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Reciprocating Engine > Module 7 Ignition System > Flashcards

Module 7 Ignition System Flashcards

1
Q

What is the purpose of a continuity check test on an ignition?

A

Checks for continuity of the lead from the distribution cap to the spark end

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2
Q

what check is done on the ignition lead to test the integrity of the insulation

A

isolation check ( ignition lead leakage text)

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3
Q

what is the number 3t indicate on an ignition lead?

A

ignition lead goes to the top of cylinder #3

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4
Q

what are the main two terminal ends sizes

A

5/8 - 24 and 3/4 -20 (thread and pitch)

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5
Q

which terminal is the most common

A

3/4-20

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6
Q

what are the two main electrode type for A/C spark plugs

A

massive electrode and fine wire

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7
Q

what type of electrode type would least prone to lead deposits

A

fine wire

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8
Q

when removing your spark plugs for servicing you should put them in a number tray, why?

A

the visual inspection of the of a spark plug reveals much about the efficiency of the combustion

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9
Q

excessive oil found on a spark plug could be result of?

A
  • extend engine shut down -idling
  • damage piston
  • worn or faulty piston rings, valve guides, etc.
  • new engine still in break-in period
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10
Q

excessive lead deposits appears as

A

hard bead-like deposits in the firing cavity of a spark plug

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11
Q

how are the lead and carbon deposits removed from the spark plug firing end?

A

vibrating tool

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12
Q

what is the manufacture primary reason for numbering spark plugs

A

plugs are designed for specific engines

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13
Q

a spark plug with a long nose insulator is a ?

A

hot plug-to be used in a cold engine

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14
Q

what is the purpose of the resistor in a shielded spark plug for an aircraft engine

A

minimize electrode erosion

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15
Q

when are the electrodes of a spark worn out?

A

when the electrodes are half size of their original size

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16
Q

what will occur if the spark plug gap is excessive

A

the intensity of the spark will be incorrect leading to difficulty to starting

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17
Q

you should always rotate the spark plugs positions when reinstalling them, why?

A

to equalize plug wear , rotate from top to bottom and next in the fired order.

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18
Q

before installing spark plug one should?

A

lubricate the threads and change the bronze gasket

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19
Q

when reinstalling a spark plugs, torque to specified torque using a _____ sided deep socket

A

six

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20
Q

if you where given a task of doing a spark plug change, describe how you would after removal: clean, and service them and reinstall them

A

text book servicing 8-101 thru 8-106

21
Q

there are 2 magnetos checks an engineer should carry out after ignition work ?

A
  • live magneto check

- magneto drop check

22
Q

the purpose of the magnet in the magneto is to?

A

provides magnetic lines from of flux-flow from north to south

23
Q

what is meant by the term “full register” position

A

when the magneto poles are aligned with the pole shoes (magnet field is stronger)

24
Q

the clearance between a roting magnet and the pole shoes must be as little as possible because?

A

the air is not a good conductor of the magnetic flux

25
Q

why laminated pole shoes used magnetos

A
  • to reduce eddy currents

- keeps the magnetos cooler and boost efficiency

26
Q

with reference to the magneto, magnet zero is the

A

point at which the poles between pole shoes are centered between poles shoes

27
Q

the magneto coil has ______ and ______ winds

A

primary and secondary

28
Q

in respect to the electrical flow, what are the difference between the primary and secondary coils

A

primary= low voltage -high amperage

secondary=high voltage -low amperage

29
Q

what is the function of the distributor rotor

A

conducts the high voltage to out put pulses

30
Q

what is the speed of the distributor rotor to engine RPM

A

one half engine crankshaft

31
Q

function of the distributor block ?

A

when the finger of the distributor aligns with the electrode, voltage is transfered to the respective spark plug

32
Q

what it will cause distributor flash over ?

A

moisture or carbon tracking

33
Q

the numbers on the magneto block adjacent to the ignition wire indicates?

A

the firing order of the magneto (LH or RH rotation)

34
Q

what is the function of the contact breakers

A

to open and break flow of electricity in the primary coil

35
Q

what is a cam follower

A

the nylon piece which rides on the cam to open and close the contact breakers points

36
Q

how is the breaker cam lubricated

A

by felt oiler pad

37
Q

the condenser used in conjunction with magneto points is connected by?

A

parallel

38
Q

when you have burned and pitted points in a magneto the part most likely to cause this is?

A

the condenser or capacitor

39
Q

beside preventing with arching of points , the condenser is used for what purpose?

A

it assist (hastens) the rapid collapse of the primary

40
Q

on installations of a magneto on an engine, the magneto should be set at

A

fire #1 cylinder-red tooth in window engine set before TDC on the compression stroke

41
Q

why does magneto ignition system require and auxiliary starting system?

A

because the coming speed of the magneto is 100-200 RPM , and the spark is to advanced and will cause kick back during starting

42
Q

an impulse coupling will increase the rotational speed of the magneto and:

A

retard the spark to TDC to prevents kick back

43
Q

if an impulse coupling breaks, the magneto will?

A

fired in a retard position TDC during normal operation

44
Q

an shower sparks ignition system uses a set of retards breakers to:

A

retard the ignition timing to TDC to prevent kickback during starting

45
Q

due to the difference in exhaust gas scavenging and difference in temperature distribution, some manufactures prescribe a:

A

staggered ignition- ie. degrees and 22 degrees

46
Q

why is the trailing electrode necessary in some booster coil magneto distributors?

A

to prevent kick back during starting

47
Q

why do spark plug wires have a heavy insulation?

A

to prevent leakage of high tension current

48
Q

why are the ignition leads shielded

A

prevents high frequency electromagnetic waves ( radio interference)

Reciprocating Engine (10 decks)

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