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IGNITION SYSTEM-DIAGNOSIS
8-4 1
PART 4
I G N I T I O N SYSTEM
Condition
SERVICE DIAGNOSIS
Possible Cause
Correction
BURNED O R
PITTED
DISTRIBUTOR
CONTACTS
(a) Dirt or oil on contacts.
(b) Alternator regulator setting too
high.
(c) Contacts misaligned or gap too small.
(d) Faulty coil.
(e) Ballast resistor not in circuit.
(f) Wrong condenser or faulty condenser.
(9) Faulty ignition switch.
(h) Bushings or distributor shaft worn.
(j) Touching the contacts with the hands during
installation.
IGNITION COIL
FAILURE
C NDENSER
ULURE
(a) Alternator regulator setting too
high.
(b) Coil damaged by excessive heat from engine.
(c) Coil tower carbon-tracked.
(d)
Oil
leak at tower.
(e) Coil tower carbon-tracked.
(a) Normal fatigue.
(b)
Damaged by excessive engine heat or
moisture.
I G N I T I O N SYSTEM
(a)
If
the oil
is
on contact face, determine the cause
and correct the condition. Clean the distributor
cam of dirt and grease, apply a
light
film of
distributor cam lubricant Number
1473595
to
cam lobes; wipe off the excess. Replace the
contact set and adjust as necessary.
(b) Test the alternator voltage regulator setting,
adjust as necessary. Replace and adjust the
distributor contacts.
(c) Align and adjust contacts.
(d)
Test and replace coil
if
necessary. Replace and
adjust contacts.
(e) Inspect conditions, and correctly connect the
coil.
(f)
Test the condenser and replace
if
necessary. Re-
place and adjust contacts.
(g) Replace the ignition switch.
(h) Recondition the distributor.
(i)
Replace and adjust the contacts.
(a) Test the alternator setting and adjust as neces-
sary. Inspect the condition of the distributor
contacts.
(b)
Replace coil. Inspect the condition of the distri-
butor contacts.
(c)
Replace the coil.
(d) Replace the coil.
(e) Wipe the tower clean. Test the coil, replace
if
necessary.
(a) Test and replace the condenser. Inspect distri-
(b)
Test and replace the condenser. Inspect distri-
butor contacts for pitting.
butor contacts for pitting.
6-CYLINDER DISTRIBUTOR
utor contacts and condenser, vehicle frame, and the
primary wiring make up the low voltage primary cir-
cuit. The secondary high voltage circuit includes the
coil secondary winding, the distributor cap and rotor,
the spark plug cables, the spark plugs and the vehicle
frame.
Description
The ignition system consists of two separate cir-
cuits. The battery, ammeter, ignition switch, ballast
resistor, primary winding of the ignition coil, distrib-
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