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  3. VOLKSWAGEN 3L103373E

VOLKSWAGEN 3L103373E Engine Cylinder Head Vw Tdi Alh 1.9

fits make: Volkswagen.

3l103373e Volkswagen Engine Cylinder Head Assembly Fits For Vw 1.9 Tdi Alh

( Manufacturer Part Number: 3L103373E ), ( Part Type: Engine Cylinder Head ), ( Material: Aluminum ), ( Country Of Origin: Germany )

Review VOLKSWAGEN Engine Cylinder Head Assembly Vw 1.9 Tdi Alh

The **Volkswagen 3L103373E engine cylinder head** is a precision-engineered component designed specifically for the **1.9L TDI ALH (AWV) diesel engine**, a robust and fuel-efficient powerplant found in select Volkswagen, Audi, and koda models from the late 1990s through the early 2000s. Crafted from high-grade cast iron, this cylinder head is built to withstand the demanding pressures and temperatures generated by the engine s **common-rail direct-injection diesel system**, ensuring optimal combustion efficiency and longevity. The head features **four intake and four exhaust valves per cylinder**, arranged in a symmetrical layout to promote balanced airflow and reduce turbulence, which enhances both performance and fuel economy. Each valve is meticulously guided by **tappets and pushrods**, driving a **single overhead camshaft (SOHC)** that synchronizes valve operation via a **timing chain** a design choice that balances simplicity with reliability. The **intake ports** are contoured to maximize airflow into the combustion chamber, while the **exhaust ports** are optimized for efficient scavenging, reducing backpressure and improving exhaust gas flow. The head also incorporates **individual fuel injectors** per cylinder, delivering precise fuel delivery directly into the combustion chamber for optimal combustion and reduced emissions. To ensure durability, the **valve seats** are precision-machined and hardened, while the **spark plug bosses** (where applicable) are reinforced to accommodate the engine s high compression ratios. This cylinder head is a critical component in maintaining the **1.9 TDI ALH s** reputation for **torque, fuel efficiency, and reliability**, making it an essential replacement part for engines experiencing issues such as **leaking head gaskets, warped surfaces, or worn valve train components**. Whether restoring an older vehicle or performing a routine maintenance upgrade, this **OEM-quality cylinder head** ensures a seamless fit and performance identical to the original, helping to preserve the engine s integrity and efficiency for years to come.

### **Pros and Cons of Buying a Volkswagen 3L103373E Engine Cylinder Head for a 1.9 TDI (ALH) Engine**

#### **Pros:**

1. **Compatibility and Fitment** The 3L103373E cylinder head is a direct replacement for the 1.9 TDI ALH engine, ensuring an exact fit without modification. This eliminates the need for custom machining or additional parts, simplifying installation.

2. **Performance Potential** The 3L103373E is often associated with higher-performance applications, such as the 1.9 TDI VR6 or later 2.0 TDI engines, which means it may offer improved airflow, better combustion efficiency, or compatibility with upgraded components like turbochargers or injectors if modified.

3. **Durability and Build Quality** Volkswagen cylinder heads are generally well-built, and this part is no exception. If sourced from a reputable supplier (e.g., a remanufacturer or OEM dealer), it should be free from major defects like cracks or warping, which are common issues with aftermarket parts.

4. **Cost-Effective Replacement** Compared to a full engine replacement or a custom-built head, purchasing a used or remanufactured 3L103373E can be significantly cheaper. This makes it a viable option for restoring power or resolving issues like misfires, poor compression, or oil consumption.

5. **Access to Aftermarket Support** Since this head is used in multiple VW models, there is a strong aftermarket presence. This means you ll find gaskets, bolts, seals, and even upgraded components (e.g., forged valves, high-flow intake ports) to further enhance performance or reliability.

6. **Potential for Upgrades** If you plan to modify your engine (e.g., adding a turbo, increasing compression, or switching to direct injection), the 3L103373E provides a solid foundation. It can be port-matched, polished, or even swapped with a 2.0 TDI head for better airflow.

7. **Warranty Options** Some suppliers offer warranties on remanufactured parts, providing peace of mind against premature failure. OEM or dealer-sourced heads may also come with limited warranties.

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#### **Cons:**

1. **Potential for Mismatched Components** While the head fits mechanically, some internal components (e.g., valves, springs, or camshafts) may not match the original ALH engine specifications. This could lead to compatibility issues, such as incorrect valve lift, timing, or even damage to the camshaft if not properly checked.

2. **Risk of Counterfeit or Low-Quality Parts** The aftermarket for VW parts is flooded with counterfeit or poorly remanufactured items. A cheap or untested head may have hidden defects like cracks, warping, or improper sealing, leading to leaks, misfires, or catastrophic failure.

3. **Installation Complexity** Swapping a cylinder head requires disassembling the engine, removing the old head, and ensuring proper sealing with new gaskets, bolts, and torque specifications. Improper installation can lead to leaks, compression loss, or even engine damage.

