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Starting Systems State a major safety precaution when removing or working around a starting motor
Don’t make your starter an Arc Welder!Always unhook the battery ground Before removing the starter motor
Starting Systems Identify the following components Armature CommutatorBrushes Pole Shoe Field Coil
The Armature is a rotating electromagnet
Commutator bars allow current in and out of the armature
Brushes ride on commutator barsBrushes transfer electrons from the stationary field coils to the spinning armature
Insulated Brushes Grounded Brushes
Field Coils are Stationary ElectromagnetsPole Shoes concentrate the stationary magnetic field
Starting Systems Identify the following componentsStarter housing or frame Bushings Starter Drive Pinion Over-running clutch
Allow the armature to drag on the pole shoesWorn out bushings... Allow the armature to drag on the pole shoes This will slow the starter and INCREASE amp draw
Worn or Dry Armature shaft will INCREASE amp flow
Burned commutator bars restrict the amp flow
Worn out brushes DECREASE amp flow
There will be more questions......On the test…. …than I am covering here. Read your book… and complete Starter Labs
Test the Starting SystemCheck Cranking RPM Check Cranking Volts Check Cranking Amps
Low Cranking RPM A slow turning starter will pull extra ampsCould be caused by tight engine (New Engines) Can be caused by advanced timing
Low Cranking RPM Low cranking RPM…. …With low cranking Amps…Bad Starter Worn brushes, Bad commutator bars, open in field or armature
P = I x E Cranking Volts Power is required to turn motorLow volts will cause high amps
Low Cranking Volts Cranking volts at battery should be over 10VLoad test battery if low cranking volts Excessive amp draw can cause low cranking volts in a good battery
High Cranking Amps Check voltage drop across STARTER MOTORIf Battery cranking volt is 1/2 volt more than Starter volt drop diagnose battery cables and connections
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)
Before you install the rebuilt starterBench test the replacement It may save you a starter R & R
Starting Systems Understand the operation of the two starting circuits#1 Starter Control Circuit #2 Starter Motor Circuit
Starter Solenoid Understand the function of the Pull In solenoid windings…. …and the hold in solenoid windings
Starter Solenoids Predict the effect of an open circuit in the solenoid pull in windings…. ….and the solenoid hold in windings
Notice pitted contact ring
24 Volt Series/Parallel SwitchUnderstand how 12 volt batteries can be used to run a 24 Volt starting system
Series/Parallel SwitchDiagnose a defective series parallel switch using a volt meter
Starter Control Identify variations in starter control circuits
Test the Starting SystemThe Bottom Line Test cranking RPM Test Cranking Volts Test Cranking Amps
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