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13 ENGINE TUNE-UP
COIL
If a faulty coil is ,suspected, the coil should be
tested with a test light or approved coil testing
equipment.
A quick test with the coil on the car can b e
made by removing the high-tension wire from the
center of distributor cap and hold end of wire 1/4"
from cylinder head and while cranking engine, if
a spark occurs regularly the coil can be consid-
ered satisfactory.
IGNITION TIMING
1. Place a chalk mark on the long line before No.
1-U.D.C. on the vibration dampener, Figure 5.
FIGURE 5
2. Connect one lead of the power timing light to
No. 1 spark plug and the other lead to the
negative terminal of the battery.
3. With the engine idling properly, the timing
light flash should occur when the chalk mark
is in line with the pointer on the timing chain
cover.
If timing is off, make the necessary correction
by loosening the distributor advance arm screw
(on octane selector) and rotate distributor clock-
wise for retard and counterclockwise for advance.
4. Increase engine speed. The vacuum advance
should be at full retard position but should
advance readily when the engine speed is in
creased.
To set the timing without a timing light, re-
move No. 1 spark plug and crank engine until No.
1 piston starts up on compression stroke. Continue
cranking until long line on dampener lines up with
pointer. Loosen distributor quadrant screw and
rotate distributor clockwise to the limit of the slot
in the quadrant. Remove secondary wire from
center of distributor cap and hold bare end of wire
about 1/8" from the cylinder head. With ignition
switch on, slowly rotate the distributor counter-
clockwise just until a spark jumps from the wire to
the cylinder head; then tighten quadrant screw.
Spark setting may be advanced with fuels of
high octane rating.
Correct ignition timing is indicated by a slight
"ping" at about 15 M.P.H. when accelerating at full
throttle from 10 M.P.H. in high gear. If no "ping"
is heard, timing should be advanced one quadrant
graduation mark at a time until the "ping" is heard.
CRANKING VOLTAGE
1. Connect the negative voltmeter lead to the
starter switch terminal (where the battery to
starter cable is connected), Figure 6.
FIGURE 6
2. Connect the positive voltmeter lead to engine
for a ground.
3. With the ignition key off, engage the starter
motor and note the reading on the voltmeter.
The cranking voltage should read 5 volts or
more.
CAUTION: Crank engine intermittently (not
more than 30 seconds) to prevent starter motor
from overheating.
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