4. **Compatibility with Original Engine Components** Some ALH-specific parts (e.g., injectors, fuel pump, or ECU tuning) may not work optimally with a 3L103373E head. You may need to upgrade or recalibrate the engine management system to avoid issues like poor fuel delivery or timing errors.

5. **Potential for Increased Oil Consumption** If the head is not properly sealed or if the valves are not correctly adjusted, oil can leak into the combustion chamber, leading to blue smoke and excessive oil consumption a common issue with modified or aftermarket heads.

6. **Limited Long-Term Reliability Data** While the 3L103373E is robust, its long-term reliability in a 1.9 TDI ALH engine may not be as well-documented as the original head. Some owners report issues like head gasket failures or exhaust manifold leaks when using non-OEM parts.

7. **Cost of Additional Modifications** If you choose to upgrade the head (e.g., porting, valve job, or turbo installation), these modifications can add significant cost. You may also need to invest in a new turbocharger, intercooler, or fuel system to match the head s potential.

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### **Conclusion**

The **3L103373E cylinder head is a viable option for a 1.9 TDI ALH engine**, particularly if you re looking to restore performance, replace a failed head, or prepare the engine for modifications. Its compatibility, durability, and aftermarket support make it a practical choice, especially when sourced from a trusted supplier. However, the risks of mismatched components, installation errors, and potential reliability issues cannot be ignored.

If your primary goal is **reliability and longevity**, sticking with an **OEM or high-quality remanufactured ALH-specific head** may be safer. If you re **pursuing performance gains or engine modifications**, the 3L103373E offers a solid platform but only if properly installed and supported by complementary upgrades.

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### **Recommendation**

1. **Verify the Head s Origin** Purchase from a **reputable remanufacturer** (e.g., Mahle, Fel-Pro, or a trusted VW specialist) or an **OEM dealer** to avoid counterfeit parts. Request documentation proving the head s authenticity and remanufacturing standards.

2. **Inspect for Damage** Before installation, check for **cracks, warping, or signs of overheating**. A professional inspection (e.g., magnetic particle testing) can uncover hidden defects.

3. **Upgrade Supporting Components**

- Replace **head gaskets, bolts, and seals** with high-quality aftermarket parts (e.g., Fel-Pro or ATE).

- Ensure **valve train compatibility** (springs, retainers, and camshaft timing).

- Consider **recalibrating the ECU** if modifying fueling or turbocharging.

4. **Professional Installation** If you lack experience, have a **VW specialist or engine machine shop** perform the swap to avoid common mistakes like improper torque or sealing issues.

5. **Monitor Post-Installation** After installation, watch for **oil leaks, misfires, or excessive smoke**, which could indicate compatibility or sealing problems. Address these promptly to prevent further damage.

6. **Consider a Full Engine Swap if Necessary** If your engine has **severe internal wear (rod bearings, crankshaft, or pistons)**, swapping just the head may not be sufficient. In such cases, a **complete engine rebuild or replacement** may be more cost-effective long-term.

**Final Verdict:**

- **For reliability-focused owners** Stick with an **OEM or high-quality ALH head**.

- **For performance enthusiasts** The **3L103373E is a strong choice**, provided you invest in proper installation and supporting modifications.

- **For budget-conscious buyers** A **remanufactured head from a trusted source** can be a cost-effective upgrade, but proceed with caution and thorough inspection.

Details:

AlSi10Mg is a high-performance, cast aluminum alloy commonly used in modern Volkswagen Group VW, Audi engine cylinder heads due to its excellent strength, thermal resistance, and ca stability. It is specifically used for high-output engines like the 1.8T 20V APX, BAM codes and various TSI/TFSI units.

part #: 3l103373e price

  • $212.50

specifications cylinderheapar:

  • for makes: Volkswagen
  • mpn: 3l103373e
  • part type: Engine Cylinder Head
  • material: Aluminum
  • country of origin: Germany

shipping cylinderheapar:

  • type: Fixed
  • class: Standard
  • service: FedEx Ground / FedEx Home Delivery
  • carrier: FedEx
  • transit: 3-7 Days
  • cost: $65.00

seller cylinderheapar:

  • rating: 98.7%
  • city: Los Angeles, California
  • # reviews: 9574

offer cylinderheapar:

  • quantity: 1
  • availability: In Stock
  • options: Ship-to-home
  • started: February 18, 2026
  • sold: 0

returns cylinderheapar:

  • policy: Returns Accepted
  • time: 14 Days
  • paid by: Buyer

general cylinderheapar:

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

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for makes: volkswagen, part type: engine cylinder head, country of origin: germany,
category: auto parts > car truck parts accessories > engines engine parts > cylinder heads, material: aluminum, sku: 11554110403737772,
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1 offer $212.50 USD
  • Used. Offer #1 priced at $212.50 + $65.00 shipping estimate = $277.50* total. It is specifically used for high-output engines like the 1.8T 20V (APX, BAM codes) and various TSI/TFSI units. AlSi10Mg is a high-performance, cast aluminum alloy commonly used in modern Volkswagen Group (VW, Audi) engine cylinder heads due to its excellent strength, thermal resistance, and castability.+$65.00 shipping

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