GMC 1982 Light Duty Truck Service Manual page 310

3B4-22 STEERING COLUMNS
DISA SSEM B LE
1. Place lock in "run".
2. Remove lock plate, turn signal switch and buzzer switch (see
service manual.)
3. Remove screw & lock cylinder. C A U TIO N :
on removal, it could fall into the column, requiring complete
disassembly 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 o f 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 N IT IO N S W IT C H
The ignition switch is mounted on top o f 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
1. Rotate as shown, align cylinder key with keyway in housing.
2. Push lock all the way in.
3. Install screw. Tighten to 4.5 N -m for regular colum ns—
If screw is dropped
2.5 N*m for adjustable columns.
LOCK
CYLIN D ER
SET
Fig. 3B4-31--Lock Cylinder Removal
detent, which is the "Lock" position.
switch assembly.
Installation
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".
assemble the switch on the column; tighten the mounting
screws.
ASSEMBLE
•T o assemble — Rotate to
t stop while holding cylinder.
C Y LIN D E R KEY
LOCK R E TA IN IN G SCREW
3. Remove the two switch screws and remove the
1. Before replacing the switch, be sure that the lock
2. Install the activating rod into the switch and
SWITCH IN LOCK POSITION
Fig. 3 B 4 -3 2 ~ lg n itio n S w itch A ssem bly