Chevrolet Light - Page 33

Reassemble the distributor cap
and spark plug wires. Make sure that
all terminals of the primary wire at
the ignition coil and distributor are
clean and tight.
Ignition Timing. Set the octane se-
lector at "0" on the scale (fig. 37),
and attach a Neon Timing Light to
No. 1 spark plug. Start the engin~
and run it at idling speed. Loosen
distributor clamp and rotate the dis-
tributor body clockwise or counter-
clockwise until the steel ball in the
flywheel lines up with the pointer
on the flywheel housing. Tighten the
distributor clamp screw.
Octane Selector. When changing to a grade of fuel with a
higher or lower octane rating it may be advisable to advance
or retard the spark slightly. Advance the spark to take advan-
tage of higher octane fuel and retard it to prevent excessive
detonation with lower octane rated fuels. Note the position of
the octane selector scale (fig. 37), loosen the clamp bolt and
move the distributor assembly toward advance or retard as
desired and tighten the clamp bolt securely. By adjusting the
spark in this manner it can be readjusted to the original set-
ting when desired without special ignition timing equipment.
Spark Plugs. Clean the spark plugs thoroughly , using an abra-
sive type cleaner. If the porcelains are badly glazed or blis-
tered, the spark plugs should be replaced. All spark plugs
must be of the same make and number or heat range.
. Adjust the spark gaps to .035",
fig. 38_SeHingSpa.k Plug Gap
using a round feeler gauge (fig. 38).
CAUTION; In adjusting the s park
plug g.p never bend the cente r
electrode
which extends through
the porcelain center; always make
adjustment by bending the side
electrode.
Install the spark plugs in the en-
gine,
using new gaskets.
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