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 TM 55-1905-220-14-8
4-7.5. MAGNETO ASSEMBLY - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
TESTING (Con')
t
contact end of the lead snugly against the
cylinder block or other exposed parts of
the engine.
c.
Hold the live end of the remaining lead
approximately 1/8 inch from some exposed
part of the engine. Do not hold the lead
too near the spark plug port because the
escaping fuel mixture may be ignited.
d. Pull rapidly on the starter handle to crank
the engine. If the magneto is operating properly,
a spark between the lead and the
engine will be visible. Repeat operation
for the other spark plug lead.
2.
Spark
The condition of the spark plug can be checked in the
plug
same manner by attaching the leads to the spark plugs,
grounding the shell of the plugs against an exposed
part of the engine and cranking the engine rapidly.
Weak or intermittent sparking at the spark plug is
often caused by the following conditions:
a. Corroded, pitted or improperly adjusted
breaker points.
b. Defective condenser.
c.
Defective ignition coil.
d. Faulty electrical connections.
e. Faulty insulation, or a breakdown between the
ignition system and the radio shielding.
4-162
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