MERCEDES A2720300803 Crankshaft Puley Engine Benz

( Manufacturer Part Number: A2720300803 ), ( Part Type: Crankshaft Engine )

Review MERCEDES benz Class Crankshaft Puley Engine fits W212 E350 2010–2013

The **Mercedes-Benz A2720300803 Crankshaft Pulley (Engine Code W212 E350, 2010 2013)** is a precision-engineered component designed to play a critical role in the smooth and efficient operation of the iconic **M272 V6 3.5-liter engine** found in select models of the **Mercedes-Benz E-Class (W212)** during its mid-cycle refresh. This crankshaft pulley, often referred to as the harmonic balancer or vibration damper, is forged from high-grade steel and dynamically balanced to minimize engine vibrations, ensuring optimal performance, longevity, and a refined driving experience. Its robust construction incorporates a rubberized outer layer, meticulously tuned to absorb torsional oscillations generated by the engine s rotating crankshaft, thereby reducing noise, harshness, and potential wear on connected components such as the timing belt, alternator, and power steering pump. The pulley s design also includes a robust mounting flange with precision-machined bolt holes, ensuring a secure and accurate fitment to the crankshaft nose, which is critical for maintaining proper alignment and torque distribution.

This particular pulley is engineered to accommodate the **E350 model s 3.5-liter V6 engine**, which produces approximately **265 horsepower and 263 lb-ft of torque** in its standard configuration, delivering a balance of power and efficiency. Over time, however, factors such as extreme heat, mechanical stress, or exposure to harsh driving conditions can cause the rubber damping layer to crack, split, or degrade, leading to noticeable vibrations, rattling noises, or even catastrophic failure if the pulley detaches mid-operation. Replacing the crankshaft pulley with the **OEM A2720300803 part** ensures that the engine operates with the same level of precision and reliability as intended by Mercedes-Benz, restoring smooth power delivery and protecting the integrity of the drivetrain. This genuine component is manufactured to the exact specifications of the original equipment, including the correct rubber compound formulation, pulley weight, and dynamic balancing standards, making it an ideal replacement for both maintenance and restoration projects.

For mechanics and enthusiasts working on W212 E-Class vehicles from 2010 to 2013, this pulley is a straightforward yet essential upgrade, particularly during routine maintenance intervals or when addressing symptoms of a failing balancer. Its installation requires careful attention to torque specifications typically around **100 Nm (74 lb-ft)** for the crankshaft bolts to prevent overtightening or loosening, which could compromise engine alignment or lead to premature wear. While aftermarket alternatives may exist, the **A2720300803 pulley** stands out for its durability, compatibility, and adherence to Mercedes-Benz s engineering standards, ensuring that the engine continues to perform with the same level of sophistication and dependability for which the brand is renowned. Whether used in a routine service or as part of a comprehensive engine rebuild, this component is a testament to the meticulous attention to detail that defines Mercedes-Benz s legacy of automotive excellence.

### **Pros and Cons of Buying a Mercedes-Benz W212 E350 (2010 2013) with the M272 V6 Engine and Crankshaft Pulley Issue**

#### **Pros**

1. **Strong Engine Performance**

The M272 V6 (3.5L) is a robust engine, capable of producing around **265 300 hp** (depending on tuning) and **300 350 lb-ft of torque**. It is known for its smooth power delivery and durability when maintained properly. With the right modifications, it can handle spirited driving without excessive strain.

2. **Proven Reliability (When Maintained)**

The W212 platform (E350) is generally well-built, especially compared to some of its contemporaries. The M272 engine, while not as bulletproof as a diesel V6, can last **200,000 miles** if:

- Oil changes are done **every 5,000 7,500 miles** (synthetic, high-quality oil).

- Coolant is flushed and replaced **every 60,000 miles**.

- Timing belt and water pump are replaced **every 60,000 100,000 miles** (critical for preventing catastrophic failure).

- Fuel system is kept clean (regular fuel additives or fuel system cleaners).

3. **Comfortable and Refined Ride**

The W212 is known for its **luxurious interior**, quiet cabin, and smooth suspension (especially in later models with adaptive damping). The **E350** offers a balance between performance and comfort, making it suitable for daily driving.

4. **Good Resale Value (Compared to Peers)**

While not as high as newer Mercedes models, the W212 still holds value better than many German rivals (e.g., BMW E60/E61, Audi A6 C6). A well-maintained example can fetch a decent price even after 10 15 years.

5. **Aftermarket Support and Modification Potential**

- **Performance upgrades** (intake, exhaust, ECU tuning for more power).

- **Suspension upgrades** (coilovers, lower springs for better handling).

- **Aesthetic modifications** (body kits, wheels, LED lighting).

- **Reliability fixes** (crankshaft pulley reinforcement, upgraded water pump mounts).

6. **Spacious and Practical**

The W212 offers **generous rear legroom** and a **large trunk** (better than many sedans in its class). The **rear seats are more comfortable** than in some competitors, making it a good choice for families or long trips.

7. **Safety Features**

The W212 comes equipped with **standard stability control, multiple airbags, and advanced braking systems** (depending on the year). Later models (2012 2013) introduced **adaptive cruise control and lane-keeping assist**, improving safety.

