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ELECTRICAL
13
8.6 STARTER MOTOR
GENERAL DESCRIPTION:
The starting system consists of Ignition switch,
Starter relay, Battery, Starter motor and starter
fuses. The starter motor has high power DC motor
and starter solenoid which connects the battery
voltage to motor to crank the engine.
PRECAUTIONS:
DO’s
Starter motor shall be firmly mounted on to the
engine ensuring proper electrical grounding.
Tightening torque for terminal connections &
threaded Mounting hole shall be as per
specification.
Alterations in main power line & control line
wiring harnesses may adversely affect the
starter function and hence are to be approved
by the responsible development of Bosch &
customer.
Use suitably designed wiring hardness to
prevent short circuiting of starter terminals
During testing of Starter Motor on engine rig, it
is recommended to use 12V Generator power
supply source or OE battery with fully changed
condition.
During testing, ensure proper connection of
Starter Motor, Battery & Solenoid terminals
with available power source.
For assembly reasons, the starter terminals
are not generally protected against external
contact. Before carrying out work on the
engine near the Starter or on the Starter itself,
the battery or power source must be
disconnected.
DONT’S
For Starter Motor testing, avoid striking of
power source cable with Starter Motor battery
&solenoid terminals.
In order protect Starter Motor terminals from
painting marks, avoid application of grease.
During painting of engine, avoid spread of
paint on pinion, pinion shaft
Starter Motor should not be used for Green
Engine Starting and Green Engine priming.
Alternative methods have to be used (e.g.
Dyno based start or Slave Starter).
The Starter Motor should not be used as the
prime mover for the vehicle as in cases where
the vehicle gets drained of fuel and the Starter
Motor is subjected to drive the vehicle.
After engine fires, Starter Motors should not be
subjected to operation.
ROUTINE CHECKS:
Ensure that the starter motor mounting bolts to
the engine are securely fastened for proper
earthing.
Check electrical connections are clean and
tight.
Cables should be examined for fractures
particularly where the strands enter the
terminal lugs.
Inspect fixing bracket for any cracks
Check the general condition of the battery.
Ensure correct battery electrolyte level.
Check smooth functioning of ignition key
switch.