Page 159 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 9.2: Overhaul the starting motor over running

clutch

Objectives

At the end of this exercise you shall be able to
• remove the starter motor
• dismantle the starter motor
• test magnetic switch
• test the armature and commutator
• check continuity of field coils
• check overrunning clutch
• check end cover’s shaft bushes
• assemble starter motor
• test the starter motor for performance
• fit the starter motor on the engine.
Requirements

Tools/Instruments Equipments/Machines

• Trainees toolkit - 1 Set • Vehicle - 1 No.
• Box spanner - 1 No. Materials
• Multimeter - 1 No. • Emery paper - as reqd.
• Growler - 1 No. • Hacksaw blade - 1 No.
• V Block - 1 No. • Knife - 1 No.
• Dial test indicator with • Grease - as reqd.
Magnetic base - 1 No. • Bush bearing - 1 Set
• Vernier caliper - 1 No. • Magnetic switch - 1 Set
• Tap set - 1 No. • Circlip - 1 Set
• Battery with terminal - 1 No. • Battery cable with crocodile clip - 1 Set
• Spring tension tester - 1 No. • Copper brushers - 1 Set

Procedure

TASK 1: Remove the starter motor
1 Disconnect the negative(-) lead at the battery.

2 Disconnect the magnetic switch lead wires and the battery cable from the starting motor terminals.
3 Remove the two mounting bolts.
4 Remove the starter motor.
5 Remove the magnetic switch assembly (Fig 1)
6 Remove the cable terminal nut and disconnect the lead wires from the magnetic switch.
7 Remove the two mounting nuts and then take out the magnetic switch by slight tilting as shown. (Fig 2).

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