NATIONAL 471504 Willys Front Crankshaft Seal 724956138869

( Brand: National ), ( Manufacturer Part Number: 471504 ), ( Product Type: Engine ), ( UPC: 724956138869 ), ( Fitment Type: Direct Replacement ), ( Partslink Number: 426877, 556672r91, 8004885, Dx23256, Dx28649, A7146, 306711 ), ( Compatible Model S : Willys, Commando, Cj5, Cj6, Cj6a, Cj5a, Cj3 ), ( Product Subtype: Crankshafts ), ( Placement On Vehicle: Front ), ( Type: Seals Gaskets ), ( Product Details: Engine Crankshaft Seal ), ( Engine Version: 304 Amc V8, 258 Amc Straight-6, 232 Amc Straight-6 ), ( Department: Replacement )

Review NATIONAL Jeep Willys Front Crankshaft Seal fits 1943–1958

The **National 471504 Front Crankshaft Seal** is a precision-engineered, high-performance replacement part meticulously designed to restore optimal sealing integrity and longevity to the front crankshaft area of vintage Jeep Willys models produced between **1943 and 1958**, including the iconic Willys MB, CJ-2A, CJ-3A, and early CJ-3B variants. Crafted from **high-quality nitrile rubber**, this seal is engineered to withstand the demanding conditions of classic engine bays, where exposure to heat, vibration, and fuel or oil splatter is common. The seal features a **reinforced lip design** that ensures a tight, consistent seal against the crankshaft, preventing leaks that could lead to oil contamination, reduced engine efficiency, or premature wear on critical components like the timing chain or alternator pulley. Its **metal-reinforced backing plate** provides structural stability, allowing it to maintain its shape under the pressure of the engine s internal forces while resisting deformation over time. Ideal for both restoration projects and routine maintenance, this seal is a direct-fit replacement for the original equipment manufacturer (OEM) part, ensuring compatibility with the Willys engine s unique dimensions and tolerances. Whether you re tackling a full engine rebuild or simply addressing a persistent oil leak, the **National 471504** delivers reliable performance, helping to extend the life of your Jeep s drivetrain and preserve its classic charm. Built to meet or exceed OEM specifications, it offers a balance of durability and ease of installation, making it a trusted choice among Jeep enthusiasts and mechanics alike.

### Pros and Cons of buying a National 471504 Front Crankshaft Seal for a Jeep Willys (1943 1958)

1. **Compatibility** The National 471504 is a direct replacement for the front crankshaft seal used in Jeep Willys models from 1943 to 1958, ensuring an exact fit without modifications.

2. **Reliability** National is a well-known brand in the automotive aftermarket, known for producing durable and high-quality seals. Their products are often tested for longevity and performance.

3. **Ease of Installation** Since it is a standard replacement part, it should fit without requiring extensive modifications to the engine or surrounding components.

4. **Prevents Leaks** A failing front crankshaft seal can cause oil leaks, which can lead to engine damage if left unaddressed. Replacing it with a new, high-quality seal helps maintain proper lubrication and prevents contamination.

5. **Cost-Effective** Compared to rebuilding or replacing the entire front end or crankshaft, a seal replacement is a relatively inexpensive fix, saving time and money in the long run.

6. **Widely Available** As a common part for vintage Jeeps, it can be found at most auto parts stores, online retailers, or specialty restoration shops, making it easy to source.

7. **Improved Engine Performance** A properly sealed crankshaft prevents oil from leaking into the transmission or differential, which can improve drivability and extend the life of related components.

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1. **Potential for Counterfeit Parts** Since vintage Jeep parts are in demand, there is a risk of purchasing a counterfeit or low-quality seal that may fail prematurely. Buying from a reputable seller (e.g., RockAuto, eBay verified sellers, or specialty shops) reduces this risk.

2. **Installation Challenges** If the seal is not installed correctly, it may leak or fail early. This requires careful handling, proper tools (like a seal driver or puller), and possibly some experience with engine work.

3. **Age of the Part** While the seal itself is new, the surrounding components (e.g., the crankshaft or seal housing) may be worn or damaged. If these are not addressed, the new seal may not last as long as expected.

4. **Limited Lifespan** Even high-quality seals have a finite lifespan, especially in high-mileage or heavily used vehicles. Regular maintenance and inspection are still necessary.

5. **Cost of Additional Materials** Beyond the seal, you may need gasket maker, a new oil pump seal (if required), or other consumables to ensure a clean installation, adding to the overall cost.

6. **Risk of Over-Tightening** If the seal housing or crankshaft flange is overtightened during installation, it could cause warping or damage, leading to leaks or further issues.

7. **Availability of Alternatives** While the National 471504 is a good choice, other brands (e.g., Fel-Pro, Sealed Power, or aftermarket options) may offer slightly different materials or warranties. Some owners prefer aftermarket seals for better performance in extreme conditions.

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The National 471504 front crankshaft seal is a solid, reliable choice for restoring or maintaining a Jeep Willys from 1943 to 1958. Its direct compatibility, brand reputation, and ease of installation make it a practical solution for preventing oil leaks and protecting engine components. However, the success of the replacement depends on sourcing a genuine part, careful installation, and addressing any underlying issues with the surrounding components.

For most Jeep owners, the benefits outweigh the drawbacks, especially when compared to the potential damage caused by a failing seal. To maximize longevity, pair the seal replacement with a thorough inspection of the oil pump, crankshaft, and related seals.

- **Buy from a trusted source** (e.g., RockAuto, eBay verified sellers, or a local Jeep restoration shop) to avoid counterfeit parts.

- **Follow installation instructions carefully**, using proper tools to avoid damaging the seal or surrounding components.

- **Consider upgrading other related seals** (e.g., oil pump seal) if they appear worn during the process.

- **Monitor for leaks** after installation and address any issues promptly.

- **If unsure about installation**, consult a mechanic experienced with vintage Jeeps to ensure a proper job.

For most DIYers with moderate mechanical skill, the National 471504 is a worthwhile investment to extend the life of their Jeep s front end.

Details:

Material: Nitrite. Designed utilizing the latest technology, this product by National features premium quality and will perform better than advertised. Compatible with wide range of fluids. width : 0.312.

Order from the comfort of your home or office. Front Crankshaft Seal 471504 by National. Inside Diameter: 1.750. Specifications: Thickness: 0.312.

The finest quality at a great price.

part #: 471504 prices

• $10.00-$89.99

specifications cranshafengin:

• for makes: Jeep
• for years: 1943-1958
• brand: National
• mpn: 471504
• product type: Engine
• upc: 724956138869
• fitment type: Direct Replacement
• partslink number: 426877, 556672r91, 8004885, Dx23256, Dx28649, A7146, 306711
• compatible model s : Willys, Commando, Cj5, Cj6, Cj6a, Cj5a, Cj3
• product subtype: Crankshafts
• placement on vehicle: Front
• type: Seals Gaskets
• product details: Engine Crankshaft Seal
• engine version: 304 Amc V8, 258 Amc Straight-6, 232 Amc Straight-6
• department: Replacement

general cranshafengin:

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

payments cranshafengin:

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

seller cranshafengin:

• city: Rockville Centre, New York
• # reviews: 161884
• rating: 99.3%

offer cranshafengin:

• quantity: 5
• options: Ship-to-home
• started: June 9, 2026
• availability: In Stock
• sold: 0

shipping cranshafengin:

• service: FedEx Ground / FedEx Home Delivery
• transit: 3-7 Days
• carrier: FedEx
• type: Calculated
• cost: $20.85
• class: Standard

returns cranshafengin:

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

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