Starter Motor; Testing - Westerbeke 4.5 BCG Operator's Manual

STARTER MOTOR
DESCRIPTION
The
starter
can be roughly divided into the following sections:
• A motor section which generates a drive power.
• An ovexrunning clutch section which
transmits
an arma-
ture
torque, preventing motor overrun after starting.
•. A switch section (solenoid) which is operated when actu-
ating the ovemtnning clutch through a lever atld which
supplies load current to the motor.
The starter
is
a new
type;
small, Ught-weight and is called a
high-speed intetrlal-rediiCtion starter. The pinion shaft is sep-
arate from the
motor
shaft; the pinfon slides
oiily
on the pin-
ion shaft. A l."Cduttion gear is installed between the motor
shaft atld a pinion shaft. The pinion slidirig pint is not
exposed outside·the starter
so
that the pinion may slide
smoothly
without becoming
fouled with dust and
grease.
The
motor shaft is supp(>rted at
both
ends on ball bearings. The
lever mechanism, switch and overrunning clutch inner cixc:uit
are identical to conventional ones.
ADJUSTMENT AND-JIEPAIR
-
~
-
·
..
If any abnormality is
foun~
by the following tests, the starter
should
be
disassetn.bled and repaired.
Pinion Gap
lnsp~etlon
.
1. Connecta patteey (12V) between the starter terminal S
and
~e
starter body,
·~d
the pinion· driYe sht>nld rotate out
and stop.
A
~AutioN:
Never
apply bafflt;
voltage tor over
10
seconds
aoatlnawsly.
. 2. Lightly push
the pfuion back at1d measure the return
· stroke (called
pillion gap).
3. If
the
.pim.oti
gap is not within the standard range,(0:5 to
2.0 mni); adjust it
by
increasing or decreasingtl:ie number
of shims on
the solenoid.
The
gap
is
decreased
as
the .
number of shims increases.
PINION GAP ·
No-Load Test
1. Connect the ammeter, voltmeter, and battery to the starter
as illustrated.
2.
When the 11witch is clo6ed, the pinion must protrude and
the starter must run smoothly (at 3000
rpm
or more). If
the current or starter speed is out of specification, disas-
semble the starter and repair it.
- - - - - - - - - - - • BATTERY
A
CAUTION: Ilse thla/c wlrlls as much as possible and
tlghtrm lffll'Y tBrmlnal snare/y. This Is a solenoid
shift·
type starter
Whlt:b
makes a rotating.sound
louder.than
that of
a
dtreat-drlvt
fJll•
statfilr.
When
detecting
statter rotation
at
the pln/OiJ
tip,
bl t:atefUI not to come
·in oontaat with the pinion
gear
when If piOtrudes.
SOl.ENOllJ·
Petfonn the following tests. If any
test
result is not
satisfactory, replace the solenoid assembly.
1. Inspect the solenoid for continuity between terminals
( +)
and {-) and between terminals S and the body and
M and the body. There should be no continuity found
between tenninals S and M. Continuity will be found-
between terminais S and the body and terminal Mand
the body.
~.
L_LJ
@
MULTIMETER
NOT~
Disc<mnect
the
wire from terminal M.
2. Connect a battery
to
the
solenoid
•s
terminal S
for (
+)
and M for (-). Have a switch in the
+
lead and close it.
The pinion drive should extend
fully
out.
A
CAUTION: Da
not
apply battery
ourretit
for mars .
than 10
seaotf~
whBll testin!I the solenald.
Engin~s
& Generators
~.
22 ---- ... -