Westerbeke 7.0 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 overrunning clutch section which transmits an arma-
ture torque, preventing motor overrun after starting.
• A switch section (solenoid) which is operated when actu-
ating the overrunning clutch through a lever and which
supplies load current to the motor.
The starter is a new type, small, light-weight and is called a
high-speed internal-reduction starter. The pinion shaft is sep-
arate from the motor shaft; the pinion slides only on the pin-
ion shaft. A reduction gear is installed between the motor
shaft and a pinion shaft. The pinion sliding part is not
exposed outside the starter so thatthe pinion may slide
smoothly without becoming fouled with dust and grease. The
motor shaft is supported at both ends on ball bearings. The
lever mechanism, switch and overrunning clutch inner circuit
are identical to conventional ones.
ADJUSTMENT AND REPAIR
. .
If any abnormality is found by the following tests, the starter
should be disassembled and repaired.
Pinion Gap lnsp~ctlon
1. Connect a pattery (12V) between the starter terminal S
and the starter body, and the pinion drive should rotate out
and stop.
A CAUTION: Never.apply battery voltage for over 10
secandS continuously.
2. Lightly push the pinion back an.d measure the return
.· stroke (called pinion gap).
3. Ifth~.pinioii gapis not within the standard range, (0;5 to
2.0 mni), adjust it by increasing or decreasing the number
of shims on the Solenoid. The gap is decreased as the
number of shims increases.
D.5··2.omm
PINION GAP
No-Load Test
1. Connect the ammeter, voltmeter, and battery to the starter
as illustrated.
2. When the ~witch is closed, 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 repa1r it.
e ""
.--------------1 BATTERY
A CAUTION: Use thick wires as much as possible and
tighten 11very tllflllinal securely. This is a solenoid shift·
type starter Which makes a rotating sound louder.than
that of.a direct-drive type starter. When detecting
starter rotation at the pinion tip, be careful not ta came
in contact with the pinion gear when It ptatrudes.
SOLENOID
Perform 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 terminals S and M. Continuity will be found·
between terminals S and the body and terminal M and
the body.
MULTIMETER
NOTE: Disconnect 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: Oa not apply battery current far more .
than 10 seconds when testing the solenoid.
Engines & Generators
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