Q: How do I remove and install an ignition lock cylinder on Lincoln Mark VII?
A: Disconnect the cable from the negative battery terminal. Turn the lock cylinder to the Run position. Insert an 1/8-inch punch into the hole at the bottom of the casting surrounding the lock cylinder. Depress the punch while pulling out on the lock cylinder to remove It from the column housing. To remove the ignition lock cylinder, place the key in the "RUN" position, push in on the release tab with a screwdriver and pull the cylinder straight out. Install the lock cylinder by turning it to the Run position and depressing the retaining pin. Insert the lock cylinder into the lock cylinder housing. Make sure the cylinder is completely seated and aligned in the interlocking washer before turning the key to the Off position. This will permit the retaining pin to extend into the hole. Tum the lock to ensure that operation is correct in all positions. The remainder of installation is the reverse of removal.