Chevrolet 1980 Light Duty Truck Service Manual page 236

3B 4-22 STEERING CO LUM NS
DISASSEMBLE
1. Place lock in "run".
Rem ove lock plate, turn signal switch and bu zzer switch (see
service m anual.)
R em ove screw & lock cylinder.
on removal, it c o u ld fall into the colum n, req uirin g com plete
disassem bly to retrieve the screw.
H O U S IN G
Replacement
1. Remove the steering wheel as outlined under
"Steering Wheel - Removal".
2. Remove the directional signal switch as outlined
under "Directional Signal Switch - Removal".
It is not necessary to completely remove the directional
signal switch from the column. Pull the switch rearward far
enough to slip it over the end of the shaft - do not pull the
harness out of the column.
3. Refer to Fig. 3B4-31 for details on replacement of
lock cylinder.
IG NITIO N S W ITC H
The ignition switch is mounted on top of the column
jacket near the front of the dash. For anti-theft reasons, the
switch is located inside the channel section of the brake
pedal support and is completely inaccessible without first
lowering the steering column (see steering column removal).
The switch is actuated by a rod and rack assembly. A
portion of the rack is toothed and engages a gear on the end
of the lock cylinder, thus enabling the rod and rack to be
moved axially (with respect to the column) to actuate the
switch when the lock cylinder is rotated.
Removal
1. Lower the steering column as outlined under
"Steering Column Removal" later in this section. It is not
necessary to remove the steering wheel.
If the steering column is not removed from the vehicle,
be sure that it is properly supported, before proceeding.
2. The switch should be positioned in "Lock" position
before removing. If the lock cylinder has already been
removed, the actuating rod to the switch should be pulled
up until there is a definite stop, then moved down one
LOCK CYLINDER INSTALLATION
CAUTION: If screw is dropped
LO C K
C Y L IN D E R
S E T
Fig. 3B4-3 1-Lock Cylinder Removal
ASSEMBLE
1. R otate as show n, align c ylin d er key w ith keyw ay in housing.
2. Push lock all the w a y in.
3. Install screw. Tig h te n to 4.5 N -m for reg ular co lu m n s —
2.5 N *m for adju stable colum ns.
rx
■ T o assem ble — R otate to
\
stop w h ile holding cylinder.
C Y L IN D E R KEY
L O C K R E T A IN IN G S C R E W
detent, which is the "Lock" position.
3. Remove the two switch screws and remove the
switch assembly.
Installation
1. Before replacing the switch, be sure that the lock
is in the "Lock" position (Fig. 3B4-32); if it is not, a
screwdriver (placed in the locking rod slot) can be used to
move the switch to "Lock".
2. Install the activating rod into the switch and
assemble the switch on the column; tighten the mounting
screws.
SW ITCH IN LO CK P O S ITIO N
Fig. 3B4-32~lgnition Switch Assembly
LIG H T T R U C K S E R V IC E M ANUAL