TEST
PROCEDURE
-
STARTER
ON INGINE
CONDITION
POSSIBLE
FAULT
AND
CONRECTION
STARTEN FAILS
TO
ENERGIZE
A-2
Wiring:
Check
for badly corroded or loose connections,
also broken
or
frayed insulation,
Clean
and tighten
connections,
replace
wires
in
poor
condition.
Starting
Switch
or Solenoid:
Bypass
the switch
or
solenoid
with
iumper
wire
-
if
starter
cranks normally,
replace defective
part.
Batteryr
Check
speciffc
gravity
of
battery
-
if low, recharge
or
re-
place
battery
as necessary.
A-3
A-1
B.
STARTER
ENERGIZES
3U"
TURNS
TOO
SLOWLY
Battery: Check
condition
of battery
(See
A-3).
Brushes: Remove
end
cap,
check
for
unevenly worn
or
dirty brushes
and commutator.
Use a coarse
cloth
(not
emery
paper)
to
clean.
Beplaee
brushes
if excessively or unevenly worn. See brush
replace-
ment
procedure.
B-1
B-2
PERi,IANENT
II,IAG}IET
TYPE STARTING,TiOIORS
The
pcmanent Magpet
(PM)
starting motors
weigh
less than conventiond starters aad
require
less current
to
o1rerate. The
PM
starters
weigh less due to the fact
that ffeld
coils
are
eliminated. On c.onventicnal
starters,
a
relatively
healy
cuxent
is directed
thru
the ffeld
coils
to build up the strong magnetic
0eld
neessary
to start
the armature
turning. On
PM starters,
the
permanent
magnets
provide.this
strong ffeld, and oaly a small
current
is needed
in the armature
to start it
turning.
DNlvE UNIT
The
PM
starters
use a drive very
similar in appearanct
and function
to
a
Bendix
drive
arrangement.
Thers
are, however,
design difierences
which
excluded
it from
bing classiffed
as
a
Bendix &ive.
On
the PM starter
drive,
for example,
the inertia
absorbing eushion is
part of
the
pinion,
not separate, as on the
3endix
drives.
With
the'one
piece
uni! the
greater
mass
provides
more
inertia for
positive
engagement
plus
it
permits
use of a
heavier
duty anti-dri{t sprirg
for
quicker,
cleaner
disengagement. When
the
armature
starts to
turru the drive
pinion
moves
laterally on the splined
lrcrtion
of the armature
shaft into mesh with the ring
gear
on
the fywhoel
bf the
engine. As the
pinion
butts against the stop
or
spacer,
it locks in
positive
engagement
wi& the
armature
to turn
the engine.
When
the engine
&es and aftains
the speed
where
&e ffywheel begins
to'override"
the
arm-
ature,
the
greater
momentum
of
the
fywheel throws
the
pinion
out of mesh.
The anti-drift
spring
holds
the
pinion
in the reEacted
position
as the
armature coasts
to a
halt.
PRECAUIIONS
In
the event of a
'false
start', that
is, if the engine
gets
up suficient speed
to disengage
tbe
starter but
&en
feils to oontinue
running the engine must bo
allowed to come
to a complete
halt
before
a restart attempt
is
made.
If
the
flywheel is
still
rotating
when
the starter
is engaged, tho
pinion
and ring
gear
may
clash
and
damage the
teeth.
Even with
PM starters
which
can crank
for
Iong
periods without overheating, the crarking
time should
be
limited
to 60
seconds.
If an engine
fails
to start
after
this length
of time, there is
probably
somethiag
wrong
with
the en$ne
or it nay
be
out of fuel, flooded,
or there
may
be
poor
ignition or some
other cpnfition
preventing
it
from starting.
Make
sure
the
spccial shouldered capscrews
(and
lo&
washers) are used
when installi::g
starter. In addition
to
securing the
starter
to the machined
surface on
the craakcase, these
special
capscrews
Properly
align the
pin-
ion to the ring
gear
on the engiue.
Use of ordinary capscrews
will allow the starter
to shift which could
result
ia
clashing
of the
gears.
n
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