Disclaimer: This information is for guidance only. Improper procedures could damage your vehicle or cause injury. If you are not comfortable working on your vehicle's ignition system, take it to a qualified mechanic.
1. Preparation:
* Safety First: Disconnect the negative battery cable to prevent accidental shorts or electrical shocks.
* Tools: You'll need a variety of tools, including:
* Ignition switch removal tool: This specialized tool is crucial for removing the ignition cylinder without damaging it. It’s specifically designed to engage the retention clip. Don't try improvising; the wrong tool can be disastrous.
* Small flathead screwdriver: Possibly needed to help pry things loose carefully.
* Needle-nose pliers: Might be helpful for grabbing small parts.
* New ignition tumbler: Obtain the correct replacement for your 1971 Mustang. You'll need the correct key code or take the old cylinder (if you can remove it intact) to an automotive locksmith.
* Penetrating oil (like PB Blaster): Apply liberally to the ignition cylinder to help loosen things up. Let it soak for a while before attempting removal.
* Consult a Repair Manual: A shop manual specific to your 1971 Mustang is highly recommended. It will have detailed diagrams and instructions.
2. Removing the Ignition Cylinder:
* Access: You'll likely need to remove the steering column shroud (the plastic or metal cover around the steering column) to access the ignition cylinder. This typically involves removing screws and possibly some trim pieces. Your repair manual will guide you.
* Using the Removal Tool: This is where the specialized tool is essential. Carefully insert it into the ignition cylinder and follow the instructions that came with it. The tool will typically engage a retaining clip or ring that holds the cylinder in place. Once the clip is released, the cylinder should come out. This step is delicate – avoid excessive force.
* If the tool doesn't work: This is where things get complicated. You may need to drill out the broken key (a risky procedure that requires precision to avoid damaging the ignition cylinder). Only attempt this if you are very experienced with this type of repair. Improper drilling can permanently damage the ignition cylinder and require more extensive repair. An automotive locksmith is your best bet in this scenario.
3. Installing the New Ignition Cylinder:
* Installation: Once the old cylinder is removed, carefully install the new one using the reverse of the removal process. Ensure the retaining clip is properly engaged.
* Reconnect Battery: Reconnect the negative battery cable.
* Test: Try your new key to ensure everything works correctly.
If you cannot remove the broken key or ignition cylinder:
* Professional Locksmith: Your best option is to call a qualified automotive locksmith. They have the specialized tools and expertise to handle this situation without causing damage. They can often remove the broken key and install a new cylinder without requiring a complete steering column replacement.
Replacing the ignition tumbler is not a simple task, especially with a broken key. Unless you are experienced in automotive repair and have the necessary specialized tools, seeking professional help is strongly recommended to avoid costly damage. The cost of a professional repair will be less than the cost of damaged parts.
