Piper Cherokee Six - Page 588

PIPER CHEROKEE
SIX SERVICE MANUAL
10-48.
MAINTENANCE.
The
starting
circuit
should
be inspected
at regular
intervals,
the frequency
of which
should
be
determined
by
the amount
of service
and the conditions
under
which the
aircraft
is operated.
It is recommended
that
such
inspection
be made
at each
100 hours
and include
the
following:
a. The
battery
should
be checked
with
a hydrometer
to be
sure if
is fully
charged
and
filled
to the proper
level
with
approved
water.
A load
test should
be made
to
determine
battery
condition.
If
dirt and
corrosion
have
accumulated
on
the battery,
it
should
be cleaned
with a
solution
of baking
soda
and
water.
Be
sure
none of
the solution
enters
the battery
cells.
b. The
starting
circuit
wiring
should
be inspected
to be sure
that
all connec-
tions
are clean
and
tight and
that the
insulation
is
sound. A
voltage
loss test
should
be
made to
locate any
high-resistance
connections
that
would
affect start-
ing motor
efficiency.
This
test is
madewith
a low-reading
voltmeter
while crank-
ing the
engine
or at
approximately
100
amperes,
and
the following
limits
should
be
used:
1. Voltage
loss
from
insulated
battery
post
to starting
motor
terminal
-
0.3-volt maximum.
2. Voltage
loss from
battery
ground
post
to starter
frame
-
0.1-volt
maximum.
NOTE
If
voltage
loss
is greater
than
the
above
limits,
add-
itional
tests
should
be made
over
each
part
of the
cir-
cuit to
locate
the high-resistance
connections.
c. No lubrication
is required
on
the starting
motor
except
at the
time of
over-
haul.
Then
lubricate
the entire
shaft
under
Bendix
Drive,
fill
grooves
in
arma-
ture
shaft
at drive
end
and pack
gear
box with
1.3
to 2.0
ounces
of Lithium
Soap
Base Grease
#1925
Molytex
"O" or
equivalent.
d.
The starting
motor
should
be operated
for a
few seconds
with
the
ignition
switch off,
or in
airplanes
with a
combination
starter
and ignition
switch,
by
dis-
connecting
the
magneto
"P"
leads,
This
is
to determine
that
the
pinion
engages
properly
and
that
it turns
freely
without
binding
or
excessive
noise.
After
check-
ing
the system,
reconnect
the
"P" leads.
Then the
engine
should
be
started
two
or three
times
to see
that the
pinion disengages
properly
when
the engine
is shut
down.
10-49.
OVERHAUL.
If
during
the
above
inspection
any
indication
of starting
motor
difficulty
is
noted,
the
starting
motor
should
be removed
from
the engine
for cleaning
and
repair.
ELECTRICAL
SYSTEM
Issued:
8/17/72
3C12