BENTLEY UE45771 Mulsanne Engine Crankshaft 6.75L L410I 3230

( Manufacturer Part Number: UE45771 ), ( Part Type: Engine Crankshaft ), ( Id: Mjc 2503230 ), ( Importapart: 314-502-3104 ), ( Country Of Origin: United Kingdom )

Review BENTLEY Mulsanne Silver 6.75l Engine Crankshaft fits SPUR RR 1985–1987

The **Bentley U.E.45771 1985 1987 Mulsanne Spur 6.75L L410I Engine Crankshaft (Part Number 3230)** is a meticulously crafted, high-performance component designed exclusively for the legendary Bentley Mulsanne, a symbol of British engineering excellence and automotive opulence. This crankshaft, forged from premium-grade forged steel, embodies the robust and enduring legacy of the L410I inline-six engine, which powered the Mulsanne s luxurious yet spirited performance during its golden era. Measuring precisely to the original specifications, this crankshaft features a **7-bolt main bearing cap design**, a hallmark of Bentley s commitment to structural integrity and smooth operation, ensuring minimal vibration and maximum durability even under the most demanding conditions. The **6.75-liter displacement** of the L410I engine, coupled with its overhead camshaft configuration and twin SU carburetors in later models, demanded a crankshaft capable of withstanding immense torque while maintaining flawless balance qualities this part delivers with precision. Whether restoring a classic Mulsanne to its former glory or upgrading an existing engine for enhanced reliability, this crankshaft serves as the backbone of the powerplant, offering a seamless fit with the original engine block, connecting rods, and ancillary components. Built to withstand the rigors of high-performance driving and long-term use, it is an essential replacement for engines exhibiting signs of wear, such as excessive endplay, unusual noise, or failure in critical components. With its **3230 part number**, this crankshaft aligns perfectly with Bentley s strict OEM standards, ensuring compatibility with the Mulsanne s iconic 1985 1987 model years, including both the **Series II (1985 1987)** and its refined iterations. For enthusiasts and mechanics alike, this part represents a fusion of heritage and engineering precision, embodying the spirit of a bygone era where luxury and power coexisted in perfect harmony.

### **Pros and Cons of Buying a Bentley Mulsanne Spur (1985 1987) with a 6.75L L410I Engine (Crankshaft #3230)**

#### **Pros**

1. **Iconic British Luxury and Prestige**

The Bentley Mulsanne Spur is one of the most prestigious and desirable classic cars from the 1980s. Its timeless design, hand-built craftsmanship, and association with British luxury make it a status symbol. Owning one places you in a select group of enthusiasts who appreciate rare automotive heritage.

2. **Strong, Reliable Engine (When Well-Maintained)**

The **6.75L L410I inline-six engine** (a development of the Rolls-Royce Silver Spirit engine) is a robust powerplant when properly maintained. It produces **250 275 hp** (depending on tuning) and is known for its smooth, torquey performance, especially in a car of this era. With regular servicing, it can last well beyond 100,000 miles.

3. **Classic Bentley Driving Experience**

The Mulsanne Spur offers a **luxurious, high-revving, and engaging** driving experience. The manual transmission (if fitted) provides a satisfying connection to the engine, while the automatic offers smooth, refined gear changes. The car s weight (around **4,500 5,000 lbs**) gives it a commanding road presence and a gentle, floating ride.

4. **Potential for Restoration and Customization**

Bentley parts, especially for this era, can be **expensive but available** through specialist suppliers. While not as common as modern parts, the aftermarket for classic Bentleys is growing, offering opportunities for **restoration, tuning, or even engine swaps** (e.g., a more modern V8 or turbocharged inline-six). Some owners have successfully converted these cars into **high-performance luxury machines**.

5. **Investment Potential (If Well-Documented)**

Properly maintained examples, especially those with **full service records, originality, and low mileage**, can appreciate in value over time. The **1985 1987 Mulsanne Spur** is not as common as later models, making rare, well-kept examples more desirable to collectors.

6. **Exclusivity and Community**

Owning a Bentley from this era means joining a **small but passionate community** of enthusiasts. Clubs like the **Bentley Owners Club (BOC)** and **Rolls-Royce & Bentley Owners Club (RRBOC)** provide networking, support, and shared knowledge. This can be invaluable for maintenance, restoration, and even social events.

7. **Potential for Low-Cost Running (If Neglected)**

Some owners have found that **abandoned or poorly maintained** examples can be purchased cheaply and restored at a lower cost than modern luxury cars. However, this is a **high-risk strategy** many of these cars suffer from **hidden mechanical issues** that require significant investment.

---

#### **Cons**

1. **Extremely High Maintenance and Repair Costs**

Bentley parts, labor, and specialist knowledge are **expensive**. A **6.75L L410I engine rebuild** can cost **$10,000 $20,000 **, depending on labor and parts. Common issues include:

- **Timing chain and tensioner wear** (can lead to catastrophic failure if ignored).

- **Water pump and thermostat failures** (common in these engines).

- **Suspension and steering components** (Bentley s heavy weight stresses bushings and joints).

- **Electrical gremlins** (1980s wiring can be finicky, especially with modern electronics).

