Buick LeSabre 1965 Service Manual page 609

ELECTRICAL SYSTEMS
IGNITION TIMING 1 0 - 3 9
VACUUM UNIT
AND ROTOR ON
TIMING POSITION
FOR NO. 1 CYLINDER
Figure 10-40—Locating Leads
in Distributor
Figure 10-42—Ignition Timing Mark
and lndicator-300 Engine
Figure 10-44—Installing Distributor
in 300 Engine
(marked "0"), "5" degrees, and
"12" degrees before U.D.C. See
Figure 10-43.
On 300 engines, the timing indi-
cator is marked "0", "5",
and "15". See Figure 10-42.
10"
Correct timing exists when the
yellow timing mark on the har-
monic balancer is halfway be-
tween the "0" and the "5" degree
marks on the timing indicator,
with the engine running at correct
idle speed (vacuum hose discon-
nected). Dual 4-barrel cars with
automatic transmission are timed
at 12 degrees.
a. Preliminary Timing
(Engine Won't Run)
CAUTION: If the engine must be
cranked from under the hood or
under the car to change its ro-
tational position for any assembly
operation, this cranking can only
be done in the "ACC." position.
Since the ignition system primary
is grounded inside the ignition
switch in the "LOCK" position,
energizing the starter will cause
damage to this ground contact in
the ignition switch.
To time the ignition on any engine
which will run, use subparagraph
b only. However, if the timing of
an engine is completely off, the
following procedure must first be
used to get the engine to run.
1. With rocker arm cover for
No. 1 cylinder removed, rotate
crankshaft in a forward direction
using a suitable wrench on the
harmonic balancer to crankshaft
bolt. Continue rotation until both
valves for No. 1 cylinder are
completely closed and the timing
mark on balancer is aligned with
the proper mark on timing indi-
cator. See Figure 10-42 or 10-43.
No. 1 cylinder is now in position
to fire.
2. Install distributor in engine
with rotor in position to fire No. 1
cylinder and with vacuum control
in position to connect vacuum
hose. See Figure 10-44 or 10-45.
Install distributor clamp and bolt
with lock washer, leaving bolt just
loose enough to permit movement
of distributor with heavy hand
pressure. NOTE: If distributor
does not seat in engine block,
press down lightly on distributor
Figure 10-41—Adjusting Contact
Point Dwell Angle
Figure 10-43—Ignition Timing Mark
and lndicator-401 and 425 Engines
Figure 10-45—Installing Distributor
in 401 and 425 Engines