Mercury Cyclone Ignition Lock Cylinder Guide (1964-1971)
If your Cyclone's key is sticking or won't turn, the fix is easier and cheaper than you think.
- Replacement is a very simple 10-minute job if your key still turns, only requiring a paperclip.
- If your key is stuck, the cylinder must be drilled out, a job best left to a locksmith.
- A new lock cylinder will come with a new set of keys; your original keys will no longer work in the ignition.
- Standard Ignition (SMP) is a premium aftermarket choice, while Dorman is a reliable standard option.
Is Your Ignition Lock Cylinder Failing?
After 50+ years of use, the small metal tumblers inside the ignition lock cylinder wear down. This is the most common reason for failure on a classic car like the Cyclone. Symptoms usually start small and get worse, but ignoring them can eventually leave you stranded. Look for these common signs:
- Key is hard to insert or remove: You have to jiggle or force the key to get it in or out of the ignition.
- Key won't turn: This is the most frequent complaint. The key gets stuck and won't move to the 'ON' or 'START' positions.
- Car won't start: You can turn the key, but nothing happens, or the engine doesn't crank. This can happen if the cylinder isn't fully engaging the ignition switch behind it.
- Intermittent starting issues: Sometimes it works, sometimes it doesn't. This is a clear sign of a worn-out internal mechanism.
Choosing the Right Aftermarket Cylinder
For a vehicle from the 1964-1971 model years, new original Ford (OEM) parts are no longer available. The market consists entirely of new aftermarket reproductions. These parts are affordable and readily available. Your choice comes down to brand reputation.
All aftermarket lock cylinders will come with a new set of keys. Your original keys for the door and trunk will no longer work in the new ignition.
Aftermarket Brand Tiers
| Brand | Tier | Our Assessment |
|---|---|---|
| Standard Ignition (SMP) | Premium Aftermarket | Standard Motor Products is widely considered a top-tier aftermarket brand, known for quality components. For classic cars, many enthusiasts and mechanics choose SMP when they want the best available replacement part. |
| Dorman | Standard Aftermarket | Dorman provides reliable, cost-effective replacement parts that are engineered to match the fit and function of the original. It's a trustworthy choice for a standard repair. |
Simple DIY Installation Guide
If you have a key that still turns, this is one of the easiest jobs you can do on your Cyclone. It requires no special tools and takes less than 15 minutes.
Pro-Tip: The only tool you need is a paperclip or a small nail to depress the retaining pin.
- Disconnect the Battery: As a safety precaution, disconnect the negative battery terminal.
- Turn Key to 'ACC': Insert your old key and turn it counter-clockwise to the 'Accessory' position. This is the only position where the cylinder can be removed.
- Depress Retaining Pin: Locate the small pinhole on the face of the chrome cylinder housing. Push the paperclip into this hole to depress the spring-loaded retaining pin.
- Remove Old Cylinder: While holding the pin down, pull the key and the entire lock cylinder straight out of the housing.
- Install New Cylinder: Take the new cylinder (with its new key inserted and turned to the 'ACC' position), line up the tab, and slide it into the housing until it clicks and locks in place.
- Test: Turn the key through all positions ('OFF', 'ACC', 'ON', 'START') to ensure it operates smoothly before reconnecting the battery.
What If Your Key Is Stuck and Won't Turn?
If your key is completely seized, you cannot use the standard pin-release method. This happens when the internal tumblers are broken or jammed. The only way to remove the cylinder is to drill it out. This process destroys the old cylinder to allow removal. It is highly recommended to have an automotive locksmith perform this task to avoid damaging the steering column or dash housing.
Frequently Asked Questions
Will my original keys work with the new lock cylinder?
No. A new aftermarket ignition lock cylinder comes with a new, unique set of keys. You will need to use this new key for the ignition and continue using your old key for the doors and trunk.
Is this a difficult repair to do myself?
If you have a working key that can turn, this is a very easy, 10-minute job for any DIYer. If the key is stuck, the difficulty increases significantly, and a professional is recommended.
Are there any recalls for the 1964-1971 Mercury Cyclone ignition?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no recalls for the ignition lock cylinder on these vehicles. Any failure is due to the age and normal wear of the mechanical parts.
Should I try lubricating the old cylinder first?
You can try spraying a small amount of dry graphite lubricant into the keyhole. However, if the internal pins are already heavily worn or broken, this is a temporary fix at best and will not solve the underlying problem. Replacement is the only permanent solution for a worn-out cylinder.
Technical Specifications
OEM Part Numbers: D0AZ-11582-B
Mechanical tumbler lock cylinder with pin-release mechanism. No electronic components.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.