MERCEDES R127031000 Crankshaft 180-030-27-01 Benz R127/180

( Manufacturer Part Number: R127031000 ), ( Part Type: Crankshaft ), ( Ipn: 180 030 27 01 ), ( Country Of Origin: Germany )

Review MERCEDES benz R127/180 Crankshaft

The **Mercedes-Benz R127/180 Crankshaft (Part Number: R127031000)** is a precision-engineered component designed exclusively for the iconic **W126 and W127 series** of Mercedes-Benz luxury sedans, including models such as the **280 CE, 300 CE, 300 SE, and 300 SED**, which were produced between the late 1970s and early 1990s. Crafted from high-grade **forged steel**, this crankshaft is a critical element of the **M116 3.0-liter inline-six engine**, renowned for its reliability, smooth operation, and robust performance. The crankshaft features a **seven-main-bearing design**, ensuring optimal load distribution and minimizing vibration across the engine s powerband, from low-end torque to high-revving efficiency. Each journal and main bearing surface is meticulously **ground and polished** to exacting tolerances, guaranteeing smooth crankshaft rotation and prolonged engine life, even under demanding conditions. The **counterweights** are dynamically balanced to prevent excessive harmonic distortion, contributing to the engine s signature **silky-smooth power delivery** a hallmark of Mercedes-Benz engineering. Whether restoring a classic W126 sedan to its former glory or upgrading a high-performance project, this crankshaft serves as a **direct-fit replacement** for failed or worn original components, ensuring compatibility with the engine s internal geometry, including the connecting rods, bearings, and timing system. Built to withstand the stresses of modern fuel and high-performance modifications, the R127031000 crankshaft is an essential part for enthusiasts seeking to preserve or enhance the legendary driving dynamics of these legendary Mercedes-Benz models.

### Pros and Cons of Buying a Mercedes-Benz R127 180 Crankshaft (R127031000)

The **Mercedes-Benz R127 180 crankshaft (part number R127031000)** is a critical component for the **M117 engine**, which powers several models from the **W123 (1975 1985) generation**, including the **230, 250, 280, and 300 series**. Here are the key advantages of purchasing this part:

1. **Reliability and Durability**

- The **M117 engine** is one of Mercedes-Benz s most robust inline-six designs, known for its smooth operation and longevity when properly maintained.

- A **new or high-quality used crankshaft** ensures structural integrity, reducing the risk of catastrophic engine failure (e.g., rod bearing failure or main bearing seizure).

- Many R123 owners report that **replacing a worn crankshaft** significantly extends engine life, especially if the original was damaged by excessive wear or improper maintenance.

2. **Performance and Drivability Improvements**

- A **fresh crankshaft** eliminates internal engine noise (e.g., tapping or knocking) caused by worn main bearings, improving overall smoothness.

- If the engine was running with **low oil pressure or excessive play**, a new crankshaft restores proper balance, reducing vibrations and enhancing drivability.

- Some aftermarket crankshafts (e.g., **Hennig, KSK, or forged options**) offer **higher strength** than the stock part, which can improve performance in high-RPM applications (though stock crankshafts are already robust).

3. **Preventative Maintenance and Long-Term Cost Savings**

- Replacing a **worn crankshaft before it fails** is far cheaper than **rebuilding or replacing an entire engine** due to a seized main bearing.

- Many R123 engines with **high mileage (200,000 miles)** benefit from a **crankshaft replacement** as part of a **major overhaul**, preventing unexpected breakdowns.

- If the engine was **modified (e.g., forced induction, high compression)**, a **new crankshaft** ensures it can handle increased stress without failure.

4. **Availability and Compatibility**

- The **R127031000 crankshaft** is a **standard OEM part**, meaning it fits directly into the **M117 engine block** without modification.

- It is widely available from **Mercedes-Benz dealerships, specialty engine rebuilders, and online marketplaces** (e.g., eBay, RockAuto, or European parts suppliers).

- **Used crankshafts** (from rebuilt engines) can be a cost-effective alternative to new ones, though inspection for cracks or wear is essential.

5. **Compatibility with Engine Upgrades**

- If you plan to **rebuild the M117 engine**, a **new crankshaft** is often recommended alongside **new bearings, rods, and pistons** for maximum reliability.

- Some enthusiasts **balance the crankshaft** or use **aftermarket forged cranks** for improved strength, though this is more common in performance builds.

---

1. **High Replacement Cost**

- A **new OEM crankshaft** can cost **$500 $1,200 **, depending on the supplier and whether it includes **bearings, seals, or machining**.

- **Used crankshafts** (from rebuilt engines) are cheaper (**$200 $600**) but require **inspection for cracks, wear, or damage**.

- **Labor costs** for installation (if not doing it yourself) can add **$500 $1,500 **, depending on the mechanic s rates.

2. **Complex Installation Requires Expertise**

- Replacing a crankshaft involves **disassembling the entire engine**, which is a **multi-day job** for most mechanics.

