Module 7 Ignition System Flashcards
(48 cards)
What is the purpose of a continuity check test on an ignition?
Checks for continuity of the lead from the distribution cap to the spark end
what check is done on the ignition lead to test the integrity of the insulation
isolation check ( ignition lead leakage text)
what is the number 3t indicate on an ignition lead?
ignition lead goes to the top of cylinder #3
what are the main two terminal ends sizes
5/8 - 24 and 3/4 -20 (thread and pitch)
which terminal is the most common
3/4-20
what are the two main electrode type for A/C spark plugs
massive electrode and fine wire
what type of electrode type would least prone to lead deposits
fine wire
when removing your spark plugs for servicing you should put them in a number tray, why?
the visual inspection of the of a spark plug reveals much about the efficiency of the combustion
excessive oil found on a spark plug could be result of?
- extend engine shut down -idling
- damage piston
- worn or faulty piston rings, valve guides, etc.
- new engine still in break-in period
excessive lead deposits appears as
hard bead-like deposits in the firing cavity of a spark plug
how are the lead and carbon deposits removed from the spark plug firing end?
vibrating tool
what is the manufacture primary reason for numbering spark plugs
plugs are designed for specific engines
a spark plug with a long nose insulator is a ?
hot plug-to be used in a cold engine
what is the purpose of the resistor in a shielded spark plug for an aircraft engine
minimize electrode erosion
when are the electrodes of a spark worn out?
when the electrodes are half size of their original size
what will occur if the spark plug gap is excessive
the intensity of the spark will be incorrect leading to difficulty to starting
you should always rotate the spark plugs positions when reinstalling them, why?
to equalize plug wear , rotate from top to bottom and next in the fired order.
before installing spark plug one should?
lubricate the threads and change the bronze gasket
when reinstalling a spark plugs, torque to specified torque using a _____ sided deep socket
six
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
text book servicing 8-101 thru 8-106
there are 2 magnetos checks an engineer should carry out after ignition work ?
- live magneto check
- magneto drop check
the purpose of the magnet in the magneto is to?
provides magnetic lines from of flux-flow from north to south
what is meant by the term “full register” position
when the magneto poles are aligned with the pole shoes (magnet field is stronger)
the clearance between a roting magnet and the pole shoes must be as little as possible because?
the air is not a good conductor of the magnetic flux
