Cessna 182 1978 - Slip Ring Alignment; Timer Test; Trouble Shooting

MODEL
182 &
T182
SERIES
SERVICE
MANUAL
14-59.
TROUBLE
SHOOTING.
NOTE
The
propeller
de-ice
ammeter
may
be used
while trouble
shooting
the system.
The
ammeter needle
should
rest
within
the shaded
band for 90 seconds
while
the system
is
heating,
and then
to zero for
90 seconds
while the system
is off.
TROUBLE
PROBABLE
CAUSE
REMEDY
ELEMENTS
DO NOT
Circuit
breaker
out or
Reset
circuit
breaker.
If
HEAT.
defective,
it pops
out
again,
deter-
mine
cause
and correct.
Defective
wiring.
Repair
or replace
wiring.
Defective
switch.
Replace
switch.
Defective
timer.
Replace
timer.
Defective
brush-to-
Check
alignment.
Replace
slip
ring connection.
defective
parts.
CYCLING
SEQUENCE
Crossed
Connections
Correct wiring.
NOT
CORRECT
OR
NO
CYCLING.
Defective
timer.
Replace timer.
RAPID
BRUSH
WEAR.
Brush
block
or slip
Align
properly.
FREQUENT
BREAK-
ring
out of
align-
AGE.
SCREECHING
ment.
OR
CHATTERING.
14-60. TIMER TEST.
NOTE
a. Remove connector
plug of wire
harness from
timer and
jump power input socket
of wire harness
Excessive slip
ring run-out will result
in
to timer
input pin.
(Refer
to chart
following
this
severe
arcing
between
the slip
ring and
paragraph
for pin identification.)
brushes
and cause
rapid brush wear.
If
b. Jumptimer ground
pin to ground.
allowed to persist,
this condition will
c. Turn on de-ice
system.
result in rapid deterioration of the
slip
d. Check timer
operation per
the chart.
(Use a
ring and
brush contact
surfaces, leading
voltmeter.
)
to eventual
failure of the
de-ice system.
e. Check volts to ground
in each case. If
engine is
not
running,
and auxiliary
power
is not
used. voltage
a. Securely
attach dial
indicator
gage to
engine.
will
be battery
voltage
and
cycle
time may
be
slightly
and place
pointer
on slip
ring.
longer
than indicated.
b. Rotate
propeller
slowly
by hand.
noting the
f.
Hold voltmeter
probe
on the
pin until
the voltage
deviation
of the slip
ring from
a true
plane as
indi-
drops
to 0. Move the probe to the next
pin in the cated on
the gage.
sequence shown
in the
chart. Check
voltage at
each
c. Check
that total
run-out does
not exceed
0. 008-
pin
in sequence.
inch (±0.
004-inch).
Also
check that
run-out
does not
exceed
0. 002-inch
within
any 4-inches
of
slip ring
TIMER P/N
.............
3E1899-1
travel.
POWER
INPUT
PIN
.
.
......
.
B (28VDC)
....
GROUND
PIN ....
(28VDC)..
OUTPUT PIN
............
C (28VDC)
TIME
REPEAT
CYCLE
TIME (SECONDS)
...
.90
Due
to the loose
fit of some
propeller
thrust
bearings,
a considerable
error
14-61. SLIP
RING ALIGNMENT.
After
installation,
may
be indicated
in the readings
by
the slip
ring assembly
must
be checked
for
run-out,
pushing
in
or pulling
out on
the pro-
and
adjustments made.
if necessary.
peller while
rotating it.
Care must
be taken
to
exert a
uniform
push
or
pull
on the
propeller
to hold
this
error
to
a minimum.
14-19