2. **Rust and Structural Corrosion**

Many **1985 1987 Mulsannes** were built with **poor-quality body panels** that rust easily, particularly in the **floor pans, sills, and rear quarters**. A full **body-off rust treatment** can cost **$5,000 $15,000 **, depending on the extent of damage.

3. **Engine-Specific Issues (Crankshaft #3230)**

- **Unknown service history** if the crank was previously damaged, it may have been **poorly repaired**, leading to future issues.

- **Balancing concerns** some aftermarket cranks are not perfectly balanced, which can cause **vibration and premature wear** in the bearings.

- **Lifespan uncertainty** while strong, **6.75L L410I engines are not built for modern longevity** without significant modifications (e.g., turbocharging, fuel injection upgrades).

4. **Fuel and Emissions Compliance**

- **Lead-free fuel** (required by modern standards) can **damage the catalytic converter** if the car was previously run on leaded fuel.

- **Smog and emissions testing** may be required in some regions, adding to ownership costs.

- **Retrofitting modern emissions systems** can be **expensive and complex**.

5. **Driving Practicality and Modern Limitations**

- **Poor fuel economy** ( **10 12 MPG** in manual, slightly better in auto).

- **No modern safety features** (no ABS, traction control, or airbags original cars had **no front airbags** until 1988).

- **Difficulty in daily use** parking, city driving, and modern traffic can be **frustrating** due to size, visibility, and manual handling.

- **Insurance costs** can be **extremely high** (especially in the U.S. or UK), often **$3,000 $6,000 per year** for a restored example.

6. **Parts Availability and Lead Times**

- **Original Bentley parts** (especially for this era) are **discontinued** and must be sourced from **specialist suppliers**, which can take **months**.

- **Replacement parts** (e.g., timing chains, water pumps, suspension components) may require **custom machining or imports from the UK/Europe**.

- **Electrical components** (starter motors, alternators, wiring harnesses) are **notoriously difficult to find** and often require **restoration or replacement**.

7. **Potential for Hidden Mechanical Problems**

- **Timing chain stretch** (common in these engines) can lead to **valve damage** if not caught early.

- **Water pump failures** often go undetected until **overheating or coolant leaks** occur.

- **Suspension and steering wear** (ball joints, tie rods, bushings) can make the car **dangerous to drive** if neglected.

- **Transmission issues** (especially in automatic models) can be **expensive to repair**.

8. **Depreciation Risk**

While some classic Bentleys appreciate, **most do not**. A **fully restored, concours-level Mulsanne Spur** may hold value, but a **project car or poorly maintained example** will **lose value quickly**. The **resale market is niche**, and finding a buyer can be **difficult and time-consuming**.

9. **Time and Labor Intensive**

- **Restoration projects** can take **years** to complete properly.

- **Maintenance requires specialist knowledge** many mechanics **won t touch a Bentley** without proper training.

- **Storage and transport** are costly (garage storage, towing, or shipping can add up).

10. **Ethical and Practical Concerns**

- **Should you buy a "project car"?** If the car is **beyond repair or has been abused**, buying it may be **unethical** if you don t have the means to restore it properly.

- **Environmental impact** these cars are **not eco-friendly** by modern standards, which may be a concern for some buyers.

---

### **Ending Conclusion**

- **Loves classic luxury automobiles** and appreciates their history.

- **Has deep pockets** and is prepared for **high maintenance costs**.

- **Enjoys restoration projects** and doesn t mind spending **years** bringing the car to perfection.

- **Understands the risks** and is willing to **accept that this is not a "set-and-forget" vehicle**.

- **Casual drivers** who want a **modern, reliable, and affordable** luxury car.

- **Those who cannot afford** the **hidden costs** of restoration and upkeep.

- **Buyers who prioritize** **safety, fuel efficiency, and low insurance** over heritage and prestige.

### **Recommendation**

You have **verified the engine s history** (full service records, no major damage to the crankshaft).

You are **financially prepared** for **$50,000 $100,000 ** in restoration costs

Details:

This was carefully removed and is in good used condition. The flywheel bolts hole threads are in good condition, and the oil pump drive gear is attached included. Fits 1985 - 1987 Bentley Mulsanne and Rolls Royce Silver Spur with 6.75L v8 engine. Engine crankshaft from a 1987 Bentley Mulsanne.

The main journals measure out to 67.00mm 2.638 , and the rod 57.12mm 2.249. No shipping outside the lower 48 states. The journals have very minor scoring in a couple areas just barely enough to grab fingernail.

part #: ue45771 prices

• $149.99-$490.20

specifications cranshafengin:

• for models: Rr, Spur
• for makes: Bentley
• for years: 1985-1987
• mpn: Ue45771
• part type: Engine Crankshaft
• id: Mjc 2503230
• importapart: 314-502-3104
• country of origin: United Kingdom

offer cranshafengin:

• best offers: True
• started: April 12, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock
• quantity: 1

shipping cranshafengin:

• cost: $80.00
• service: Standard
• class: Standard
• transit: 3-5 Days
• type: Fixed

returns cranshafengin:

• paid by: Buyer
• time: 60 Days
• policy: Returns Accepted

general cranshafengin:

• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts

payments cranshafengin:

• other
• credit card: Discover
• wallet: Google-pay

seller cranshafengin:

• # reviews: 41893
• city: Hazelwood, Missouri
• rating: 100.0%

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