surface.
If
roughened, polish it with sand paper
#400
or
so and wipe clean with
dry cloth.
Mica
pieces
in
commutator segments should be undercut
0.5-0.8mm
below
the
sliding surfaces of brushes.
5}
A heavy current runs through starter circuit. Check it and if any loose
connections detected, fasten tight again.
6-4 Battery
Battery requires good maintenance,
as
it
is
the Power Source for engine starting and
lamps.
Every
60Hr of run, check and service it
as
follows.
Even
when the engine
is
out
of
operation, it should
be
checked once
in
two
weeks or
in
summer, once a week, because
it
its
self-discharge.
1}
Screw off plug and check electrolyte
level.
Standard
level
is
about 10mm above
pole plate.
If
specific gravity
has
increased from evaporation of electrolyte, and distilled
water.
If
electrolyte spilled
out
of
cells (which does not involve
an
increase of its
specific gravity), add dilute sulphuric acid
of
1,280
in
specific gravity (at
20°C).
2}
To see how much battery
is
discharged, measure the specific gravity of its
electrolyte. The following table shows the relation between the degrees of
discharge and hydrometer readings (at 20°C).
Degree
of
Totally
3/4
1/2 1/4
Completely
Discharge discharged discharged
discharged
discharged charged
Hydrometer
1,160
1.190 1.220
1,250
1,280-1.300
Reading
Specific gravity varies with temperature. For the correction of hydrometer
reading, apply the formula given blow.
S20 = S + 0.007 (t-20).
S : Hydrometer reading
S20: Specific gravity
at
20°C
t : Electrolyte temperature
(oC)
Long use
of
battery
in
insufficient charge
will
do damage
to
its pole plates.
resulting
in
a remarkable drop of its efficiency.
Make
it a rule
to
recharge it
before it gets discharged any more than 1/2.
In
winter, a
fall
of temperature
-
54-
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