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Starting Systems State a major safety precaution when removing or working around a starting motor.

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Presentation on theme: "Starting Systems State a major safety precaution when removing or working around a starting motor."— Presentation transcript:

1 Starting Systems State a major safety precaution when removing or working around a starting motor

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6 Dont make your starter an Arc Welder! Always unhook the battery ground Before removing the starter motor

7 Starting Systems Identify the following components Armature Commutator Brushes Pole Shoe Field Coil

8 Starter Armatures

9 The Armature is a rotating electromagnet

10 Commutator bars allow current in and out of the armature

11 Brushes ride on commutator barsBrushes transfer electrons from the stationary field coils to the spinning armature

12 Insulated Brushes Grounded Brushes

13 Field Coils are Stationary Electromagnets Pole Shoes concentrate the stationary magnetic field

14 Starting Systems Identify the following components Starter housing or frame Bushings Starter Drive Pinion Over-running clutch

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22 Starter Diagnosis

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24 Worn out bushings... Allow the armature to drag on the pole shoes This will slow the starter and INCREASE amp draw

25 Worn or Dry Armature shaft will INCREASE amp flow

26 Burned commutator bars restrict the amp flow

27 Worn out brushes DECREASE amp flow

28 There will be more questions......On the test…. …than I am covering here. Read your book… and complete Starter Labs

29 Test the Starting System Check Cranking RPM Check Cranking Volts Check Cranking Amps

30 Low Cranking RPM A slow turning starter will pull extra amps Could be caused by tight engine (New Engines) Can be caused by advanced timing

31 Low Cranking RPM Low cranking RPM…. …With low cranking Amps… Bad Starter Worn brushes, Bad commutator bars, open in field or armature

32 Cranking Volts Power is required to turn motor P = I x E Low volts will cause high amps

33 Low Cranking Volts Cranking volts at battery should be over 10V Load test battery if low cranking volts Excessive amp draw can cause low cranking volts in a good battery

34 High Cranking Amps Check voltage drop across STARTER MOTOR If Battery cranking volt is 1/2 volt more than Starter volt drop diagnose battery cables and connections

35 If cranking volts are within 1 volt of battery… Insure engine turns freely Insure ignition does not cause slow turning engine Replace Starter Motor (assuming there are excessive amps)

36 Before you install the rebuilt starter Bench test the replacement It may save you a starter R & R

37 Starting Systems Understand the operation of the two starting circuits #1 Starter Control Circuit #2 Starter Motor Circuit

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43 Starter Solenoid Understand the function of the Pull In solenoid windings…. …and the hold in solenoid windings

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46 Starter Solenoids Predict the effect of an open circuit in the solenoid pull in windings…. ….and the solenoid hold in windings

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50 Notice pitted contact ring

51 24 Volt Series/Parallel Switch Understand how 12 volt batteries can be used to run a 24 Volt starting system

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54 Series/Parallel Switch Diagnose a defective series parallel switch using a volt meter

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59 Starter Control Identify variations in starter control circuits

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63 Test the Starting System The Bottom Line Test cranking RPM Test Cranking Volts Test Cranking Amps


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