Ignition Timing; Rotor In No. 1 Firing Position - Pontiac Grand Prix Service Manual

ENGINE BLBCTRIGU
6E-19
5. Attach distributor to coil primary wire.
6. Replace distributor cap.
7. Adjust dwell and timing and then tighten distributor
clamp screw.
8. Attach vacuum line to distributor.
If engine was turned with distributor removed and/or
position of rotor was not noted upon removal of
distributor, it may be installed by the following
method.
1. Remove No. 1 spark plug (forward plug on left
bank on V-8).
2. Place finger in spark plug hole and turn engine over
until timing mark is at index (see Fig. 6E-34).
NOTE: As enpine a ~ ~ r o a c h e s t i m i n ~ mark, a pressure
should be felt Z t h th;3nger in the spirk plug hile. If no
pressure is felt, it will be necessary to turn the engine one
complete revolution and again index with timing marks.
3. Install distributor in position as shown in Fig. 6E-31.
It will be necessary to rotate rotor slightly to the right
for a V-8 and to the left for a 6-cyl. when attempting
installation so that final positon will be correct.
NOTE: If distributor does not drop into position fully,
hold down on housing and rotate engine until distributor
drops into position.
IGNITION TIMING
Correct timing marks are on the front engine covers
and harmonic balancer (Figs. 6E-33,6E-34).
Due to vacuum advance at idle, it is imperative to
disconnect distributor vacuum advance line before
setting ignition timing.
Fig. 6E-32 Rotor in No. 1 Firing Position
-
6 cylinder
At time spark is adjusted, the general appearance of
breaker points should be observed. -If smudge line
appears on point support and breaker plate just
beneath points, burned points (from oil or crankcase
vapor between points) are wry probable. Points which
have gone several thousand miles will have a rough
surface, but this does not mean points are worn out.
The roughness between points matches so that a large
contact area is maintained and points will continue to
provide satisfactory service. If dirt or scale is present,
p i n t s should be cleaned with a few strokes of a clean,
fine-cut, contact file. Do not attempt to remove all
roughness or dress point surfaces down smooth. Never
use emery cloth or sandpaper to clean points. If points
are burned or badly pitted, they should be replaced
and cause of this condition found and corrected. If this
is not done, new points will also bum and pit in a
short time.
Fig. 6E-31 Rotor in No. 1 Firing Position
-
V-8 Fig. 6E-33 Timing Marks on 6 Cylinder Engine