Chevrolet Full-size Cars 1968-1978 Repair Guide

Lock Cylinder



1968 Vehicles
  1. Disconnect the negative battery cable.
  3. Reach under the dash and remove the electrical connectors from the ignition lock switch.
  5. Remove the ignition lock switch retaining clip from either the front or the rear of the assembly.
  7. Remove the ignition lock assembly from the vehicle.
  9. Installation is the reverse of the removal procedure.

1969-78 Vehicles

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Fig. Fig. 1 Removing the lock cylinder by depressing the spring latch

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Fig. Fig. 2 Removing the lock cylinder by unscrewing the lock retaining screw

  1. Disconnect the negative battery cable. Remove the steering wheel and the directional signal switch. It is not necessary to pull the wire harness out of the column. See the applicable procedures above.
  3. Place the lock cylinder in Lock (up to 1970), or Run (1971-78).
  5. Insert a small prybar into the turn signal housing slot. Keeping the screwdriver 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.

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.

  1. To install, hold the lock cylinder sleeve and rotate the knob clockwise against the stop. Insert the cylinder into the housing, aligning the key and keyway. On 1969-76 vehicles hold a 0.070" drill between the lock bezel and the housing. On 1977-78 vehicles, 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. Remove the drill. Check the operation of the cylinder. Install the direction signal switch and steering wheel.