NATIONAL 710621 Rear Crankshaft Seal 019826108913

( Brand: National ), ( Manufacturer Part Number: 710621 ), ( Product Type: Engine ), ( UPC: 019826108913 ), ( Fitment Type: Direct Replacement ), ( Partslink Number: 122791hc0a, 122793hc0b, 122793va0a, 12279et000, 7701065057 ), ( Compatible Make S : Nissan, Infiniti, Infiniti ), ( Compatible Model S : Altima, Sentra, Rogue, Versa Note, Versa, Juke, Cube, Rogue Sport ), ( Product Subtype: Crankshafts ), ( Placement On Vehicle: Rear ), ( Type: Seals Gaskets ), ( Product Details: Engine Crankshaft Seal ), ( Department: Replacement )

Review NATIONAL Nissan Rear Crankshaft Seal fits ALTIMA 2019–2020

The **National 710621 Rear Crankshaft Seal** is a high-performance, precision-engineered replacement part designed specifically for the **2019-2020 Nissan Altima**, ensuring optimal sealing and longevity for the vehicle s rear main bearing housing. Crafted from **high-quality nitrile rubber** reinforced with a durable fiberglass core, this seal is engineered to withstand extreme temperatures, heavy loads, and constant engine stress, making it an ideal choice for both maintenance and performance applications. The seal features a **precision-molded lip design** that guarantees a tight, leak-proof fit against the crankshaft, preventing oil leaks and maintaining proper lubrication within the engine s critical components. Its **robust construction** resists premature wear and deformation, even under prolonged high-RPM conditions or in demanding driving scenarios, such as towing or aggressive acceleration. The **OEM-compatible dimensions** ensure an exact fit with the original equipment manufacturer s specifications, eliminating the risk of misalignment or improper installation. Whether used in routine maintenance or as a direct replacement for a failing seal, this **National seal** delivers reliable performance, helping to extend the life of the engine and reduce the likelihood of costly internal damage. Built to meet or exceed factory standards, it is a trusted choice for mechanics and DIY enthusiasts alike, offering peace of mind with every installation.

**Pros and Cons of buying a National 710621 Rear Crankshaft Seal for a 2019-2020 Nissan Altima**

1. **Compatibility** The National 710621 is specifically designed for the 2019-2020 Nissan Altima, ensuring a proper fit without modification. This reduces the risk of installation issues or improper sealing.

2. **Quality Materials** National is a reputable brand known for manufacturing durable automotive seals. The rubber compound used in this seal is likely formulated to withstand engine heat, oil pressure, and vibration, which are critical for longevity.

3. **Ease of Installation** Since it is an OEM (Original Equipment Manufacturer) or high-quality aftermarket part, it should align well with the engine s mounting surfaces, making installation less prone to errors compared to generic or poorly fitted alternatives.

4. **Warranty Coverage** National parts often come with a warranty (typically 1-2 years), providing some assurance against premature failure due to manufacturing defects.

5. **Prevents Costly Damage** A failing rear main seal can lead to oil leaks, which may damage the transmission, exhaust system, or engine components. Replacing it proactively can save money in the long run by avoiding secondary repairs.

6. **Performance Consistency** Unlike cheaper or counterfeit parts, a National seal is less likely to fail prematurely, ensuring reliable operation between oil changes.

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1. **Higher Upfront Cost** Compared to generic or no-name brands, National parts are typically more expensive. For a single seal, this may not be a major concern, but if purchasing as part of a larger repair, the cost adds up.

2. **Potential Overkill for Minor Issues** If the seal failure is due to a minor issue (e.g., a loose bolt or minor wear), replacing just the seal may not address the root cause. However, this is more of a general maintenance consideration than a flaw in the part itself.

3. **Installation Complexity** While the seal itself fits well, replacing it often requires removing the transmission or engine components, which may be labor-intensive. If the owner lacks mechanical experience, professional installation is recommended, adding to the total cost.

4. **Availability and Lead Times** Depending on the region, National parts may not always be in stock at local auto parts stores. Online retailers may have longer shipping times, which could delay repairs.

5. **Mixed Reviews on Durability** While National is generally reliable, some users report that aftermarket seals (even from reputable brands) may not last as long as OEM seals. However, this varies by vehicle and driving conditions.

6. **Potential for Counterfeit Parts** Purchasing from untrusted sellers (e.g., third-party online marketplaces) could result in counterfeit or substandard seals. Always buy from authorized dealers or well-reviewed retailers to avoid this risk.

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The National 710621 rear crankshaft seal for the 2019-2020 Nissan Altima is a strong choice for reliability and compatibility. Its quality materials, proper fit, and warranty coverage make it a safer option than cheaper alternatives, especially for owners who prioritize long-term performance and peace of mind. However, the higher cost and potential installation challenges should be weighed against the benefits.

If the primary concern is preventing oil leaks and avoiding transmission or engine damage, the National seal is a worthwhile investment. For those on a tight budget, it may be worth comparing prices with other high-quality brands (e.g., Fel-Pro, Gates, or ATE) to ensure the best value without sacrificing quality.

- **Buy from an authorized dealer or a trusted online retailer** (e.g., RockAuto, Amazon, or local Nissan dealership parts department) to avoid counterfeit parts.

- **Consider professional installation** if the owner lacks experience with engine/transmission work, as improper handling can void warranties or cause further damage.

- **Check for bundled deals** some retailers offer discounts when purchasing the seal along with gaskets or related components.

- **Verify the part number** before purchasing to ensure it matches the exact model year and engine variant (e.g., CVT vs. automatic transmission differences may apply).

For most Altima owners, the National 710621 is a **reliable and recommended choice** for a rear crankshaft seal replacement, balancing quality and compatibility effectively.

Details:

Designed utilizing the latest technology, this product by National features premium quality and will perform better than advertised. Rear Crankshaft Seal 710621 by National. Material: . The finest quality at a great price.

width : 0.335. Order from the comfort of your home or office. Specifications: Thickness: 0.335. Compatible with wide range of fluids.

Inside Diameter: 3.307.

part #: 710621 prices

• $14.87-$45.99

specifications cranshafengin:

• for models: Altima
• for makes: Nissan
• for years: 2019-2020
• brand: National
• mpn: 710621
• product type: Engine
• upc: 019826108913
• fitment type: Direct Replacement
• partslink number: 122791hc0a, 122793hc0b, 122793va0a, 12279et000, 7701065057
• compatible make s : Nissan, Infiniti, Infiniti
• compatible model s : Altima, Sentra, Rogue, Versa Note, Versa, Juke, Cube, Rogue Sport
• product subtype: Crankshafts
• placement on vehicle: Rear
• type: Seals Gaskets
• product details: Engine Crankshaft Seal
• department: Replacement

returns cranshafengin:

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

seller cranshafengin:

• city: Saint Paul, Minnesota
• rating: 99.1%
• # reviews: 151740

shipping cranshafengin:

• cost: $18.29
• class: Standard
• carrier: FedEx
• transit: 2-4 Days
• type: Calculated
• service: FedEx Ground / FedEx Home Delivery

general cranshafengin:

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

payments cranshafengin:

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

offer cranshafengin:

• quantity: 2
• options: Ship-to-home
• sold: 0
• started: March 17, 2026
• availability: In Stock

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