MERCEDES 31720 Left Engine Cylinder Head Typ Benz 166

( Manufacturer Part Number: 31720 ), ( Seller Notes: Sl550, 4.6 Lh W/ Cover ), ( Color: Palladium Silver ), ( Genuine Oem: No ), ( Make: Mercedes-benz ), ( Type: Engine Cylinder Head ), ( Manufacturer Warranty: 90 Day ), ( Interchange Item Code: 306 ), ( Partout Id: A-131174560 )

Review MERCEDES benz Used Left Engine Cylinder Head S class 166 Typ fits 2013

The **Mercedes-Benz 31720 Left Engine Cylinder Head (2013 S-Class, W222, Type 166)** is a precision-engineered component integral to the performance, reliability, and longevity of the iconic M276 inline-six engine found in the luxury W222 S-Class. This left-hand cylinder head, manufactured to Mercedes-Benz s exacting standards, is designed to accommodate the engine s advanced direct-injection system, variable valve timing (VANOS), and high-performance turbocharging setup, ensuring optimal combustion efficiency and power delivery. Crafted from high-grade aluminum alloy, the head is engineered for superior heat dissipation while maintaining structural integrity under the extreme thermal and mechanical stresses of high-performance driving. The casting features meticulously machined combustion chambers, intake and exhaust ports, and precise valve seat inserts, all of which contribute to the engine s smooth operation and reduced emissions. This cylinder head is equipped with integrated spark plug bosses, valve springs, and hydraulic lash adjusters, all of which work in harmony to deliver precise valve timing and minimize wear over the engine s lifespan. Additionally, the head incorporates advanced cooling passages and oil galleries to prevent overheating and ensure consistent lubrication of critical components. Whether sourced for a restoration project, a performance upgrade, or a replacement due to wear, this cylinder head exemplifies Mercedes-Benz s commitment to engineering excellence, blending cutting-edge technology with timeless craftsmanship. Its compatibility with the 2013 S-Class s M276 engine underscores its role as a vital part of the vehicle s sophisticated powertrain, capable of sustaining the demands of both daily driving and spirited performance.

### **Pros and Cons of Buying a Mercedes-Benz 317 2.0L Left Engine Cylinder Head (2013 S-Class, W222, 166 HP) for Replacement**

1. **Reliability of Mercedes-Benz Engines** The M276 3.0L V6 engine (left-hand cylinder head variant) is a well-engineered powerplant known for durability when properly maintained. Many owners report long-term reliability if service intervals are followed.

2. **Aftermarket Support** The 3.0L V6 is a popular engine in the luxury market, meaning parts (especially cylinder heads) are widely available. There is a strong aftermarket presence for gaskets, seals, and rebuild kits.

3. **Performance Potential** With a stock displacement of 2,997cc and a compression ratio of 10.5:1, this engine can be tuned for improved power (up to 250 HP with minor modifications). Forcing induction (turbo or supercharger) is also feasible, though requires careful attention to head and valve train strength.

4. **Compatibility with Other Models** The left-hand cylinder head is used in multiple Mercedes-Benz models (e.g., S-Class, E-Class, GL-Class), increasing the pool of potential used parts.

5. **Potential for Long-Term Use** If the head is structurally sound (no cracks, warping, or severe wear), it can last decades with proper maintenance. Many high-mileage examples remain in service with minimal issues.

6. **Ease of Modification** The M276 is a naturally aspirated engine, making it easier to modify compared to turbocharged variants. Porting, polishing, and camshaft upgrades can enhance performance without complex turbocharging setups.

7. **Resale Value of the Engine** If the head is in good condition, it may retain value, especially if paired with a well-maintained engine block.

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- **Cylinder Head Cracks** Stress cracks (especially around the valve cover and oil passages) are a frequent failure, often requiring a full rebuild or replacement.

- **Rod Bearings & Camshaft Wear** Some engines develop rod bearing issues or camshaft wear, leading to oil consumption and knocking.

- **Oil Leaks** Valve cover gaskets, oil filter housing gaskets, and rear main seal leaks are common, requiring frequent attention.

- **Water Pump & Thermostat Failures** The cooling system is prone to leaks, which can lead to overheating if not addressed.

2. **Cost of Replacement vs. Rebuild** A new left-hand cylinder head for the M276 can cost **$1,500 $3,000 ** depending on source (OEM vs. aftermarket). A full engine rebuild (including heads, gaskets, and machining) may exceed **$5,000 $8,000**, making replacement a more cost-effective option if the head is beyond repair.

- Removing the engine from the vehicle (or performing an in-place swap, which is difficult).

- Rebuilding or replacing gaskets, seals, and bolts (Mercedes uses high-strength bolts that must be torqued precisely).

- Potential need for valve adjustment (though the M276 is hydraulic, some models require manual valve lash checks).

4. **Risk of Hidden Damage** If the head has been previously cracked or warped, it may not be salvageable. A professional inspection (including magnaflux testing for cracks) is essential before purchasing.

