MERCURY D4OF-17504-AA-AD4AF-17504-AA Depressed Wiper Motor

( Brand: Mercury ), ( Manufacturer Part Number: D4OF-17504-AA-AD4AF-17504-AA ), ( Type: Wiper Motor ), ( Oe/oem Part Number: D4af-17a429-aa, D9az-17508--a, D7oz-17508-a ), ( Material: D7ly-17508-a, D7hz-17508-a, D7az-17508-a, D4sz-17508-a, D4pf-17504-aa, D4az-17508-a ), ( Country Of Origin: United States )

Review MERCURY Ford Depressed Wiper Motor Lincoln fits PARK TORINO THUNDERBIRD 1974–1981

The **Mercury D4OF-17504-AA (1974 1981 Ford Depressed Park Wiper Motor)** is a meticulously engineered, high-performance windshield wiper motor designed exclusively for classic Ford, Lincoln, and Mercury vehicles from the mid-1970s, including the iconic **Ford Thunderbird, Mercury Cougar, and Lincoln Continental** models. This motor is specifically engineered to address the unique mechanical challenges posed by the **"depressed park"** wiper mechanism, a feature common in these vehicles where the wiper arms retract downward into a recessed position when the ignition is turned off or shifted into "Park." Unlike standard wiper motors, the D4OF-17504-AA incorporates a specialized **depressed park linkage system**, ensuring smooth, reliable operation while preventing premature wear or binding that can occur in older motors with worn or corroded internals.

Constructed with durable **cast aluminum housing** and reinforced internal components, this motor is built to withstand the demands of daily use without sacrificing precision. The **permanent magnet DC motor** delivers consistent torque and speed, driving the wiper linkage through a robust **gear train** that minimizes backlash and ensures smooth, synchronized movement. The motor s **intermittent wipe function** is fully operational, allowing for adjustable delay settings to match the driver s preferences, while the **dual-speed operation** (low and high) provides flexibility for varying weather conditions. The **worm gear drive mechanism** is particularly noteworthy, as it reduces the risk of slippage and ensures the wipers return to their exact starting position with each cycle, a critical feature for maintaining visibility and preventing streaking on the windshield.

Compatibility with **1974 1981 Ford Thunderbird, Mercury Cougar, and Lincoln Continental** models is seamless, as this motor is designed to integrate directly with the vehicle s original wiring harness and mounting bracket, requiring no modifications to the existing system. The **O-ring sealed motor housing** protects against dust, moisture, and corrosion, extending the motor s lifespan even in harsh driving conditions. For restoration enthusiasts and classic car owners, this wiper motor represents a high-quality, direct-fit replacement that restores both functionality and authenticity to their vehicle s interior. Whether used in a meticulously restored show car or a daily-driven classic, the **Mercury D4OF-17504-AA** delivers the reliability and performance expected of a premium aftermarket component, ensuring clear visibility and effortless operation for decades to come.

### **Pros and Cons of Buying a 1974 1981 Ford Depressed Park Wiper Motor (Mercury D4OF-17504-AA, Lincoln/Torino/Thunderbird)**

#### **Pros**

1. **Common and Widely Available** This wiper motor is a standard component for several Ford models from the mid-1970s to early 1980s, meaning parts and replacements are easy to find. Dealers, salvage yards, and online marketplaces (e.g., eBay, RockAuto) frequently stock it.

2. **Proven Reliability** The D4OF-17504-AA motor is a well-known design from Ford s mid-70s lineup, which means it has been tested by many owners over decades. While not indestructible, it is durable enough for everyday use if maintained properly.

3. **Affordable Replacement Cost** Compared to modern wiper motors, this part is relatively inexpensive. A new or used unit typically costs between **$30 $80**, depending on condition and source. Labor costs are also low since it s a straightforward swap.

4. **Simple Installation** The motor is mounted in a way that allows for easy removal and replacement, even for a DIYer with basic mechanical skills. No specialized tools are usually required.

5. **Compatibility with Aftermarket Parts** Many aftermarket wiper blades, motors, and linkages are designed to fit this era of Ford vehicles, giving owners flexibility in upgrades (e.g., longer blades for better coverage).

6. **Classic Car Appeal** If you re restoring or maintaining a vintage Ford (Lincoln, Torino, Thunderbird), keeping original or period-correct parts like this motor enhances authenticity and resale value.

7. **Minimal Electrical Complexity** Unlike some modern motors with advanced features (e.g., intermittent wipers, rain sensors), this unit operates on a basic relay and switch system, reducing potential electrical failure points.

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#### **Cons**

1. **Aging and Wear** Motors from this era can develop **brush wear, corroded terminals, or failing solenoids** over time, especially if exposed to moisture or poor maintenance. The "depressed park" feature (where the wipers drop to a resting position) can also fail if the mechanism seizes.

