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PART 9-1-
GENERAL IGNITION SYSTEM SERVICE
9-7
2 and 3. After the proper gap is ob-
tained, check the plugs on a testing
machine. Compare the sparking effi-
ciency of the cleaned and gapped
plug with a new plug. Replace the
plug if it fails to meet 70% of the
new plug performance.
Test the plugs for compression
leakage at the insulator seal. Apply
a coating of oil to the shoulder of
the plug where the insulator projects
through the shell, and to the top of
the plug, where the center electrode
and terminal project from the insu-
lator. Place the spark plug under
pressure with the tester's high ten-
sion wire removed from the spark
plug. Leakage is indicated by air
bubbling through the oil. If the test
indicates compression leakage, re-
place the plug.
If
the plug is satis-
factory, wipe it clean.
IGNITION TIMING
Incorrect ignition timing can be
caused by:
1. Timing incorrectly adjusted.
2. Distributor
bushing
and / or
shaft worn, or a bent distributor
shaft.
3. Defective vacuum advance sys-
tem.
4. Defective centrifugal advance.
IGNITION SYSTEM TESTS-
ROTUNDA TESTERS
TEST CONNECTIONS-RE-235,
RE-651, AND RE-881
The test connections for the RE-
235 tester are shown in Fig. 16, the
test connections for the RE-651
te~ter
are shown in Fig. 17, and the
test connections for the RE-8 81
tester are shown in Fig. 18.
1. With the tester turned off, plug
the power plug into a proper AC
outlet.
2. Connect the green lead to the
distributor terminal of the coil.
On a car equipped with a
transistor ignition, connect this
green lead to the terminal on the
red side of the tachometer block.
3. Remove the No. 1 plug wire
from the distributor cap, place the
blue pickup in the cap and place the
plug wire in the pickup.
4. Now connect the black lead to
a good ground.
If the car has a transistor igni-
tion, connect the black lead to the
terminal on the black side of the
tachometer block.
5. Clip the red pickup over the
coil-to-distributor high tension wire.
PLUG
LINE
50
40
30
2f
D..:::~~
4(0 3(5 30 2
1
5 2
1
0 1
1
5
aCYL.
SEC
15 KV
• •
PRie
• 30 KV
Ofh •
• Tllll18
LIGHT
TEST
SELECTOR
0
11991-A
FIG.
16-Rotundo RE-235 Test Connedions
6. If the engine timing is to be
checked, plug the timing light into
its socket.
The following steps pertain to the
RE-651 and RE-881 testers only.
7. Disconnect the battery wire
from the regulator and place it in
the knob end of the 100 ampere
shunt.
8. Place the spade terminal from
the 100 ampere shunt and the yellow
lead on the battery terminal of the
voltage regulator.
9. Turn the ground polarity switch
to the minus position. On the RE-881
tester, turn the volts switch to the 20
volt position.
POINT RESISTANCE TEST
RE-651
Tester
1.
Remove and ground the high
tension wire from the center of the
distributor.
2. Turn the volts switch to the
point resistance (PT. RES.) posi-
tion. The points should be closed for
this test. If the breaker points are
open, the meter will read the battery
voltage ( 0 to 40 scale).
3. "Bump" the starter with the
starter switch until the voltmeter
pointer decreases to the lowest read-
ing in the black zone. On a car
equipped with a transistor igni-
tion, this bumping is done by
jumping between the "S" terminal
of the solenoid and the battery
with the ignition switch off and
the coil lead (brown wire) discon-
nected from the solenoid.
4. Depress the PT. RES. push-
button.
5. The voltmeter pointer should
read within the 12V area as shown
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