- **Cylinder bore size** (some aftermarket heads may not fit perfectly).

- **Oil passage routing** (left-hand vs. right-hand heads have different oil flow paths).

- **Intake manifold compatibility** (some aftermarket manifolds may not fit without modification).

6. **Potential for Further Engine Issues** If the engine has other problems (e.g., rod bearing wear, camshaft damage), replacing just the head won t fix them. A full engine inspection is recommended.

7. **Warranty & Return Risks** Used parts (even from reputable sellers) may have hidden defects. Some sellers offer limited warranties, but returns can be difficult if the part fails shortly after installation.

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### **Conclusion**

- The head is **structurally sound** (no cracks, warping, or severe wear).

- You have **access to a reliable engine rebuild shop** for installation.

- You are prepared for **potential additional engine work** (e.g., rod bearings, camshaft).

- You plan to **modify the engine** (forcing induction or high-performance tuning).

However, if the head is **cracked, warped, or from an unknown source**, it may **not be worth the risk**, especially if a **rebuild kit or new head** is more affordable.

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### **Recommendation**

- **Cracks** (use dye penetrant or magnaflux testing).

- **Warping** (check flatness of the mating surface).

- **Valve seat wear** (should be smooth, not pitted).

- **Oil passages** (ensure no blockages or leaks).

- **Bore size** (some aftermarket heads may require resizing).

- **Oil pump compatibility** (left-hand heads may require a different pump).

- **Intake manifold fitment** (some aftermarket manifolds may not align).

3. **Consider a Rebuild Kit Instead** If the head is **minorly worn**, a **rebuild kit ( $800 $1,500)** may be cheaper than a full replacement.

4. **Buy from a Trusted Source**

- **OEM Mercedes parts** (from authorized dealers or reputable online sellers like **Mercedes-Benz Parts, eBay (verified sellers), or specialty shops**).

- **Aftermarket brands** (e.g., **Felix, MBS, or Remy**) if you confirm compatibility.

- Avoid **unknown sources** unless you can inspect the part in person.

5. **Budget for Installation Costs** Replacing a cylinder head typically requires **$1,500 $3,000 in labor**, depending on whether the engine is removed or done in-place.

6. **Plan for Additional Work** If the engine has **rod bearing wear, camshaft issues, or oil leaks**, address them simultaneously to avoid future problems.

7. **Alternative: Buy a Used Engine** If the engine is **beyond repair**, purchasing a **used M276 engine ( $3,000 $6,000)** may be cheaper than rebuilding.

- **Worth it if:** The head is **in excellent condition**, you have **proper tools/labor**, and you re **prepared for potential engine work**.

- **Not worth it if:** The head has **hidden damage**, you lack **mechanical expertise**, or a **rebuild kit/new head is more affordable**.

- **Get a professional inspection** before purchasing.

- **Compare costs** (replacement head vs. rebuild kit vs. used engine).

- **Factor in labor** this is not a DIY job for most enthusiasts.

- **Consider a warranty** if buying used to mitigate risk.

If you proceed, **prioritize quality over cost** a cheap head with cracks will cost more in the long run.

Details:

This part fits vehicles made in the following years 2012, 2013 ,2014. Used Engine Cylinder Head. Every part is cleaned, tested and inspected by experts. 231 Type SL550 L.

Parts go back into cars rather than landfill. Cylinder head are guaranteed to be non-cracked, non-warped, good usable heads. Not just our Heritage, but Legacy Used Left Engine Cylinder Head fits: 2013 Mercedes-benz Mercedes s-class 166 Typ. All parts are covered by warranty.

Orders placed after 2:00 pm CST cannot be guaranteed shipping that day. Original parts mean a perfect fit. Superseded Part Numbers This item may have been superseded from a different part number this manufacturer.

part #: 31720 prices

• $48.33-$249.00

specifications cylinderheapar:

• for makes: Mercedes
• for years: 2013
• mpn: 31720
• seller notes: Sl550, 4.6 Lh W/ Cover
• color: Palladium Silver
• genuine oem: No
• make: Mercedes-benz
• type: Engine Cylinder Head
• manufacturer warranty: 90 Day
• interchange item code: 306
• partout id: A-131174560

seller cylinderheapar:

• rating: 99.5%
• # reviews: 6894
• city: Mobile, Alabama

payments cylinderheapar:

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

general cylinderheapar:

• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads

returns cylinderheapar:

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

offer cylinderheapar:

• started: June 3, 2026
• quantity: 1
• options: Ship-to-home
• availability: In Stock
• sold: 0

shipping cylinderheapar:

• class: Standard, Expedited
• service: FedEx Ground / FedEx Home Delivery, USPS Priority Mail, USPS Ground Advantage
• cost: $0.00
• type: Fixed
• transit: 3-7 Days
• carrier: FedEx, USPS

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