ELECTRICAL 35 8.3.3 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
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