MERCEDES 6420100921 Left Cylinder Head Diesel Benz 3.0

( Manufacturer Part Number: 6420100921 ), ( Fitment Type: Direct Replacement ), ( Mounting Hardware Included: No ), ( Manufacturer Warranty: 30 Days ), ( Type: Left Cylinder Head ), ( Year: 2019 ), ( Make: Mercedes-benz ), ( Engine Size: 3.0 ), ( Valvetrain Iteration: Dohc ), ( Transmission Type: Automatic ), ( Location Id: 4n02 ), ( Vehicle Id: 16784 )

Review MERCEDES benz 64 0921 Left Cylinder Head 3.0 Diesel fits SPRINTER 3500 2010–2022

The **Mercedes-Benz 6420100921 Left Cylinder Head** is a precision-engineered component designed exclusively for the **2010 2022 Mercedes-Benz Sprinter 3500 3.0L OM642 diesel engine**, ensuring optimal performance, reliability, and longevity for this robust commercial vehicle. Crafted from high-grade cast iron, this cylinder head is meticulously machined to exacting specifications, featuring a **four-valve per cylinder design** with integrated **intake and exhaust ports** that promote efficient airflow and combustion. The head incorporates **hydraulic valve lifters**, eliminating the need for manual adjustment and reducing maintenance requirements while maintaining consistent valve clearance. A **high-pressure fuel injection system** is accommodated through strategically placed **fuel injector bores**, ensuring precise fuel delivery for optimal power output and reduced emissions. The **left cylinder head** is equipped with a **coolant passage system** that regulates engine temperature, preventing overheating and extending the lifespan of critical components. Additionally, it includes **spark plug bores** (for ignition systems) and **camshaft lobes** that drive the valve train, delivering smooth operation and minimizing wear. This part is fully compatible with the **OM642 engine**, which powers the Sprinter s diesel performance, offering **300 333 horsepower** and **630 700 lb-ft of torque**, making it ideal for heavy-duty applications such as cargo transport, service vehicles, and commercial fleets. Whether replacing a worn or damaged head or upgrading for enhanced durability, this **OEM-quality cylinder head** ensures seamless integration with the engine s internal components, including the **piston assembly, crankshaft, and timing system**. Built to Mercedes-Benz s rigorous standards, it delivers the same level of precision and reliability as the original equipment, guaranteeing peak efficiency and dependability for years of demanding use.

### Pros and Cons of Buying a Mercedes-Benz 6420100921 Left Cylinder Head for a 2010-2022 Sprinter 3500 3.0 Diesel

1. **Compatibility and Fitment** The part number **6420100921** is a direct replacement for the left cylinder head in the **OM642 engine**, which powers the 2010-2022 Sprinter 3500 3.0 diesel. This ensures a proper fit without modifications, reducing installation risks.

2. **OEM Quality** As a genuine Mercedes-Benz part, it is manufactured to the same high standards as the original equipment, ensuring durability, performance, and reliability. This minimizes the risk of premature failure compared to aftermarket knockoffs.

3. **Warranty Coverage** Purchasing from an authorized dealer or Mercedes-Benz approved supplier may include a warranty, providing peace of mind against defects in materials or workmanship.

4. **Performance and Efficiency** A properly functioning cylinder head ensures optimal combustion, fuel efficiency, and power output. Replacing a faulty head can restore engine performance to factory specifications.

5. **Prevents Further Damage** A failing cylinder head can lead to catastrophic engine damage (e.g., blown head gaskets, warped surfaces, or coolant/fuel leaks). Replacing it early prevents costly repairs down the line.

6. **Resale Value** Keeping the engine in good condition with OEM parts helps maintain the Sprinter s resale value, especially for commercial or fleet applications where reliability is critical.

7. **Access to Support** Mercedes-Benz dealerships and authorized service centers have technicians familiar with the engine, making installation and diagnostics easier.

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1. **High Cost** OEM cylinder heads are expensive, often costing **$1,500 $3,000 ** depending on the source, labor, and additional required parts (e.g., gaskets, bolts, seals). This can be a significant upfront investment.

2. **Long Lead Times** Genuine parts may not be immediately available, requiring ordering from a distributor, which can delay repairs. Aftermarket alternatives might be faster but less reliable.

3. **Labor-Intensive Installation** Replacing a cylinder head requires disassembling the engine, removing the head, machining the mating surface (if warped), and reassembling with precision. This is a complex job best left to experienced mechanics, adding to labor costs.

- **Head gaskets** (e.g., Fel-Pro or OEM)

- **New bolts** (torque-to-yield bolts must be replaced per Mercedes specs)

- **Seals, O-rings, and gaskets** (valve cover, oil pan, etc.)

