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 ELECTRICAL
spark plug, one with an improper heat range for the
IGNITION COIL (Fig. 2)
engine, may have been installed when replacing spark
plugs originally fitted by the engine manufacturer, and
A. Ignition Coil is mounted on the side of the cylinder
such misapplication may lead to poor performance.
block near the distributor.
Where abnormal operating conditions cause chronic
B. Coil should be tested with conventional coil tester,
carbon or oil fouling of the plugs, the use of a type with
following instructions furnished by manufacturer of
one or two numbers higher (a "hotter" type) than
testing equipment. Defects indicated by test are:
recommended in Specifications, will generally remedy
the trouble; and by the same formula, where chronic
1.
Open primary circuit.
preignition or rapid electrode wear is experienced, a
type with one or two numbers lower (a "cooler" type) will
2.
Open secondary circuit.
generally be found satisfactory.
3.
Shorted turns in primary or secondary.
B. REMOVAL
4.
High voltage breakdown in secondary.
IMPORTANT: Before removing any spark plug, blow all
dirt out of plug socket in cylinder head with compressed
5.
High resistance in primary connections.
air.
C. If any of the above conditions are evident, coil must
1.
Pull wires off spark plug terminals, using
be replaced.
caution to avoid damaging wire terminals. Remove
wires by firmly grasping large end of boot.
SPARK PLUGS
2.
Use spark plug wrench and unscrew plugs
A. GENERAL
from cylinder head. Ordinary wrenches may damage
porcelain. If gaskets do not remain on plugs, remove
Spark plug life is governed to a large extent by
them from cylinder head.
operating conditions, and plug life varies accordingly.
To insure peak performance, spark plugs should be
C. SERVICE
checked, cleaned and regapped every 500 hours.
1.
Inspect plugs for cracked porcelain and
Worn and dirty plugs may give satisfactory operation at
burned points, and check point gap. Also check for
idling speed, but under operating conditions they
loose terminals. Replace plugs which have excessively
frequently fail. Faulty plugs are evident in a number of
burned electrodes or cracked porcelain. Plugs should
ways such as wasting gas, power loss, loss of speed,
be cleaned with conventional sand-blast c 1 e a n i n g
hard starting and general poor engine performance.
equipment.
Spark plug failure, in addition to normal wear, may be
2.
Setting spark plug gap is a precision
due to dirty or leaded plugs, excessive gap, or broken
operation and should be treated as such. Refer to
insulator.
Specification Listing for proper gap dimensions. All
plugs must be set to the same dimension, using a
Refer to Specification Listing as the use of spark plugs
standard round feeler gauge.
in the proper Heat Range is of vital importance to good
engine performance. Frequently, the wrong type of
B-85
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