Starter Motor; Troubleshooting - Westerbeke 10.0 EGTD Operator's Manual

STARTER MOTOR
·DESCRIPTION
The starter is a new type, small. light-weight and is called a
ibigh-speed internal-reduction starter. The pinion shaft is
~eparate
from the motor shaft; the pinion slides only on the
jpinion 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 that the pinion may slide
~moothly
without becoming fouled with dust and grease. The
trnotor shaft is supported
at
both ends on ball bearings. The
~ever
mechanism, switch and overrunning clutch inner circuit
;are identical
to
conventional ones.
MOTOR
TYPICAL
STARTER MOTOR
REFER TO THE WIRING
DIAGRAM IN THIS MANUAL
STARTER MOTOR
SOLENOID
These are basically DC electric motors and used almost
exclusively on small and large marine diesel propulsion
engines and generators. These are direct current or compound
wound starter motors. They operate either on
12
or
24
volts
DC. On larger horsepower diesels, the starting motors are
provided with reduction gears to transmit higher torque to
crank the engine. You will also find reduction gear starter
motors used on many smaller horsepower diesels to help
provide good engine cranking speeds.
TROUBLESHOOTING
Prior to testing, make certain the ships batteries are at full charge
and that the starting system wiring connections (terminals) are
clean and tight. Pay particular attention to the ground wire
co1111ections on the engine block
To check the wiring,
try
cranking the staiter for a few seconds,
never more than 10 seconds at a time, then run your hand along
the wires and tenninals looking for wmm spots that indicate
resistai1ce. Repair or replace
ailY
trouble spots.
Using a multin1eter, test the voltage between the positive tenninal
stud on the start solenoid and the engine block (ground).
If you read 12 volts, the starter is faulty.
A
WARNING:
The following emergency starting
procedures
must
not be used with gasoline engi11es.
Sparks could cause an explosion and fire.
IGNITION
TERMINAL
(M) TERMINAL
To test the ignition circuit, locate the ignition(s) terminal (it
is
one of the small terminal studs and is wired
to
the ignition
circuit). Use a screwdriver, don't touch the blade, to jump
from that ignition terminal to the positive battery c01111ection
terminal on the solenoid.
If the starter cranks, the fault lies with the ignition
circuit.
If the solenoid clicks but
nothing happens, the starter
motor is probably faulty.
SOLENOID
IGNITtON
TERMINAL
~
.~
If nothing happens at all, the solenoid is not getting
current.. Check the battery isolation switch and inspect the
wiring co1111ections.
it is
also possible that the solenoid
is
defective. ·
A
WARNING:
There will be arching and sparks will
fly when jumping terminals. Be certain the engine
space is free of potentially explosive fumes, especially
gasoline, and that there are NO flammable solvents or
materials stored nearby.
Engines & Generators
23.