MERCEDES 1170310701 Engine Crankshaft Benz 4.5L V8

( Manufacturer Part Number: 1170310701 ), ( Part Type: Engine Crankshaft ), ( Country Of Origin: Germany ), ( Oe/oem Part Number: 71 72 1972 73 1973 74 1974 75, 280se 280sel 300sel 450sl 450slc 450se 450sel, C107 Coupe Convertible Sedan, 4.5 117 1170100006 ), ( Vintage Part: No )

Review MERCEDES benz Engine Crankshaft 4.5l V8 Oem Nice fits W108 W109 W116 R107 M117 1971–1975

The **Mercedes-Benz 1170310701 engine crankshaft (4.5L M117 V8, 1971 1975, W108, W109, W116, R107)** is a meticulously engineered component designed to deliver the uncompromising performance and reliability synonymous with Mercedes-Benz s legendary engineering legacy. This forged steel crankshaft, part of the iconic **M117 V8 engine family**, was originally installed in a range of high-performance and luxury models, including the **280 SE, 300 SE, 450 SEL, and the legendary R107 450 SL roadster**, as well as the **W108 and W109 sedans and coupes**. Crafted from high-grade alloy steel, this crankshaft features precision-machined main and rod journals, ensuring smooth operation and optimal power transfer across the engine s **4.5-liter displacement**. The design incorporates **five main bearings** (two at the front, three at the rear) to support the crankshaft s balanced rotation, minimizing vibration and wear while maintaining the high torque output characteristic of the M117. The **counterweights** are strategically positioned to counteract the inertia forces generated by the V8 s rotating assembly, contributing to the engine s signature smoothness and durability. This crankshaft is a critical element in the **overhead camshaft (OHC) pushrod** architecture of the M117, where its precise machining and heat-treatment processes ensure longevity even under demanding conditions. Whether restoring a classic Mercedes-Benz or upgrading an existing engine, this **OEM-spec crankshaft** is an essential part for maintaining the original performance and character of these legendary powerplants. Its compatibility with the **W108 (250/280/300 SE), W109 (280/300/450 SEL), W116 (280/300/450 SEL), and R107 (450 SL)** models makes it a sought-after replacement for enthusiasts seeking authenticity and performance. With its robust construction and proven reliability, this crankshaft embodies the engineering excellence that defined Mercedes-Benz s golden era of V8 power.

The **Mercedes-Benz 117.031.070.1** part number refers to the **4.5L M117 V8 engine crankshaft** used in the **W108 (230/250/280/300/350/450/600)**, **W109 (280/300/350/450/600)**, **W116 (280/300/350/450/600)**, and **R107 (280/300/350/450/600)** models from **1971 1975**. Below is a detailed analysis of the pros and cons of purchasing this engine component, along with a conclusion and recommendation.

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### **Pros of Buying a Used/Aftermarket 4.5L M117 Crankshaft**

1. **Reliability of the M117 Engine**

- The **M117** is a robust, naturally aspirated V8 known for durability, especially in its later iterations (post-1971). Many examples with proper maintenance easily exceed **200,000 miles**.

- The **4.5L version** (introduced in 1971) was an upgrade over the smaller 3.5L M116, offering better power and torque while maintaining Mercedes-Benz s reputation for longevity.

2. **Availability of Parts and Support**

- As a classic but still moderately common engine, **crankshafts, bearings, and related components** are relatively easy to find, especially from European suppliers or reputable aftermarket vendors.

- **Mercedes-Benz dealerships and specialty shops** still service these models, ensuring compatibility with genuine parts when needed.

- **Aftermarket options** (e.g., **Crankshaft Position Sensors, harmonic balancers, and timing components**) are widely available at reasonable prices.

3. **Potential for Restoration and Performance**

- The **M117** is a favorite among enthusiasts for **restoration projects** due to its classic styling and strong power output (especially in **6.3L 350/450/600** variants).

- **Modifications** (e.g., **high-flow heads, performance camshafts, or forced induction**) are well-documented, allowing for meaningful upgrades without excessive cost.

- **Stock engines** in good condition can be **rebuilt and sold for profit**, especially in the classic car market.

4. **Lower Cost Compared to Modern Engines**

- Replacing a **failed crankshaft** in a modern Mercedes (e.g., M276, M279) can cost **$5,000 $10,000 **, whereas a **used or aftermarket M117 crankshaft** typically ranges from **$300 $1,200**, depending on condition and source.

- **Labor costs** for classic Mercedes are often lower than for newer models, making repairs more affordable.

5. **Nostalgia and Collectibility**

- Owners of **W108, W109, W116, or R107** models often seek **authentic, high-quality parts** to preserve or enhance their vehicles.

- A **well-maintained M117 engine** can be a **valuable asset** in the classic car market, especially if the car is in show condition.

6. **Compatibility with Classic Tuning**

- **High-performance camshafts** (e.g., **Merit, Comp Cams**)

- **Ported and polished heads** (common in **280/300/350** models)

- **Aftermarket intake manifolds** (e.g., **Weber, Holley**)

- **Turbocharging** (less common but possible with modifications)

- **Stock engines** can be **rebuilt to near-mint condition**, making them desirable for both daily driving and concours.

7. **Simpler Design Than Modern Engines**

- Unlike modern **turbocharged, direct-injection engines**, the **M117** has a **relatively straightforward design**, making **DIY repairs** more accessible.

- **No complex electronics** (e.g., no ECU mapping issues, no high-pressure fuel systems) reduce troubleshooting complexity.

