Cessna 177 SERIES Service Manual

16-16.
TROUBLE
SHOOTING--BATTERY
POWER
SYSTEM
iCont).
TROUBLE
PROBABLE
CAUSE
REMEDY
BATTERY
WILL NOT
SUPPLY
Faulty contactor
contacts.
5.
Check voltage
on
"bus"
POWER
TO
BUS OR
IS INCAP-
side of contactor
with master
ABLE
OF CRANKING
ENGINE
switch closed.
Meter
normally
(Cont).
indicates
battery
voltage. If
voltage
is zero or intermittent,
replace
contactor.
If voltage
is normal,
_______ _ proceed to step 6.
Faulty
wiring
between
con-
6. Inspect
wiring
between
con-
tactor
and bus.
tactor
and bus.
Repair
or re-
place
wiring.
16-17.
REMOVAL
AND
INSTALLATION.
NOTE
(Refer
to figure
16-2.)
a.
Remove
aft
baggage
wall.
Remove
battery
from
aircraft
prior
to adding
b. Remove
the battery
box
cover.
electrolyte.
c. Disconnect
the
ground cable
from the
negative
battery terminal.
A
battery being
charged
and discharged
with use
will decompose
the
water from
the electrolyte
by
| CAUTION
electrolysis.
When
the water
is decomposed,
hydrogen
and oxygen
gases
are formed
which escape
into
the
*When
installing
or removing
battery,
always
atmosphere
through the
battery
vent system.
The
acid
observe
the proper
polarity
with the
aircraft
in
the solution
chemically
combines
with the plates
of
electrical
system
(negative
to
ground). Rever-
the battery
during
discharge
or is suspended
in the
sing the
polarity, even
momentarily,
may
result
electrolyte
solution
during charge.
Unless the
electrolyte
in failure
of semiconductor
devices
(alternator
has
been spilled
from a
battery, acid
should
not be added
diodes,
radio
protection
diodes,
and radio
transistors.
to the solution.
The
water, however
will
decompose
into
gases
and should
be replaced
regularly.
Add distilled
*Always
remove
the battery
ground
cable
water
as necessary
to maintain
the
electrolyte
level
first
and replace
it last to
prevent acci-
above the horizontal
baffle
plate, and
just below
the
dental
short
circuits.
split ring
on the filler
neck
inside the
battery.
When
activating
a
new dry charged
battery,
care must
be
d.
Disconnect
cable from
positive terminal
of battery.
taken to ensure
the proper
strength
of electrolyte
e. Lift
the battery
out of the
battery box.
is
used. The specific
gravity
of the electrolyte
must
f.
To install
the battery,
reverse
this
procedure.
be 1.285
± .005
when
measured
at 80°F
5°F.
When
electrolyte
level falls
below normal
with use,
add only
16-18.
CLEANING
THE BATTERY.
For maximum
distilled
water to maintain
the proper
level. The
battery
efficiency,
the
battery
and connections
should
be kept
electrolyte
contains
approximately
25%
sulphuric
acid
clean
at all times.
by
volume.
Any change
in this
volume will
hamper
the
a. Remove
the battery
and connections
in accord-
proper operation
of the battery.
ance
with the
preceding
paragraph.
b. Tighten
battery
cell filler
caps to prevent
the
cleaning
solution from
entering the
cells.
c. Wipe
the battery
cable ends,
battery terminals,
Do not add any
type of battery
rejuvenator
to
and the
entire surface
of
the battery
with a clean
the
electrolyte.
When
acid has
been spilled
cloth
moistened
with a solution
of
bicarbonate
of
from
a battery,
the acid
balance may
be adjust-
soda
(backing
soda)
and water.
ed by following
instructions
published
by the
d.
Rinse with
clean water,
wipe
off excess
water
Association
of
American
Battery
Manufacturers.
and allow
battery
to dry.
e. Brighter;
cable ends
and battery
terminals
with
16-20.
TESTING
THE BATTERY.
The
specific
emery
cloth or
a wire brush.
gravity
of the battery
may be
measured
with a
hydro-
f. Install
the battery
according
to
the preceding
meter
to determine
the
state of
the battery
charge.
If
paragraph.
the hydrometer
reading
is low, slow
charge
the bat-
g.
Coat the
battery terminals
with
petroleum
jelly
tery and
retest. Hydrometer
readings
of the electro-
or an ignition
spray
product
to reduce
corrosion.
lyte
must be
compensated
for the
temperature
of the
electrolyte.
Some
hydrometers
have
a built-in
ther-
16-1 9
ADDING
ELECTROLYTE
OR WATER
TO THE
mometer
and
conversion
chart.
The following
chart
BATTERY.
shows
the battery
condition
for various
hydrometer
readings
with
an electrolyte
temperature
of
80°F.
Change
8
16-5

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)