aligned
with
push
cam
on
rotor
shaft
as far
as
possible
with
the
the
pointer.
Lock
the
rotor
in
this
EXACT
position
fingers.
Tighten
cam
securing
screw
thereby
draw-
using
Bendix
Rotor
Holding
Tool,
Part
No.
11-8465
ing
the
cam
down
evenly
and
tightly.
Torque
cam
or
equivalent.
securing screw
to
16-20
lb-in.
NOTE
NOTE
Position
the
11-8465
Rotor
Holding
Tool
on
Extreme
care
must
be
exercised
in
this
oper-
drive
end
of
rotor
shaft
in
the
4
o'clock
ation.
If
cam
adjustment
is
changed
in
the
position
so
that
any
shaft
deflection
caused
slightest
degree,
the
timing
of
the
magneto
by
clamping
action
will
be
in
a
plane
parallel
will
be
thrown
off.
Do
not
drive
cam
on
rotor
to
the
breaker
contacts.
shaft
with
a
mallet
or
other
instrument.
d.
Connect
the
timing
light
(Bendix
Part
No. 11-
9110
or
equivalent)
black
lead
to
any
unpainted
sur-
m.
Recheck timing
to
make
sure
both
sets
of
breaker
face
of
the
magneto.
Connect
the
red
lead
to
the
left
contacts
begin
to
open
within
the
width
of
the
L
("E"
breaker
contact
terminal
and
the
green
lead
to
the
gap)
mark
and
that
the
contact
point
clearance
is
in
right
breaker
contact
terminal.
accordance
with
dimensions
in
step
"g".
e.
Carefully
adjust
the
LEFT
breaker
contacts
to
just
begin to
open
(light
will
go
out)
with the
timing
NOTE
pointer
within
the
width
of
the
L
("E"
gap)
mark.
f.
Repeat
step
"e"
for
the
RIGHT
breaker
contacts.
When
reinstaling
the
inspection hole
plugs,
g.
Loosen the
rotor
holding
tool
and
turn
rotor
make
sure
the
ventilated
plugs
are
installed
shaft
in
normal
direction
of
rotation
until
cam
follow-
in the
ends
of
the
magneto.
Torque
plugs
to
ers
of
contact
assemblies
are
on
the
high
point
of
cam
12-15
lb-in.
lobes.
Contact
point
clearance
should
be
0.
016±0.002
inch and
0.016±0.
004
inch
on
LEFT
and
RIGHT
con-
11A-62. MAGNETO-TO-ENGINE-TIMING.
The
tacts
respectively.
If
dimensions
do
not
fall
within
magneto
must
be
installed
with
its
timing marks
limits,
readjust
contact
points
and
recheck
to
be
sure carefully
aligned,
with
number
one
cylinder
on
its
the
points
just
begin
to
open when
the timing
pointer
compression
stroke
and
with
the
number
one
position
is
within
the
width
of
the
L
("E"
gap)
mark.
of
number
one
piston.
To
locate
the
compression
stroke
of
the number
one
cylinder, remove
the
lower
NOTES
spark
plug
from
number
2,
3,
4,
5,
and
6
cylinders.
Remove
the
upper
spark
plug
from
number
1
cylinder.
Wire
feeler
gages
are
recommended
when
Place
the
thumb
of
one
hand
over
the
spark
plug
hole
checking
contact
point
clearance.
of
number
one
cylinder
and
rotate crankshaft
in
the
direction
of
normal
rotation
until
the
compression
No
attempt
should
be
made
to
stone
or
dress
stroke
is
indicated
by
positive
pressure
inside
the
contact
points.
cylinder
lifting
the
thumb
off
the
spark
plug
hole.
After
the
compression
stroke
is
attained,
locate
If
the
above
conditions
are
met
and
within
number
one
piston
at
its
advanced
firing
position.
the
tolerance,
the
magneto
is
timed
inter-
Locating
the
advanced
firing
position
of
number
one
nally
and
ready
for
installation.
If
the
piston
may
be
obtained
by
rotating
the
crankshaft
above
conditions
are
not
within
tolerance,
opposite
to
its
normal
direction
of
rotation
until
it
is
proceed
to
step
"h".
approximately
30
degrees
before
top
dead
center
11A-16
Revision
1

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