Chevrolet 1977 light duty truck Service Manual page 240

Fig. 3B-59--lgm tion Lock Cylinder Installed in a Vise
Fig. 3 B -6 0 -In s ta llin g A dapter Ring
housing Hash loose and at the same time depress the
spring latch at the lower end of the lock cylinder. With
the latch depressed, the lock cylinder can be removed
from the housing.
Assembly (Fig. 3B-57)
1. Place the key part way into the lock cylinder
assembly. Place the wave w asher and anti-theft ring onto
the lower end of the lock cylinder.
N O TE : If the key is installed all the way into the
lock cylinder, the plastic keeper in the lock cylinder
protrudes and prevents installation o f the sleeve
assembly.
2. M ake sure that the plastic keeper in the sleeve
assembly protrudes from the sleeve (fig. 3B-58).
3. Align the lock bolt on the lock cylinder and the
tab on the anti-theft washer and the slot in the sleeve
assembly (fig. 3B-58). Push the sleeve all the way onto
1 / 8 " FLAT END
PUNCH
(4) DIMPLES
ADAPTER R IN G
A G A IN ST STEP
IN SLEEVE
the lock cylinder assembly, push the ignition key the rest
of the way in and rotate the lock cylinder clockwise.
4. Rotate the lock counter-clockwise into "L O C K "
position.
5. Place the lock in a brass jawed vise or between
two pieces o f wood (fig. 3B-59).
NOTE: If a vise is used, place cloth around the
knob to prevent m arring the knob surface.
6. Place the ad ap ter ring onto the lower end o f the
cylinder so that the finger o f the ad a p te r is located at the
step in the sleeve and the serrated edge o f the ad apter is
visiblle after assembly to the cylinder
"staking" (fig. 3B-60). The key must be free to rotate at
least 1/3 of a circle (120°).
NOTE: Tap the adapter onto the cylinder until it is
stopped at the bottom o f the cylinder flats (cylinder
will extend above ad apter approximately 1/16").
7. Using a small flat punch, at least
diameter, stake the lock cylinder over the adap ter ring in
four places just outboard o f the four dimples as shown in
Figure 3B-60.
8. Check lock operation before reinstalling vehicle.
Installation
1. Hold the lock cylinder sleeve and rotate the
knob clockwise against the stop. Insert the cylinder into
the housing bore with the key on the cylinder sleeve
aligned with the keyway in the housing. Push the
cylinder into abutm ent o f cylinder and sector. Hold an
.070" drill between the lock bezel and housing. Rotate
the cylinder counterclockwise,
pressure until the drive section o f the cylinder mates
with the sector. Push in until the snap ring pops into the
grooves and lock cylinder is secured in the housing.
Remove the .070" drill. Check lock cylinder for freedom
of rotation.
2. Install the Direction Signal Switch and Steering
Wheel as outlined previously in this section.
SWITCH IN LOCK POSITION
and before
1/8 " in
m a intaining a light