---

### **Cons of Buying a Used/Aftermarket 4.5L M117 Crankshaft**

1. **Age-Related Wear and Potential Issues**

- **Rod bearing wear** (common in high-mileage examples)

- **Main bearing failure** (can cause catastrophic engine damage)

- **Crankshaft deflection** (if the engine was never properly rebuilt)

- **Aftermarket crankshafts** may not always match the **original fit and finish**, potentially leading to **vibration or imbalance issues**.

2. **Maintenance Requirements**

- **Regular valve adjustments** (every **10,000 15,000 miles**)

- **Timing chain and tensioner replacement** (typically **every 60,000 100,000 miles**)

- **Rod bearing and main bearing replacement** (every **100,000 150,000 miles**)

- **Hydraulic lifter replacement** (if they become noisy)

- **Neglect in these areas** can lead to **expensive repairs** (e.g., **rod knock, timing chain failure**).

3. **Fuel and Emissions Challenges**

- **Modern fuel standards** (higher octane, ethanol blends) can **reduce performance** in older engines unless modified.

- **Emissions compliance** may require **aftermarket solutions** (e.g., **catalytic converter bypasses, EGR deletions**) if driving in areas with strict regulations.

- **Lead-free fuel** (standard since the 1980s) can **wear valve seats faster** in high-mileage engines.

4. **Limited Modern Support**

- While **parts are available**, **diagnostic tools and labor** for classic Mercedes are **less common** than for newer models.

- **Dealership service** may be **expensive or difficult** to find for non-turbo models.

- **Insurance and roadside assistance** for classic cars can be **costly or nonexistent** compared to modern vehicles.

5. **Potential for Hidden Problems**

- **Water pump failure** (common in older Mercedes) can lead to **engine overheating and damage**.

- **Timing belt/chain issues** (if applicable) can cause **valve damage** if the engine is run with a broken belt.

- **Leaking oil pans, gaskets, and seals** are frequent issues that require **regular attention**.

- **Electrical gremlins** (e.g., **faulty ignition switches, alternators, or distributors**) can be **annoying and costly to fix**.

6. **Resale Value Depends on Condition**

- While **well-maintained M117 engines** hold value, **neglected examples** can become **money pits**.

- **Restoration projects** require **significant time and money** not all owners are willing to commit to this level of effort.

- **Market demand fluctuates**; some years (e.g., **1973 1975**) are more desirable than others.

7. **Driving Experience Limitations**

- **No modern comforts** (e.g., **no cruise control, limited power steering options, manual transmissions only in some models**).

- **Rust and corrosion** (common in **W108/W109** due to early body designs) can be **expensive to repair**.

- **Modern safety features** (e.g., **airbags, ABS, traction control**) are **absent**, making them **less practical for daily use** in some regions.

---

### **Conclusion**

- **Value classic Mercedes engineering** and are willing to **maintain the engine properly**.

- **Seek a balance between performance, reliability, and cost** compared to modern engines.

- **Plan to restore or modify** the vehicle rather than use it as a daily driver.

- **Have access to mechanical skills or a trusted mechanic** for repairs.

- **Casual buyers** who want a **low-maintenance, modern vehicle**.

- **Those unwilling to invest time in upkeep** (e.g., **valve adjustments, timing chain service**).

- **People in regions with strict emissions laws** who cannot modify the vehicle.

- **Budget-conscious buyers** who cannot afford **unexpected repairs** (e.g., **

Details:

Timing sprocket included. Main and rod journals clean smooth. Removed from 1974 Mercedes-Benz 450SL R107, M117.985 engine. Condition Disclosed: Rear flex plate flange shows surface rust from storage does not affect function.

Rod bearing journals good usable condition. Crankshaft is straight no visible bending or twisting. Timing sprocket teeth fully intact. Straight shaft, no cracks visible.

No visible cracks on throws, journals or counterweights. Overall excellent condition for age and mileage. Rear flex plate mounting flange. Compatibility: Mercedes M117 4.5L V8 engine.

Front timing chain sprocket intact, all teeth present. Mercedes-Benz casting marks clearly visible on counterweights. Mercedes-Benz OEM Crankshaft M117 4.5L V8. Original crankshaft bolt/snout hardware.

Whats Included: Complete OEM crankshaft assembly. Surface rust on rear flange cosmetic only. Condition Positive: Main bearing journals clean, smooth surface, no deep scoring. Minor cosmetic marks on one counterweight face structural integrity unaffected.

OEM M117 crankshaft from 1974 450SL.

part #: 1170310701 prices

• $119.96-$425.00

specifications cranshafengin:

• for models: W108, W109, W116, R107, M117
• for makes: Mercedes
• for years: 1971-1975
• mpn: 1170310701
• part type: Engine Crankshaft
• country of origin: Germany
• oe/oem part number: 71 72 1972 73 1973 74 1974 75, 280se 280sel 300sel 450sl 450slc 450se 450sel, C107 Coupe Convertible Sedan, 4.5 117 1170100006
• vintage part: No

shipping cranshafengin:

• cost: $34.86
• transit: 5-11 Days
• carrier: FedEx
• class: Economy
• type: Calculated
• service: FedEx Ground Economy

general cranshafengin:

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

payments cranshafengin:

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

returns cranshafengin:

• policy: No Returns

seller cranshafengin:

• rating: 100.0%
• city: Santa Ana, California
• # reviews: 38

offer cranshafengin:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• best offers: True
• quantity: 1
• started: May 17, 2026

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