MERCEDES 6170310401 Nos Crankshaft Bearings Kit Benz OM617 W460

( Manufacturer Part Number: 6170310401 ), ( Part Type: Bearing Crankshaft ), ( Vintage Part: Yes ), ( Country Of Origin: Germany )

Review MERCEDES benz Nos Reman Crankshaft And Bearings Kit Gd fits 300D W123

The **Mercedes-Benz 6170310401 NOS OM617 Crankshaft Bearings Kit** is a meticulously engineered aftermarket component designed exclusively for the iconic **OM617 diesel engine**, found in legendary Mercedes-Benz models such as the **W460 (SLK R170) and W123 (200D, 240D, 300D, and 300D Turbo)** from the late 1980s and early 1990s. This **New Old Stock (NOS) bearings kit** represents a high-quality, direct replacement for the original factory bearings, ensuring optimal performance, durability, and reliability for engines that have either worn out their stock components or require a proactive upgrade to prevent premature failure. Crafted from premium **bearing steel alloys**, these bearings are precision-machined to Mercedes-Benz specifications, guaranteeing a perfect fit within the crankshaft journals of the OM617 s cast-iron block. The kit includes a complete set of **main and connecting rod bearings**, including the necessary **bearing shells, shims, and oil grooves**, all designed to minimize friction, reduce wear, and enhance engine longevity. Whether installed in a restored classic, a high-mileage daily driver, or a performance-oriented project, this bearings kit is a critical component for maintaining the OM617 s legendary reliability, which has earned it a reputation as one of the most robust and enduring diesel engines in automotive history. The **W460 SLK R170** and **W123 300D** models, in particular, benefit significantly from this upgrade, as their high-revving, torque-rich engines demand bearings that can withstand the stresses of aggressive driving, extended use, or even minor modifications. By choosing this NOS kit, enthusiasts and mechanics ensure they are using parts that meet or exceed OEM standards, avoiding the compromises often found in lower-quality aftermarket alternatives. Proper installation, along with the use of high-quality engine oil and regular maintenance, will further extend the life of these bearings, allowing the OM617 to continue delivering its signature blend of power, efficiency, and dependability for countless miles ahead.

### **Analysis of buying a Mercedes-Benz 6170310401 OM617 Crankshaft Bearings Kit (300D GD, W460/W123)**

#### **Pros**

1. **OEM Quality** This is a genuine Mercedes-Benz part, ensuring compatibility and reliability. OEM components are designed to meet the manufacturer s exact specifications, reducing the risk of premature failure or poor performance.

2. **Long-Term Durability** The OM617 engine is a robust diesel unit, and high-quality crankshaft bearings are critical for its longevity. Replacing them with OEM parts helps maintain the engine s structural integrity and prevents catastrophic failure.

3. **Prevents Engine Damage** Worn or failing crankshaft bearings can lead to catastrophic engine damage, including rod knock, bearing seizure, or even a blown engine. Replacing them proactively avoids costly repairs.

4. **Maintains Resale Value** Keeping the engine in top condition with genuine parts helps preserve the vehicle s value, especially for classic or high-mileage models like the W123 or W460.

5. **Warranty Coverage** If the vehicle still has an active warranty (or if you purchase an extended warranty), using OEM parts ensures coverage remains valid.

6. **Better Performance** OEM bearings provide smoother operation compared to aftermarket alternatives, reducing vibration and noise in the long run.

7. **Easier Installation** Since it s an original part, it fits perfectly without modifications, making the replacement process straightforward for a skilled mechanic.

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#### **Cons**

1. **High Cost** OEM parts are significantly more expensive than aftermarket alternatives. The crankshaft bearings kit alone can cost several hundred dollars, and labor for replacement (if not DIY) will add to the expense.

2. **Limited Availability** Older models like the W123 (1975 1985) and W460 (1985 1991) may have reduced availability of OEM parts, though this kit appears to be widely stocked.

3. **DIY Difficulty** Replacing crankshaft bearings requires advanced mechanical skills, specialized tools (like a bearing press and torque wrench), and disassembly of the engine. Mistakes can lead to further damage.

