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Automotive (level 2) > Starting Systems > Flashcards

Starting Systems Flashcards

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1
Q

How much amperage does a 4 cylinder starter take?

A

100A

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2
Q

How much amperage does a 6 cylinder starter take?

A

150A

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3
Q

How much amperage does a 8 cylinder take?

A

200A

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4
Q

What is the purpose of the starter?

A

Turns the crank until it can operate on its own

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5
Q

What is the average starter to engine gear ratio?

A

15:1 to 20:1

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6
Q

what RPM does the starter pinion gear turn at?

A

2500rpm to 3000rpm

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7
Q

what RPM does the flywheel turn at?

A

150rpm to 200rpm

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8
Q

what is CEMF?

A

Counter Electromotive Force traveling backwards towards the battery

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9
Q

What components are part of the Control Circuit?

A

Ignition switch, Safety switch, starter relay and battery

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10
Q

What components are part of the Starter Circuit?

A

battery, starter motor and starter solenoid

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11
Q

How many amps to pull in the starter solenoid?

A

35A

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12
Q

How many amps to hold in the starter solenoid?

A

10A

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13
Q

what is the preferred test to locate resistance in a starter circuit?

A

Voltage Drop (Voltmeter)

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14
Q

What is the rotating part of a starter called?

A

The Armature

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15
Q

What type of starter motor produces high torque at low RPM, and less as RPM increases?

A

Series

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16
Q

What type of starter motor has less torque at low RPM and higher as RPM increases?

A

Parallel / Shunt

17
Q

What type of starter motor is able to handle torque at any RPM?

A

Compound

18
Q

What are the 2 types of starters?

A

Positive Engagement & Solenoid Actuated

19
Q

What are the 2 main components to an Armature?

A

windings & commutator

20
Q

What is a Commentator made of?

A

Heavy copper segments (bars) that are separated from each other by insulation (mica)

21
Q

Newer starter motors may use what kind of gear setup that allows the assembly to be smaller?

A

planetary gearset

22
Q

What is the component of the armature where it receives its heavy current from?

A

The Commutator

23
Q

The segments of the commutator should have what type of resistance between themselves?

A

Low resistance & similar from bar to bar

24
Q

What 3 methods ensure that the pinion gear is able to engage the ring gear smoothly?

A

Beveled teeth, Spring behind the pinion gear & Bendix drive

25
Q

What could cause a Low current draw?

A

Undercharged battery

26
Q

What could causes high current draw?

A

Resistance in the motor

27
Q

What is an maximum Voltage drop across connectors?

A

0.1v

28
Q

What is an maximum Voltage drop across a Starter relay?

A

0.3v

29
Q

How do you check the starter drive to ring gear clearance?

A

feeler gauge or wire, if its less/more then 0.5cm (0.02”) it is defective

30
Q

When performing a bench test, what could be the cause of a slow speed/high draw?

A

Physical resistance (bearings, short in armature, bent armature)

31
Q

When performing a bench test, what could be the cause of no current draw/no crank?

A

Open in one of the circuits, broken brushes/springs

32
Q

When performing a bench test, what could be the cause of low RPM/low current draw?

A

High internal resistance (bad connection/brushes)

33
Q

When performing a bench test, what could be the cause of high RPM/high current?

A

Field windings shorted

34
Q

What should never be used to clean the starter motor and why?

A

Solvents, the residue left on parts can ignite

35
Q

What should be used to clean the starter motor?

A

Denatured alcohol or Compressed air (25psi)

36
Q

what is a cranking voltage test, and how do you perform it?

A

Measures the available Voltage to the starter during cranking. it is performed by disabling the fuel or bypassing the ignition switch and connecting a Voltmeter to ground and starter feed. activate the starter and observe that the voltage has a minimum of 9.6v

37
Q

what is a cranking current test, and how do you perform it?

A

Measures the amount of current the starter draws to crank the engine. it is performed by using a Inductive pickup clamp. Disable fuel and crank the engine for max 15sec and observe that the amperage is around 130A to 250A (depending on engine size)

Automotive (level 2) (12 decks)

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