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9-10
GROUP 9-
IGNITION SYSTEM
Removal
t.
Disconnect the wires from the
spark plugs and distributor cap.
:Z. Pull the wires from the brackets
on the valve rocker arm covers and
remove the wires.
3. Remove the coil high tension
lead.
Cleaning and Inspection
Refer to section
3
of this part
for
the cleaning and
inspection
proce-
dures.
Installation
1.
Insert
each wire in the proper
socket of the distributor cap. Be sure
the wires are forced all the way down
into their sockets. The No.
1
socket
is identified on the cap. Install the
wires in a counterclockwise direction
in
the
firing
order
(1-3-7-2-6-5-4-8)
for 302 engines and
for 351 engines starting at the No. 1
socket. Cylinders are numbered from
front to rear; right bank 1-2-3-4, left
bank
5-6-7-8.
2.
Remove the brackets from the
old
spark
plug wire set and install
them on the new set in the same rela-
tive position. Install the wires in the
brackets on the valve rocker arm
covers. (Fig. 17). Connect the wires
to the proper spark plugs. Install the
coil high tension lead. Be sure the
No.7 spark plug wire is positioned
in
the bracket as shown in Fig. 17.
SPARK PLUGS
REMOVAL
1. Remove the wire from each
spark plug by grasping, twisting and
pulling the moulded cap of the wire
only. Do not
puB
on the wire
be-
cause
the wire coanectlon inside the
cap
may become
sepu~~ted
or
the
weather seal may be damaged.
2. Clean the area around each
spark plug port with compressed air,
and then remove the spark plugs.
CLEANING AND INSPECI'ION
Refer to section 3 of this part for
the cleaning and inspection proce-
dures.
ADJUSTMENT
Set the spark plug gap to specifica-
tions by bending the ground electrode
(Fig. 18).
INSTALLATION
1.
Install the spark plugs: Torque
18 mm. to 15-20 ft. lb. and 14 mm.
to 10-15
ft.
lb.
EJ
CLEANING AND INSPECTION
SPARK PLUGS
Examine the firing ends of the
spark plugs, noting the type of de-
posits and the degree of electrode
erosion. Refer to Fig. 19 for the var-
ious types of spark plug fouling and
their causes.
Clean the plugs on a sand blast
cleaner, following the manufacturer's
instructions. Do not prolong the use
of
the abrasive blast as it will erode
the Insulator and electrodes.
Clean the electrode surfaces with
a small file (Fig. 21). Dress the elec-
trodes to obtain flat parallel surfaces
on both the center and side elec-
trodes.
After cleaning, examine the plug
carefully for cracked or broken in-
sulators, badly pitted electrodes, and
other signs of failure. Replace as re-
quired.
DISTRIBUTORS
Soak all parts of the distributor as-
sembly (except the condenser, break-
er point assembly, lubricating wick,
vacuum diaphragm, distributor base
oil seal and electrical wiring) in a
mild cleaning solvent or mineral
spirits. Do not use a harsh cleaning
solution. Wipe all parts that can not
be immersed in a solvent with a clean
dry cloth.
After foreign deposits have been
loosened by soaking, scrub the parts
with a soft bristle brush. Do not
use
a
wire
brush, file, or other abrasive
objec;t. Dry the parts with compressed
air.
Examine the bushing surface(s) of
the distributor shaft and the bush-
ing(s) for wear.
Inspect the distributor cam lobes
for scoring and signs of wear. If any
lobe is scored or worn, replace the
cam assembly.
2. Connect the spark plug wires.
RESISTANCE WIRE REPLACEMENT
1. Disconnect the resistance wire
(pink) from the connection to the
.
red and green wire adjacent to the
brake master cylinder.
2.
Plug in the new resistance wire
and route it with the
main
wiring
down to the ignition coil. Tape it
to the
main
wiring.
3.
Connect the new resistance wire
to the coil battery terminal.
FIG. 18-
Checking Spark
Plug Gap
Inspect the breaker plate assembly
for signs of distortion. In addition, on
the dual advance distributor,
inspect
the stationary sub-plate for worn ny-
lon contact buttons. Replace the
breaker plate assembly if it is defec-
tive.
The breaker point assembly and
condenser should be replaced when-
ever the distributor is overhauled.
Inspect all electrical wiring for
fraying, breaks, etc., and replace any
that are not in good condition.
Check the distributor base for
cracks or other damage.
Check the diaphragm housing,
bracket, and rod for damage. Check
the vacuum line fitting for stripped
threads or other damage. Test the
vacuum fittings,
case, and dia-
phragm for leakage as explained
under Distributor Tests. Replace all
defective parts.
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