GM Firebird 1967-1981 Repair Guide

Lock Cylinder



See Figures 1 and 2

Click image to see an enlarged view

Fig. Fig. 1: Lock cylinder removal and installation procedure 1979 model shown, other years are similar

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Fig. Fig. 2: Exploded view of the ignition lock assembly

  1. Remove the steering wheel and the directional signal switch. It is not necessary to pull the wiring harness out of the column. See the applicable procedures above.
  3. Place the lock cylinder in LOCK (up to 1970) or RUN (1971-81 models).
  5. Insert a small prytool into the turn signal housing slot. Keeping the prytool 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 washer, sleeve, and adaptor.

To install:
  1. 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 cars hold a 0.070 in. drill between the lock bezel and the housing. On 1977-81 cars, 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 the steering wheel.