Cessna 177 SERIES Service Manual

housing. There are four timing
marks cast on the
NOTE
rotating
magnet. two on each
pole piece. When the
rotating
magnet is in its
neutral position and
then ro- Extreme
care must be exercised
in this
tated in normal
direction of rotation, the first timing
operation. If cam adjustment is changed
mark on rotating magnet to appear in ventilator hole in the slightest degree, the timing of the
is the "E" gap
mark for magnetos of this rotation.
magneto will be thrown off. Do not drive
The other mark on magnet is the "E" gap for mag- cam on shaft with a mallet or other instru-
netos of opposite
rotation.
ment.
5. While
holding rotating
magnet in this EXACT
location, adjust the
breaker contact points to just
12. Repeat steps 3, 4, 5 and 6.
begin to
open. Point opening
shall be determined
by
the use of a timing light.
(Bendix Part No. 11-9110 c. BENDIX
D-2000 (DUAL) SERIES. (MAGNETO
or equivalent.)
REMOVED
FROM ENGINE.)
6. Turn rotating magnet in normal direction of
rotation until cam follower
of contact assembly is on
NOTE
the
high point of cam lobe.
Contact point clearance
should be 0. 016=0.
003 inch. If dimension
does not
A magneto, correctly
timed internally, will
fall within limits,
readjust contact
points and
recheck
have the
red painted tooth
of the large
dis-
to
be sure the points just
begin to open when the
appli- tributor
gears approximately
centered in the
cable timing
mark (refer to
step 4) on magnet is
timing windows,
the L ("E" gap)
mark on
aligned
with divided
casting line
on housing ("E"
gap).
the rotor shaft
in alignment
with the pointer
and
both sets of breaker
contacts opening,
NOTES
all at
the same
time.
Wire feeler gages are recommended when 1. Remove breaker contact point assembly
checking contact point clearance, cover, if installed, by removing the cover screws,
pulling
cover directly aft
away from housing and
dis-
* No attempt should be made to stone or dress
connecting both capacitor leads
from breaker contact
contact points. assemblies.
2. Remove timing inspection hole plugs from
* If the above
conditions are met and within
magneto.
tolerance,
the magneto is timed
internally
3. Slowly turn
the rotor shaft until the
red
and ready for
installation. If
the above
painted
tooth of the
large distributor
gear for
each
conditions are not within tolerance, proceed side is approximately centered in the inspection
to step
7.
windows and the L ("E" gap) mark on
the rotor is
aligned with the
pointer. Lock the
rotor in this
7. Using
a pair of padded
jaw pliers
or a
vise.
EXACT position
using
Bendix Rotor
Holding
Tool,
grip the drive member on the drive
end of rotating Part No. 11-8465
or equivalent.
magnet. While
holding the rotating magnet,
loosen
the screw securing breaker
contact cam to rotating
NOTE
magnet shaft and back screw out approximately half
way. Place the
end of a broad
bladed screw
driver
Position the
11-8465 Rotor
Holding Tool
on
between the
bottom of the cam and
housing. Strike
drive end of rotor
shaft in the 4 o'clock
po-
the screw
driver handle with
a sharp downward blow
sition so
any shaft deflection
caused by
to "pop" the
cam loose from taper
of shaft.
clamping action
will be in a plane parallel
8. Rotate
cam until breaker contact cam follower
to the breaker contacts.
is on high point of cam lobe. Adjust breaker points to
obtain a
clearance of 0. 016±0.
003 inch. Tighten
4. Connect
the timing light (Bendix
Part No.
breaker
contact securing
screws
to 20-25
Ib-in.
11-9110
or equivalent)
black
lead to any
unpainted
9. Repeat
steps 3 and
4.
surface
of the magneto.
Connect the
red light lead
10. While
holding rotating
magnet in
this EXACT
to the left
breaker contact
terminal and
the green
location,
rotate the
breaker contact
cam in the oppo-
light
lead to the right
breaker contact
terminal.
site direction of rotation
a few degrees BEYOND 5. Carefully
adjust the LEFT breaker contacts
where
the breaker contacts close, then rotate cam
to just begin to open (light will go out) with
the timing
in the normal direction of rotation
until the breaker pointer within the
width of the L ("E" gap) mark.
contacts
just begin to open.
Point opening
shall be
6. Repeat
step 5 for the
RIGHT breaker
contacts.
determined by the use of a timing light. (Bendix 7. Loosen the rotor holding tool and turn rotor
Part
No. 11-9110
or equivalent.
)
shaft
in normal
direction
of rotation
until cam follow-
11. While
holding cam in this
EXACT position.
ers of contact assemblies
are on the high point
of cam
push cam on magnet shaft as far as possible with the lobes. Contact point clearance should be 0.016±0.002
fingers. Tighten cam securing screw thereby draw- inch and 0.0160. 004 inch on LEFT and RIGHT con-
ing the cam down evenly and tightly. Torque cam tacts respectively. If dimensions do not fall within
securing screw
to 16-20 lb-in.
limits,
readjust contact
points and
recheck to be
sure
the points
just begin to open
when the timing pointer
is within the width of the L ("E" gap) mark.
11-22
Change
2

Cessna 177 SERIES Specifications

General

Manufacturer	Cessna
Engine Type	Piston
Wingspan	35 ft 6 in (10.82 m)
Seating Capacity	4
Number Built	4, 295
Engine	Lycoming O-360
Horsepower	180 hp
Maximum Takeoff Weight	2, 500 lb (1, 134 kg)