0-4
1968
PONTIAC
SERVICE
MANUAL
the
window
division
channel.
Tire
to ground clear-
ance
should not exceed 6 inches
while
towing
the car
and
speeds
should not exceed 35 mph for
distances
up to 50 miles.
CAUTION;
Power
steering-equipped
cars
should
be
towed
with
caution,
since
there
is no
power
assist
with
the
engine
off.
CODING
SIDE
BAR LOCK
All
1968 Pontiacs, Tempests and Firebirds
will
have new type
lock
cylinders and keys (Fig. 0-9).
Two
separate
keys are used; type "C
n
(hexagonal)
for
ignition
switch, door locks and tailgate and type
"D"
(round) for the trunk and glove compartment.
The keys
will
not be interchangeable
with
each
other
or
with
those
used
prior
to 1968
because
of new
key way
design and an increased number of
biting
depths.
stamped on its side. Before the
lock
cylinder may
be coded, the correct code must be determined. If
the numbered blank in the key head has not been
removed, determine the code by consulting the
lock
manufacturer's code book. Should the blank be miss-
ing,
proceed as
follows;
1.
Place
the key on the silhouette in Fig. 0-10,
aligning
the key
with
the outline as accurately as
possible.
2. Starting at the
base
of the key blade, determine
the lowest
level
visible in position No. 1.
3.
Determine the lowest visible
level
for the re-
maining
five
positions. As
each
tumbler
level
is
determined,
write
that number in the blank
space
above the position numbers.
After
the key code has been determined, the cor-
rect tumblers should be installed as
follows:
Locks
are available
without
tumblers, springs or
retainers. Uncoded side bar locks may be coded to
match the keys used on the car by ordering the above
parts separately. Five types of tumblers are used to
compose the various combinations and
each
is coded
according
to a number, one (1) through
five
(5),
1. Beginning
with
slot next to head of cylinder
(number one position)
install
tumblers in slots in
sequence
determined
from
key code.
2. Insert spring in
each
round cavity of
each
tumbler
lock
between slots.
NOTE:
Do not
pull
springs
apart;
unscrew
them.
C
KEY
FOR
IGNITION AND
DOOR
LOCKS,
USE
CODE
SERIES
0N00
TO
9N99 AND 0P00 TO
9P99.
D
KEY
FOR
REAR
COMPARTMENT
AND
GLOVE
COMPARTMENT
LOCKS,
USE
CODE
SERIES
0R00
TO
9R99
AND 0T00 TO
9T99.
3.
Install
spring retainer over springs
with
ends
inserted in slots, and
hold
in place.
4. Check by inserting cut key. Side bar
will
drop
in
place when key is inserted if correct tumblers
have been installed.
5. Stake spring retainer in place using small
punch and
light
hammer.
POSITION
123456
LEVEL
2 3 4 5
Fig. 0-9 Key Blanks
Fig. 0-10 Key
Coding
Diagram
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