2. **Common Failure Points**

- **Brushes** wear out and may cause intermittent operation or complete failure.

- **Gears or linkages** can become stiff or break, especially if the motor is left idle for long periods.

- **Corrosion** in the electrical connections (due to age and lack of modern corrosion protection) can cause intermittent power loss.

- **Intermittent wiper control** (common in modern vehicles).

- **Rain-sensing technology**.

- **Longer blade compatibility** (some aftermarket blades may not fit perfectly without modification).

4. **Potential for Water Intrusion** Older motors are less sealed than modern ones, meaning water or road grime can enter, causing corrosion or short circuits. Regular cleaning and lubrication are necessary.

5. **Difficulty Finding Exact Replacements** While the motor itself is common, **matching linkages, arms, and blades** may require sourcing from salvage yards or specialty suppliers. Some parts (e.g., specific linkage rods) can be hard to find in good condition.

6. **No Built-in Diagnostics** If the motor fails, troubleshooting often requires **visual inspection, multimeter testing, or trial-and-error replacement of components** (e.g., relays, switches). Modern vehicles typically have error codes for easier diagnosis.

7. **Environmental Factors** Extreme cold or heat can affect performance. In very cold climates, the motor may struggle to engage due to stiff linkages, while excessive heat can accelerate wear.

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### **Conclusion**

Buying a **1974 1981 Ford D4OF-17504-AA wiper motor** (or a replacement for it) is a **practical and cost-effective choice** for owners of classic Fords, provided you are prepared for potential maintenance. The motor is **reliable for daily use** if kept in good condition, but it is **not as durable or feature-rich as modern alternatives**. If you re restoring a vintage vehicle and prioritize **authenticity and low-cost parts**, this motor is a solid choice. However, if you want **long-term reliability without maintenance**, a **modern replacement motor** (e.g., a universal fit or aftermarket unit) may be worth the slightly higher cost.

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### **Recommendation**

- **Use the original or an exact replacement** (D4OF-17504-AA or equivalent) for authenticity.

- **Inspect and clean the motor** before installation, checking for corrosion, worn brushes, and loose connections.

- **Lubricate linkages** with silicone spray to prevent stiffness.

- **Consider upgrading blades** to longer, modern ones if coverage is an issue.

- **Replace the motor if it fails**, but **budget for potential future issues** (e.g., brush replacement every few years).

- **Keep spare brushes and a multimeter** for quick diagnostics.

- **Avoid leaving the wipers in an extended position** (e.g., on windshield) for long periods to prevent strain.

- **Upgrade to a modern universal-fit wiper motor** (e.g., from a 1990s Ford or aftermarket brands like **Delco, Dorman, or ACDelco**). While not period-correct, these motors offer **intermittent wipers, better sealing, and longer lifespan** for a slightly higher cost ( $50 $100).

- **Pair with modern blades** (e.g., **Bosch, Rain-X, or Visteon**) for better performance and longevity.

For **enthusiasts restoring or maintaining a vintage Ford**, the **D4OF-17504-AA motor is a reasonable and cost-effective choice** with proper care. For **modern daily drivers or those prioritizing convenience**, a **modern replacement motor** is the better long-term investment. Always **test the motor before installation** and **plan for occasional maintenance** to avoid unexpected failures.

Details:

1974-1981 Thunderbird Ford FULL SIZE. FILE PHOTO, Completely serviced any worn parts replaced and needed repairs done. ELITE 1974 1979. AMC MATADOR1974-1981.

TBIRD 1974-1979.

specifications winshielwip:

• for models: Park, Torino, Thunderbird
• for makes: Ford, Lincoln, Mercury
• for years: 1974-1981
• brand: Mercury
• mpn: D4of-17504-aa-ad4af-17504-aa
• type: Wiper Motor
• oe/oem part number: D4af-17a429-aa, D9az-17508--a, D7oz-17508-a
• material: D7ly-17508-a, D7hz-17508-a, D7az-17508-a, D4sz-17508-a, D4pf-17504-aa, D4az-17508-a
• country of origin: United States

offer winshielwip:

• quantity: 1
• started: May 2, 2026
• availability: In Stock
• options: Ship-to-home
• sold: 0

returns winshielwip:

• policy: No Returns

payments winshielwip:

• wallet: Paypal
• other
• credit card: Discover

general winshielwip:

• Exterior Parts Accessories > Wipers Washers > Wiper Linkages, Transmissions Motors
• condition: Used

seller winshielwip:

• # reviews: 27496
• rating: 100.0%
• city: Sherwood, Oregon

shipping winshielwip:

• type: Fixed
• service: USPS Ground Advantage
• cost: $19.95
• class: Standard
• transit: 7-11 Days
• carrier: USPS

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