8. **Classic Mercedes-Benz Driving Experience**

The **manual transmission (if available)** offers a **satisfying shift feel**, and the **automatic (7G-Tronic)** is smooth once broken in. The **steering is precise**, and the **engine noise is engaging** without being obnoxious.

---

#### **Cons**

1. **Crankshaft Pulley (Flywheel) Issue (Most Critical Flaw)**

The **M272 engine in the W212 (2010 2013) is notorious for a failing crankshaft pulley (also called the flywheel or harmonic balancer)**. Symptoms include:

- **Excessive vibration** (especially at idle or low RPM).

- **Unusual noise** (grinding, rattling, or a "clunking" sound).

- **Engine misfires or rough running** (if the pulley detaches).

- **Transmission damage** (if the pulley sheds chunks, it can damage the torque converter or transmission).

- **Check Engine Light (CEL) with P0335 (crankshaft position sensor circuit)**.

**Why is this a problem?**

- The pulley is **not a factory-replaced part** Mercedes stopped producing it, and aftermarket replacements are **expensive ($500 $1,200 installed)**.

- The issue is **common enough** that many buyers avoid these engines unless the pulley has been **previously replaced**.

- Even if the pulley is replaced, **some owners report it failing again** due to poor aftermarket quality.

- **Only buy a car where the pulley has been replaced** (ask for proof of service records).

- **Budget for a pulley replacement** if buying without one.

- **Consider a used pulley** (eBay, junkyards) and do the job yourself to save money.

2. **High Maintenance Costs**

- **Water pump failures** (often linked to the crankshaft pulley issue).

- **Timing belt and tensioner replacements** (must be done every **60,000 100,000 miles**).

- **Fuel injectors clogging** (common in older M272 engines; requires cleaning or replacement).

- **Suspension wear** (struts, bushings, and control arms degrade over time).

- **Electrical gremlins** (window regulators, sensors, infotainment glitches).

**Estimated annual maintenance cost:** **$1,000 $2,500 ** (higher than a Toyota Camry or Honda Accord).

3. **Fuel Economy is Mediocre**

The E350 gets **around 16 18 MPG city and 22 25 MPG highway** (real-world numbers may be lower). This is **worse than many Japanese sedans** in the same class, making it **less economical for daily commuting**.

4. **Common Electrical and Infotainment Issues**

- **Radio and climate control failures** (common in W212 models).

- **Power window regulators** (often fail and require expensive replacements).

- **Sensor malfunctions** (parking sensors, blind-spot monitoring).

- **Infotainment system lag** (especially in older models).

5. **Rust and Body Issues**

- The **W212 is prone to rust**, particularly in **winter regions** (salt damage to wheel wells, rocker panels, and undercarriage).

- **Paint quality varies** some models have **poor fill or chipping** due to cheap bodywork.

- **Hatchback models (W212 with optional hatch)** can develop **water leaks** over time.

6. **Transmission Problems (7G-Tronic Automatic)**

- The **7-speed automatic** is **notoriously finicky** and can develop **slipping, rough shifting, or complete failure**.

- **Fluid changes are critical** (must be done every **60,000 miles** with a **full flush**).

- **Torque converter failures** are common if maintenance is neglected.

7. **Depreciation and Reliability Concerns**

- The W212 is **not as reliable as a diesel Mercedes** (OM646/OM651 engines last much longer).

- **Long-term reliability drops significantly after 150,000 miles** unless heavily maintained.

- **Parts availability is declining** some components (e.g., original pulley, rare sensors) are **harder to find**.

8. **Driving Dynamics Limitations**

- While the E350 is **comfortable**, it is **not a handling-focused car** the suspension is **softer than a BMW or Audi** in the same segment.

- **Braking performance is adequate but not exceptional** (especially compared to modern cars).

- **No active safety features** (later models have some, but early 2010 models lack advanced systems).

---

### **Ending Conclusion**

Buying a **2010 2013 Mercedes-Benz W212 E350 with the M272 V6 engine** can be a **good or bad decision depending on your priorities, budget, and maintenance commitment**.

You **prioritize luxury, comfort, and a refined driving experience** over raw performance.

You **find a well-documented example** where the **crankshaft pulley has been replaced** (or are prepared to do it yourself).

You **plan to maintain it properly** (regular oil changes, coolant flushes, timing belt service).

You **enjoy classic Mercedes-Benz styling** and don t mind higher running costs.

You **intend to modify it** (tuning, suspension upgrades) and want a **strong base engine**.

You **cannot afford or do not want to deal with high maintenance costs**.

You **find a car without a pulley replacement

Details:

90 day part only no labor! standard warranty on all used parts.

part #: a2720300803 prices

• $70.55-$73.90

specifications cranshafengin:

• for models: W212, E350
• for makes: Mercedes
• for years: 2010-2013
• mpn: A2720300803
• part type: Crankshaft Engine

seller cranshafengin:

• # reviews: 94
• city: Rock Hill, South Carolina
• rating: 100.0%

offer cranshafengin:

• quantity: 1
• availability: In Stock
• best offers: True
• started: May 29, 2026
• options: Ship-to-home
• sold: 0

returns cranshafengin:

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

payments cranshafengin:

• credit card: Diners-club
• wallet: Paypal
• other

general cranshafengin:

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

shipping cranshafengin:

• carrier: USPS
• cost: $5.00
• type: Fixed
• class: Standard
• service: USPS Ground Advantage
• transit: 5-11 Days

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