Cessna 177 SERIES Service Manual

6. Remove the engine-to-magneto drive gear is not within plus zero degrees and minus two degrees,
train
backlash by turning
magneto drive opposite
to the magneto
should be retimed
to the engine.
normal rotation as far as possible.
7. With the
no. 1 cylinder at its correct firing
NOTE
position
and on the compression
stroke, hold the mag-
neto as close to its no.
1 firing position as
possible If ignition
trouble should develop,
spark plugs
(red tooth in center of window and
pointer over L and ignition wiring
should be checked first. If
("E" gap) mark on rotor)
and install magneto
to the the
trouble appears definitely
to be associated
engine.
Loosely tighten magneto in position.
with a magneto, the following may
be used to
help
disclose the source
of trouble.
NOTE
1. Remove
high-tension outlet
plate and check
To facilitate connection of a timing light to distributor block for moisture.
the switch lead ("P" lead) terminals, short 2. If any moisture is evident, lightly wipe with
adapter leads may be fabricated. These a soft, dry, clean, lint-free cloth. Install outlet
can
be made by using two switch
lead ter-
plate.
minals and two short pieces of insulated
wire. Install the fabricated adapter leads NOTE
in the switch lead outlet terminals of the
cover.
Since
these magnetos
MUST NOT
BE DIS-
ASSEMBLED,
a new magneto
should be
8. Attach
the red lead
of the timing
light (Bendix
installed
if the moisture
check
does not
Part
No. 11-9110
or equivalent)
to the
left switch
lead
remedy the
trouble.
adapter, the
green lead of the timing
light to the right
switch lead
adpater and the
black lead of
the timing
b. BENDIX
S-1200 AND D-2000
SERIES.
At the
light to the magneto housing (common
ground). first 25-hour inspection,
first 50-hour inspection,
each 100-hour
inspection and thereafter
at each
NOTE
100-hour inspection,
the contact breaker point com-
partment
and magneto-to-engine
timing
should be
An internal timing tolerance
is allowed when inspected and
checked. If magneto-to-engine timing
adjusting
the two main breakers.
Therefore,
is correct within
plus zero and minus two
degrees,
one
of the main breakers
may open slightly
internal timing
need not be checked.
If timing is out
before the other. Magneto-to-engine timing
of tolerance, remove magneto
and set internal timing
should be accomplished using the first main (paragraph 11-60), then install and time to the engine.
breaker
to open
as the
reference
point when
the
engine is in the firing position for No.
1
NOTE
cylinder.
This will
insure
that ignition
created be either spark
plug will not occur If engine
operating troubles develop which
prior to the desired engine firing point. appear to be caused by the ignition system,
it is
advisable
to check
the spark
plugs and
9.
Turn the entire magneto
in direction of rotor
ignition
harness first before
working on the
rotation until
the timing lights are on.
magnetos. If the trouble appears definitely
10. Turn magneto in
direction of rotor rotation, associated
with a magneto, the following
right-hand rotation to right and
left-hand rotation to may be used
to help disclose the source of
left, until one of the timing
lights just goes off. Then trouble
without overhauling the magneto.
tighten
the magneto
mounting
clamps
evenly in
this
position. 1. Moisture check.
11. Back the
engine up approximately 10
°
and
a. Remove contact breaker point assembly
then carefully "bump" the engine
forward while cover and inspect
cover, cables and capacitor for
observing
the timing lights.
moisture in the
area.
12. At the No.
1 cylinder firing position, one of
b. Inspect distributor block high tension
the
timing lights should
go off. Continue
turning the
outlets for
moisture.
engine in its normal
direction of rotation until the
c. If any moisture is evident, lightly
wipe
other
timing light
goes off.
This should be
not more
with a soft,
dry, clean,
lint-free cloth.
than 3 engine degrees later than the first light. If
not. repeat steps 9 thru 11 until these conditions are LCAUTION
obtained.
13. Make
sure the magneto
clamps are
tightened
Do not
use gasoline
or any other solvent,
securely, recheck timing
once more and remove as
these will remove the wax coating on
timing
equipment.
some parts
and cause an
electrical leak.
14. Reinstall
inspection
plugs
and torque
plugs to
12-15
lb-in.
2. Breaker
contact compartment
check.
a. Check
all parts of the
contact breaker
11-63.
MAINTENANCE.
assembly for security. Check distributor
block high-
a. SLICK. Magneto-to-engine
timing should
be tension outlet
springs for evidence
of spark erosion
checked
at the first 50 hours,
first 100 hours and
and proper height.
The end of spring
should not be
thereafter
at each
100 hours. If
timing to the
engine
more than 0.422
inch from top
of tower.
11-26 Change 4

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)