A Guide to the Ignition Lock Cylinder for the 1966-1978 Mercury Capri
Having trouble starting your classic Capri? Your ignition lock cylinder might be the culprit.
- Failure is almost always due to simple mechanical wear over many years of use.
- Replacement is a straightforward DIY task if you have the key; it requires drilling if the key is lost.
- New aftermarket parts from brands like Standard Ignition or Dorman are the only practical options available.
- Verify the correct part for your Capri's specific year, as there are differences between early (1970-72) and later (1973-77) models.
Is Your Ignition Lock Cylinder Failing?
On a classic car like the Mercury Capri, the ignition lock cylinder is a purely mechanical part that sees a lot of use. After thousands of key turns, the internal pins and the cylinder itself can wear down. This wear and tear is the most common reason for failure. You might notice the key feels loose, is hard to insert, or won't turn smoothly. In some cases, the car may not start at all, or you might have trouble powering on accessories.
Key Symptoms of a Bad Ignition Lock Cylinder
- Key is difficult to insert or remove: You have to jiggle the key to get it in or out.
- Key won't turn: The key goes in but is stuck and won't rotate to the 'On' or 'Start' position.
- Car won't start: You can turn the key, but nothing happens, or it only works sometimes.
- Engine stalls while driving: A severely worn cylinder can lose contact with the ignition switch, shutting the car off. This is a serious safety issue.
Choosing the Right Aftermarket Part
For a 1966-1978 Mercury Capri, finding a New Old Stock (NOS) or original Ford part is nearly impossible. The market today consists of new aftermarket parts. These are your most practical and affordable options. The two most common brands you will find are Dorman and Standard Ignition (SMP).
- Standard Ignition (SMP): Often considered a higher-quality aftermarket brand, SMP parts are a solid choice for reliability. They are a good option if you plan on driving your Capri regularly.
- Dorman: Dorman produces a huge variety of replacement parts and is known for being widely available and affordable. While some professional mechanics have noted inconsistent quality on certain Dorman parts, for a simple mechanical component like this, it can be a perfectly acceptable budget-friendly choice.
Pro Tip: Since the part is relatively inexpensive, spending a few extra dollars for a brand like Standard Ignition may provide better long-term peace of mind. Also, be aware of year splits. Some parts fit 1970-1972 models, while others fit 1973-1977 models, so confirm your vehicle's production date.
Cost to Replace a Mercury Capri Ignition Lock Cylinder
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Part | $21 - $36 |
| Shop Labor | $80 - $150 |
| Total Estimated Cost | $101 - $186 |
Note: Costs are estimates and can vary based on your location and the specific repair shop. New OEM parts are generally not available for this vehicle.
Frequently Asked Questions
Can I replace the ignition lock cylinder myself?
Yes, this is a very DIY-friendly job for most owners with basic tools. The process typically involves removing the plastic shrouds around the steering column, inserting the key and turning it to the 'On' position, and then depressing a small retaining pin to release the cylinder. The new one slides in, and the process is reversed. The entire job usually takes less than an hour.
What if I don't have the key?
If you've lost the key, you cannot turn the cylinder to the 'On' position to press the release pin. In this case, the old cylinder must be drilled out. This is a more involved process and requires care to avoid damaging the steering column housing. If you are not comfortable with this, it is best to have a professional do the work.
Will I need new keys?
Yes. New aftermarket ignition lock cylinders always come with a new set of keys that are matched to the new cylinder. You will not be able to use your old keys with the new cylinder.
Are there any recalls for this part on a 1966-1978 Capri?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no recalls or investigations related to the ignition lock cylinder for the 1970-1978 Mercury Capri. Any recalls found for the Mercury Capri nameplate are for much later model years.
Technical Specifications
OEM Part Numbers: D4AZ-11582-A
Mechanical, key-operated lock cylinder. Includes cylinder, gasket, and two new keys. Does not include the electrical ignition switch, which is a separate part.
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.