GM Chevy Mid-Size Cars 1964-1988 Repair Guide

Lock Cylinder

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REMOVAL & INSTALLATION



See Figures 1 and 2

The ignition switch on most Chevrolet mid-sized vehicles is located on the steering column. Some earlier models were equipped with a dash-mounted switch. For earlier vehicles, please refer to the procedure in Chassis Electrical of this guide.

  1. Disconnect the negative battery cable.
  2.  
  3. Matchmark and remove the steering wheel.
  4.  
  5. Remove the turn signal assembly from the steering column. For details, refer to the procedure earlier in this section.
  6.  

It is not necessary to pull the turn signal wiring harness out of the column, instead, allow the switch to hang from the wires out of the way.

  1. Place the lock cylinder in LOCK for vehicle up to 1970, or RUN for 1971 and later vehicles.
  2.  
  3. For most vehicles 1979 and later the switch is retained using a screw. Loosen and remove the retaining screw, taking great care not to drop it into the column (which would require column disassembly), then remove the lock cylinder assembly from the steering column.
  4.  
  5. For most vehicles through 1978 a retaining latch and snapring is used instead of the retaining screw. Insert a sturdy screwdriver or small prytool into the turn signal housing slot. Keeping the tool to the right side of the slot, break the housing flash loose and depress the spring latch at the lower end of the lock cylinder. Remove the lock cylinder.
  6.  

Considerable force may be necessary to break this casting flash, but be careful not to damage any other parts. When ordering a new lock cylinder, specify a cylinder assembly. This will save assembling the cylinder washer, sleeve, and adaptor.

To install:
  1. For vehicles through 1978 that are not equipped with a retaining screw, hold the lock cylinder sleeve and rotate the knob clockwise against the stop. Insert the cylinder into the housing, aligning the key and keyway. For 1969-76 vehicles hold a 0.070 in. (1.78mm) drill between the lock bezel and the housing. For all vehicles through 1978, push the cylinder into abutment of cylinder and sector. Rotate the cylinder counterclockwise, maintaining a light pressure until the drive section of the cylinder mates with the sector. Push in until the snapring pops into the grooves. If used, remove the drill. Check the operation of the cylinder.
  2.  
  3. For most vehicles 1979 and later, insert the lock cylinder assembly to the steering column, then install and tighten the retaining screw.
  4.  
  5. Install the turn signal assembly.
  6.  
  7. Align the matchmarks and install the steering wheel.
  8.  
  9. Connect the negative battery cable.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: For most 1978 and earlier vehicles, depress the lock cylinder spring latch through the slot in the turn signal housing



Click image to see an enlarged view

Fig. Fig. 2: Lock cylinder removal-1979 and later vehicle equipped with a cylinder retaining screw

 
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