- **Coolant flush** (if the cooling system was compromised)

- **Fuel system cleaning** (if carbon buildup is present)

These extras can add **$500 $1,500 ** to the total cost.

5. **Potential for Hidden Issues** If the engine has been previously damaged (e.g., from overheating, incorrect torque, or poor maintenance), the cylinder head may not be the only problem. A full engine inspection is recommended to avoid recurring issues.

6. **Aftermarket Alternatives May Be Cheaper** While not OEM, reputable aftermarket brands (e.g., **Mahle, Fel-Pro, or Eurospec**) offer cylinder heads at a fraction of the cost. However, quality varies, and some may lack long-term durability.

7. **Machining Requirements** If the existing head is warped or damaged, it may need **surface machining** (typically **0.030 0.060 inches**) to ensure a proper seal. This adds to labor costs and may void warranties if not done correctly.

8. **Risk of Overpaying** Buying from unscrupulous sellers (e.g., eBay, Craigslist, or uncertified online marketplaces) can lead to counterfeit or used parts. Always verify authenticity and source.

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Buying a **Mercedes-Benz 6420100921 OEM cylinder head** for your 2010-2022 Sprinter 3500 3.0 diesel is the **most reliable and long-term solution** if budget and time are not constraints. It ensures proper fitment, performance, and warranty coverage, but at a premium cost. However, if the engine has been neglected or the head is severely damaged, additional repairs (e.g., machining, gasket replacement) may be necessary, further increasing expenses.

For those seeking a **cost-effective alternative**, high-quality aftermarket cylinder heads (from trusted brands) can be a viable option, though they require careful research to avoid poor-quality parts. The decision ultimately depends on your **budget, urgency, and long-term reliability needs**.

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1. **Verify the Problem First** Before purchasing, confirm that the cylinder head is indeed the issue (not a head gasket, oil leaks, or other components). A **pressure test, leak-down test, or compression test** can help diagnose the exact problem.

2. **Choose Your Source Wisely**

- **For OEM Quality:** Buy directly from **Mercedes-Benz dealerships, authorized distributors (e.g., MB Parts, Euro Car Parts), or reputable online suppliers (e.g., RockAuto, PartsGeek)**. Avoid gray-market sellers.

- **For Budget Alternatives:** Consider **Mahle, Fel-Pro, or Eurospec** cylinder heads, but ensure they are **new, not refurbished**, and come with a warranty.

- **Cylinder head** ($1,500 $3,000 for OEM)

- **Head gaskets, bolts, and seals** ($300 $800)

- **Labor** ($800 $1,500 depending on shop rates)

- **Additional diagnostics** (if needed)

4. **Get Multiple Quotes** Compare prices from **dealerships, independent mechanics, and online suppliers** to ensure you re getting a fair deal.

5. **Consider Professional Installation** Unless you have **experience with engine disassembly**, have a **Mercedes-Benz specialist or high-quality mechanic** perform the work to avoid mistakes.

6. **Maintain the Engine Post-Repair** After replacement, follow **Mercedes service intervals**, use **high-quality oil and filters**, and monitor for **coolant leaks, oil consumption, or performance issues** to extend the life of the repaired engine.

If **reliability and longevity** are priorities, the **OEM cylinder head is the best choice**, despite the higher cost. If **cost is a major concern**, a **high-quality aftermarket part** from a trusted brand can be a reasonable compromise **but only if sourced carefully**. Always prioritize **proper installation and post-repair maintenance** to ensure the repair holds.

Details:

Mercedes-Benz Sprinter 3500 2010 2022 3.0L. Mercedes-Benz Sprinter 2500 2010 2022 3.0L. Mercedes-Benz Sprinter 3500XD 2019 2022 3.0L. Please replace such items as required for proper installation.

part #: 6420100921 prices

• $260.70-$599.95

specifications cylinderheapar:

• for models: 3500, Sprinter
• for makes: Mercedes
• for years: 2010-2022
• mpn: 6420100921
• fitment type: Direct Replacement
• mounting hardware included: No
• manufacturer warranty: 30 Days
• type: Left Cylinder Head
• year: 2019
• make: Mercedes-benz
• engine size: 3.0
• valvetrain iteration: Dohc
• transmission type: Automatic
• location id: 4n02
• vehicle id: 16784

payments cylinderheapar:

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

returns cylinderheapar:

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

general cylinderheapar:

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

offer cylinderheapar:

• quantity: 1
• started: March 9, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock

seller cylinderheapar:

• # reviews: 69793
• rating: 99.8%
• city: Denver, Colorado

shipping cylinderheapar:

• service: Standard
• transit: 3-7 Days
• class: Standard
• cost: $0.00
• type: Fixed

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