- **Precision machining** (if needed) adds complexity some shops require **new bearings, rods, and possibly a new block** if the engine was severely worn.

- **Mistakes in installation** (e.g., improper bearing fit, misalignment) can lead to **premature failure**, so only **trusted mechanics** should handle this work.

3. **Potential for Counterfeit or Low-Quality Parts**

- Some **aftermarket or "used" crankshafts** may be **mismarked, cracked, or improperly heat-treated**, leading to **premature failure**.

- **Chinese or no-name brands** (common in online marketplaces) may not meet **OEM specifications**, risking **engine damage**.

- Always **verify the part number (R127031000)** and **source from reputable suppliers** (e.g., **Mercedes-Benz dealerships, KSK, or Hennig**).

4. **Engine Condition Must Be Addressed Simultaneously**

- Simply replacing the crankshaft **without addressing other worn components** (e.g., **rods, pistons, camshaft, or timing components**) will **not fully restore engine health**.

- If the **block is warped, the rods are bent, or the bearings are seized**, these issues must be fixed **alongside the crankshaft** to prevent future problems.

- Some owners **underestimate the scope of work**, leading to **unexpected additional costs** (e.g., **$2,000 $5,000 for a full rebuild**).

5. **Time and Downtime Required**

- A **full engine rebuild with crankshaft replacement** can take **1 3 weeks**, depending on the mechanic s workload.

- The vehicle will be **non-drivable** during this period, which can be inconvenient for daily use.

- If the engine was **already failing**, this downtime may be **necessary to avoid a complete breakdown**.

6. **Potential for Overkill on Some Engines**

- If the engine was **only experiencing minor issues** (e.g., **slight oil consumption, minor knocking**), a **crankshaft replacement may be excessive**.

- In such cases, **minor repairs (e.g., new rings, valves, or a timing belt)** might suffice, making a **full crankshaft swap unnecessary**.

- Always **diagnose the root cause** before committing to a major overhaul.

---

The **Mercedes-Benz R127031000 crankshaft** is a **critical and reliable component** for the **M117 engine**, offering **long-term durability, improved performance, and peace of mind** when replacing a worn or damaged part. However, it is **not a simple or cheap fix** it requires **significant labor, precision, and often additional engine work** to be truly effective.

**The engine is showing signs of severe internal wear** (e.g., **high oil consumption, low compression, excessive noise, or oil leaks from the crankshaft seals**).

**The engine has high mileage (150,000 miles) and needs a major overhaul** replacing the crankshaft extends its life significantly.

**You plan to rebuild the engine anyway** a new crankshaft is a **wise investment** alongside new bearings, rods, and pistons.

**The engine was modified (e.g., forced induction, high compression)** a **new crankshaft ensures it can handle increased stress**.

**You have a trusted mechanic** who can perform the work **correctly and efficiently**.

**The engine has minor issues** (e.g., **slight knocking, minor oil leaks**) that could be fixed with **less invasive repairs**.

**The engine block is warped or the rods are bent** these issues must be addressed **before** replacing the crankshaft.

**You re on a tight budget** if the engine is **already beyond repair**, a **crankshaft replacement alone won t save it**.

**You lack access to a skilled mechanic** poor installation can **worsen the problem** or cause **new issues**.

---

**If your R123 s M117 engine is showing signs of crankshaft wear (e.g., tapping noises, low oil pressure, or oil leaks), replacing it with a **new or high-quality used R127031000 crankshaft is a smart long-term investment.** However, **do not treat it as a standalone fix** a **full engine rebuild** (including bearings, rods, pistons, and seals) is ideal for maximum reliability.

1. **Diagnose the Engine Properly**

- Check for **oil leaks, compression, and bearing condition** before committing to a crankshaft replacement.

- If the **block is damaged or the rods are bent**, these must be fixed **first**.

2. **Choose the Right Crankshaft**

- **OEM (Mercedes-Benz dealership)** Most reliable, but expensive.

- **Reputable after

Details:

Rods 0.50 Mains Reground crankshaft.

part #: r127031000 prices

• $500.00-$685.00

specifications cranshafengin:

• for makes: Mercedes
• mpn: R127031000
• part type: Crankshaft
• ipn: 180 030 27 01
• country of origin: Germany

seller cranshafengin:

• # reviews: 290
• rating: 100.0%
• city: Stone Park, Illinois

shipping cranshafengin:

• transit: 2-6 Days
• service: UPS Ground
• type: Calculated
• carrier: UPS
• class: Standard
• cost: $205.69

general cranshafengin:

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

payments cranshafengin:

• wallet: Apple-pay
• credit card: Diners-club
• other

returns cranshafengin:

• policy: No Returns

offer cranshafengin:

• availability: In Stock
• sold: 0
• quantity: 1
• started: March 10, 2026
• best offers: True
• options: Ship-to-home

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