NATIONAL 227040 Rear Crankshaft Seal 724956075744 124

( Brand: National ), ( Manufacturer Part Number: 227040 ), ( Product Type: Engine ), ( UPC: 724956075744 ), ( Fitment Type: Direct Replacement ), ( Partslink Number: 40000040, 113105245f, 21011005160, 5096250290, 113105245j ), ( Compatible Make S : Fiat, Volkswagen ), ( Compatible Model S : 124, Strada, Karmann Ghia ), ( Fitnote: Enginedesignationname ), ( Product Subtype: Crankshafts ), ( Placement On Vehicle: Rear ), ( Type: Seals Gaskets ), ( Product Details: Engine Crankshaft Seal ), ( Department: Replacement )

Review NATIONAL Fiat 124 Rear Crankshaft Seal fits 1971–1983

The **National 227040** is a precision-engineered, high-performance **rear crankshaft seal** specifically designed for Fiat 124 models produced between **1971 and 1983**, including both the **sedan and hatchback variants**. This seal is a critical component of the engine s rear main bearing housing, ensuring a reliable, leak-free barrier between the lubricating oil and the crankshaft s rotating elements. Crafted from **high-quality elastomeric materials**, this seal is engineered to withstand the demanding conditions of high-speed operation, extreme temperatures, and prolonged exposure to engine oils, preventing premature wear and contamination. Its **reinforced lip design** provides superior sealing performance, reducing the risk of oil leaks that could lead to costly engine damage or reduced efficiency. The **interference-fit lip construction** ensures a tight, consistent seal across the crankshaft s journal, minimizing friction while maintaining durability over thousands of miles. Whether installed in a classic Fiat 124 restored for concours-level show quality or a daily-driven example, this seal delivers **long-lasting reliability**, helping to preserve the engine s integrity and extend its operational lifespan. Backed by National s reputation for automotive excellence, this part is a trusted choice for mechanics and enthusiasts seeking a direct-fit, high-performance solution that meets or exceeds OEM specifications.

Buying the **National 227040 rear crankshaft seal** for a **Fiat 124 (1971 1983)** has its advantages and disadvantages, depending on your priorities budget, reliability, ease of installation, and long-term performance. Below is a detailed breakdown:

### **Pros of buying a National 227040 Seal**

1. **Proven Compatibility** The National 227040 is a widely recognized OEM or high-quality aftermarket part specifically designed for the Fiat 124 s rear crankshaft seal application. It fits the engine bay s dimensions and mounting points correctly, reducing the risk of installation errors.

2. **Durability and Performance** National is a reputable brand known for manufacturing durable seals that resist oil leakage and wear over time. A quality seal minimizes the risk of premature failure, which is critical in older engines prone to oil leaks.

3. **Easier Installation** Since this is a direct replacement part, it should align properly with the engine s mounting points, reducing the need for modifications or custom fitting. This makes the job more straightforward for DIYers, especially if you re replacing the seal as part of a larger overhaul (e.g., rear main seal replacement).

4. **Widely Available** As a common part for the Fiat 124, the National 227040 can be found in most auto parts stores, online marketplaces (eBay, Amazon, RockAuto), and specialty European auto supply shops. This ensures you won t face long wait times or sourcing difficulties.

5. **Cost-Effective for the Quality** While not the cheapest option, it strikes a balance between affordability and reliability. Compared to OEM seals (which may be harder to find or more expensive), this aftermarket part offers a cost-effective alternative without sacrificing performance.

6. **Reduces Long-Term Maintenance Issues** A failing rear crankshaft seal can lead to oil leaks, engine damage, or even a seized crankshaft if ignored. Replacing it with a reliable seal like the National 227040 helps prevent these costly problems down the line.

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### **Cons of buying a National 227040 Seal**

1. **Price Point** While not excessively expensive, the National 227040 may cost more than generic or no-name brands. For budget-conscious buyers, cheaper alternatives (even if lower quality) might be tempting, but this could lead to premature failure.

2. **Potential Counterfeit or Low-Quality Copies** Purchasing from untrusted sellers (especially online) increases the risk of receiving a counterfeit or substandard part. Always buy from verified suppliers or reputable dealers to avoid this issue.

3. **Installation Complexity** Replacing a rear crankshaft seal is a labor-intensive job that often requires removing the engine from the vehicle or at least the transmission. If you re not experienced with engine work, this could be a challenging DIY project, potentially leading to mistakes or damage.

4. **Limited Longevity Compared to OEM** While the National 227040 is durable, it may not last as long as an original OEM seal if the engine has significant wear (e.g., worn crankshaft journals or a damaged seal housing). In such cases, the seal may fail sooner than expected.

5. **Availability of Alternatives** Other brands (e.g., Fel-Pro, Gates, or even OEM replacements from reputable sources) may offer comparable or slightly better seals. Researching alternatives could lead to a better fit for your specific engine condition.

6. **Potential for Overkill** If your engine is high-mileage or has other failing components (e.g., bearings, timing chain), replacing just the seal may not be sufficient. A full engine rebuild might be more cost-effective in the long run.

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### **Conclusion and Recommendation**

The **National 227040 rear crankshaft seal** is a **solid choice** for most Fiat 124 owners replacing a leaking or worn seal. Its **reliability, ease of installation, and widespread availability** make it a practical option for both DIYers and mechanics. However, it s not the only good choice **Fel-Pro or Gates seals** are also highly regarded for their quality and longevity.

- **Reliability and ease of use**, the National 227040 is an excellent selection.

- **Long-term durability**, consider a higher-end brand like Fel-Pro (if budget allows).

- **Budget constraints**, ensure you buy from a trusted seller to avoid counterfeit parts.

Buy the **National 227040** if you want a **proven, mid-range quality seal** that balances cost and performance. Pair it with **high-quality gaskets, a torque wrench, and proper lubrication** during installation to maximize its lifespan. If your engine is in poor condition, consider addressing other wear issues (e.g., bearings, timing components) simultaneously to avoid future problems.

For best results, **source the part from a reputable supplier** (e.g., RockAuto, local European auto shops, or trusted online retailers) and **follow proper installation procedures** to ensure a leak-free seal.

Details:

Material: Polyacrylamide. Order from the comfort of your home or office. Rear Crankshaft Seal 227040 by National. width : 0.394.

The finest quality at a great price. Compatible with wide range of fluids. Inside Diameter: 2.756. Specifications: Thickness: 0.394.

Designed utilizing the latest technology, this product by National features premium quality and will perform better than advertised.

part #: 227040 prices

• $13.95-$41.68

specifications cranshafengin:

• for makes: Fiat
• for years: 1971-1983
• brand: National
• mpn: 227040
• product type: Engine
• upc: 724956075744
• fitment type: Direct Replacement
• partslink number: 40000040, 113105245f, 21011005160, 5096250290, 113105245j
• compatible make s : Fiat, Volkswagen
• compatible model s : 124, Strada, Karmann Ghia
• fitnote: Enginedesignationname
• product subtype: Crankshafts
• placement on vehicle: Rear
• type: Seals Gaskets
• product details: Engine Crankshaft Seal
• department: Replacement

seller cranshafengin:

• rating: 99.4%
• # reviews: 8616
• city: Fort Smith, Arkansas

returns cranshafengin:

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

general cranshafengin:

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

payments cranshafengin:

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

offer cranshafengin:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• quantity: 5
• started: March 10, 2026

shipping cranshafengin:

• type: Calculated
• transit: 3-7 Days
• class: Standard
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• cost: $18.99

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