Cessna 177 SERIES Service Manual

After the engine
has been placed in the correct
firing c.
BENDIX D-2000 (DUAL)
SERIES. The magneto
position,
install and time
the magneto to the engine
must be installed
with its timing marks
carefully
in the following
manner:
aligned, with number
one cylinder on its compression
1. Remove timing inspection plug
from top of stroke and with the number
one piston at its advanced
magneto. Turn magneto drive shaft in direction of firing position. Refer to paragraph 11-12 for the ad-
operating rotation until the applicable
timing mark vanced firing position
of number one piston. To lo-
on the distributor
gear is approximately
aligned with
cate the compression stroke
of the number one
cylin-
the
mark on the distributor
block.
Depress impulse
der,
remove the lower
spark plug from
number 2,
3
coupling pawls on left magneto
to rotate magneto and 4 cylinders.
Remove the upper spark plug from
shaft.
number 1 cylinder.
Place the thumb
of one hand over
the spark plug
hole of number one
cylinder and rotate
NOTE
crankshaft in
the direction of normal
rotation until
the compression
stroke is indicated
by positive pres-
The timing
marks are for
reference only.
sure
inside the cylinder
lifting the
thumb off the
spark
They should not be used
to adjust contact
plug hole.
After the compression
stroke is attained,
breaker
point opening
or to determine
pro-
locate
number one
piston at its
advanced
firing posi-
per timing
of the magneto.
(Refer to para-
tion.
Locating the
advanced firing
position of
number
graph 11-60
for internal timing. )
one
piston may be obtained
by rotating the crankshaft
opposite to its normal
direction of rotation
until it is
2.
Be sure magneto
gasket
(right magneto),
mag-
approximately
30 degrees
before top
dead center
neto adapter
and gaskets
(left magneto)
are in
place
(BTC) on
the compression
stroke
of number
one cyl-
and
that engine
is in the
correct firing
position,
then
inder. Rotate
crankshaft
in a normal
direction
to
install
magneto
approximately
at the angle
noted dur-
align
the timing
mark on the
front face
of the starter
ing removal,
tighten
mounting
nuts finger
tight.
ring
gear support
with the drilled
hole in
the starter,
making sure the final motion of the ring gear is in the
NOTE
direction of
normal rotation.
Be sure
to keep
timing marks
in the magneto
NOTE
aligned as
close as
possible
when installing
on the engine.
An accurate top center indicator which
screws
into a spark plug
mounting hole,
3. Connect
positive lead of the
timing light (Ben-
and a pendulum
pointer mounted
on a
dix
Part No. 11-9110
or equivalent)
to the switch
ter-
360-degree
timing disc may
also be used
minal (capacitor stud)
of the magneto. Secure
the to
locate the advanced
firing position.
common lead
of timing light to good
ground.
- The timing disc
should be adapted
to fit
4.
Rotate propeller opposite
to normal direction
over
the end of the propeller
spinner in
of rotation
a few degrees
(approximately
5 degrees)
such a manner
that
it may be rotated
as
to close the
magneto
breaker contact
points.
necessary.
In all
cases, it must
be
definitely determined that the number
NOTE
one
cylinder
is at the
correct
firing
posi-
tion and on the compression stroke, when
Do not
rotate
propeller
backward
enough
to
the
engine
is turned
in its
normal
direction
engage
impulse coupling,
or the propeller
of rotation.
will have to be rotated
in the normal
direc-
tion
of rotation
until impulse
coupling
re-
After
the engine
has
been
placed
in the
correct
firing
leases
on the
left magneto,
then
again
backed-
position,
install
the magneto
to the
engine
in the
fol-
up to a few degrees before
the firing position. lowing
manner:
1. Remove
the timing window
plug from the most
5. Slowly
advance
propeller
(tap forward
with
convenient
side of the
magneto
housing.
minute movements
as advanced
firing
position
is ap-
2.
Remove
the rotor
viewing
location
plug from
proached)
in normal direction
of rotation until
timing the
top center of the
housing.
light indicates
position
at which contacts
break.
The
3.
Turn the rotating
magnet
drive shaft
in the
contacts
should
break at the
advanced
firing position
normal
direction
of magneto
rotation
until the
red
of number
one cylinder.
Loosen
mounting
nuts
slight-
painted
tooth
of the
large
distributor
gear
is
centered
ly
and rotate
magneto
case
as required
to
cause
the
in
the timing
hole
(hole at
each side
of magneto).
contacts
to
break at
the correct
position.
Tighten
4.
Also
observe
at this
time that
the built
in
mounting
nuts.
pointer just
ahead
of the rotor
viewing
window
aligns
6.
After tightening
magneto
mounting
nuts,
re-
with
the L ("E"
gap) mark
on the rotor.
check timing.
Make
sure
that both
magnetos
are set
5. Install
the magneto-to-engine
gasket
on the
to fire at
the same
time. Remove
timing
equipment,
magneto flange.
install
spark plugs
and connect
spark plug
leads and
ignition switch
leads.
[WARNING
Do not attach
harness spark plug
leads to
the spark plugs until all magneto-to-engine
timing procedures are completed and the
switch
leads ("P"
leads) are connected.
Change 2 11-25

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)