Westerbeke 3.5 BCG - Starter Motor; Testing

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
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