4. **Potential Overkill for Low-Mileage Engines** If the engine has very low mileage (e.g., under 100,000 km) and has never had bearing issues, replacing them purely as a precaution may not be necessary. Bearings typically last the engine s lifespan if maintained properly.

5. **Alternative Options Exist** High-quality aftermarket brands (e.g., Fel-Pro, Mahle, or Koyo) offer comparable or even superior bearings at a fraction of the cost. Some aftermarket kits include additional benefits like improved oil flow or noise reduction.

6. **Labor Intensity** The job involves removing the engine from the vehicle, stripping it down to the crankshaft, and carefully installing new bearings. This is a multi-day project for most enthusiasts.

7. **Risk of Counterfeit Parts** If purchasing from a non-authorized seller, there s a chance of receiving fake OEM parts. Always buy from reputable dealers or directly from Mercedes-Benz or its approved distributors.

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### **Key Considerations Before Purchase**

- **Engine Condition** Check for signs of bearing wear (knocking noises, oil consumption, or blue smoke) before deciding. If the engine is running smoothly, the bearings may still have life left.

- **Maintenance History** If the engine has been well-maintained (regular oil changes, proper cooling, etc.), the bearings may not need replacement yet.

- **Budget vs. Necessity** If the engine is showing symptoms of bearing failure, the cost is justified. If it s purely preventive, weigh the expense against the engine s remaining lifespan.

- **DIY vs. Professional Installation** If you lack experience, factor in labor costs. A professional mechanic may charge $500 $1,500 for the job, depending on location and complexity.

- **Aftermarket Alternatives** Brands like **Fel-Pro, Mahle, or Koyo** offer kits that are often just as good or better than OEM, with warranties and sometimes additional benefits (e.g., improved oil flow grooves).

---

### **Conclusion and Recommendation**

- The engine is showing clear signs of bearing wear (e.g., rod knock, excessive oil consumption, or visible damage).

- You have a verified need for replacement and can afford the higher cost.

- You prioritize absolute reliability and warranty coverage.

- You re comfortable with the labor-intensive installation process or have access to a skilled mechanic.

- The engine is running fine with no symptoms of bearing failure.

- You re on a tighter budget and can find a reputable aftermarket kit (e.g., Fel-Pro or Mahle) with a warranty.

- You re unsure whether the bearings are truly worn and want to verify with an engine inspection first.

For a **W123 or W460 300D OM617 engine with no obvious bearing issues**, **do not replace the crankshaft bearings purely as a precautionary measure**. Instead:

1. **Inspect the engine** for signs of wear (listen for knocking, check oil condition, and look for blue smoke).

2. **If symptoms exist**, proceed with the OEM kit or a high-quality aftermarket alternative (e.g., Fel-Pro 52000 or Mahle C20N).

3. **If the engine is healthy**, focus on maintaining it properly (regular oil changes, cooling system checks) and consider other high-mileage upgrades (e.g., fuel system cleaning, timing belt replacement if due).

If you decide to replace them, **prioritize quality over cost** whether OEM or aftermarket and ensure proper installation to avoid future issues. For most enthusiasts, this is a **high-effort, high-cost project** that should only be undertaken when necessary.

Details:

This is for Naturally Aspirated. Photos of rod/main shaft measurements. Box marked Rod bear size STD and Main bearing 020. Clean ready to install.

With bearing kits shown.

part #: 6170310401 prices

• $98.00-$445.00

specifications cranshafengin:

• for models: 300d, W123
• for makes: Mercedes
• mpn: 6170310401
• part type: Bearing Crankshaft
• vintage part: Yes
• country of origin: Germany

offer cranshafengin:

• availability: In Stock
• quantity: 1
• options: Ship-to-home
• sold: 0
• started: January 31, 2026

general cranshafengin:

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

shipping cranshafengin:

• carrier: USPS
• type: Calculated
• transit: 4-9 Days
• service: USPS Ground Advantage
• cost: $134.05
• class: Standard

payments cranshafengin:

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

returns cranshafengin:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

seller cranshafengin:

• # reviews: 2288
• rating: 99.4%
• city: Portland, Oregon

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