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6D-32
1977 PONTIAC SERVICE MANUAL
Fig. 6D-39 Checking Internal Coil
IGNITION COIL
-
1
-
OHMMETER OHMMETER OHMMETER
Fig. 6D-40 Checking External Coil
are consistently greater than normal or that a plug which is
too hot is being used. In addition, electrode wear may be the
result of plug overheating, caused by combustion gases
leaking past the threads, due to insufficient torquing of the
spark plug. Excessively lean carburetion will also result in
excessive electrode wear.
Broken insulators are usually the result of improper
installation or carelessness when regapping the plug. Broken
upper insulators usually result from a poor fitting wrench or
an outside blow. The cracked insulator may not make itself
evident immediately, but will as soon as oil or moisture
penetrates the fracture. The fracture is usually just below the
crimped part of shell and may not be visible.
OHMMETER OHMMETER
I
Fig. 6D-4 1 Checking Pick-Up Coil
VACUUM UNIT
ATTACHING SCREWS
A
THIN "C"
-
rHER
PICKUP
SCREW
MODULE
/
CONNECTOR
d
GROUND
SCREW
1384
Fig. 6D-42 Distributor Base and Components
Broken lower insulators usually result from carelessness
when regapping and generally are visible. In fairly rare
instances, this type of break may result from the plug
operating too "hot" such as encountered in sustained periods
of high-speed operation or under extremely heavy loads.
When regapping a spark plug, to avoid lower insulator
breakage, always make the gap adjustment by bending the
ground (side) electrode. Spark plugs with broken insulators
should always be replaced.
ON-CAR SERVICE
H.E.I. DISTRIBUTOR
Service Precautions
1. When making compression checks, disconnect the
ignition switch feed wire at the distributor. When
disconnecting this connector do not use a screwdriver or tool
to release the locking tab as it may break.
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