1. Engine Crankshafts Products
  2. sku: 18694401778916632
  3. NOK W0133-1642251-NOK

NOK W0133-1642251-NOK Front Crankshaft Seal

fits model: Miata. make: Mazda. year: 1990–2005.

W0133-1642251-nok Nok For Mazda Miata 1990-2005 Front Crankshaft Seal

( Brand: Nok ), ( Manufacturer Part Number: W0133-1642251-NOK ), ( Part Type: Seal Crankshaft ), ( Product Type: Engine ), ( California Prop 65 Warning: Cancer And Reproductive Harm ), ( Fitment Type: Direct Replacement ), ( Compatible Make S : Mazda, Kia ), ( Compatible Model S : Miata, Protege, Mx-3, 323, Sephia, Rio, Spectra ), ( Fitnote: Manufactured After September. Large Journal. ), ( Product Subtype: Crankshafts ), ( Product Details: Engine Crankshaft Seal ), ( Department: Replacement )

Review NOK Mazda Front Crankshaft Seal fits MIATA 1990–2005

The **NOK W0133-1642251 front crankshaft seal** is a high-performance, precision-engineered replacement part specifically designed to restore optimal sealing integrity and longevity to the front crankshaft area of Mazda MX-5 Miata models produced between 1990 and 2005. Crafted from NOK s proprietary **high-quality nitrile rubber compound**, this seal is engineered to withstand the demanding conditions of high-speed rotation, extreme temperatures, and the aggressive chemical environment found in modern engine bays, ensuring reliable protection against oil leaks and contamination. The seal features a **reinforced lip design** with a **self-aligning mechanism**, which compensates for minor shaft misalignment and wear, reducing the risk of premature failure and extending the service life of the seal. Its **metal-reinforced outer diameter** provides structural stability, preventing deformation under pressure, while the **optimized lip geometry** ensures a tight, consistent seal against the crankshaft, minimizing oil seepage and maintaining peak engine performance. Ideal for both original equipment replacement (OEM) and aftermarket applications, this seal is compatible with the **1.6L and 1.8L inline-four engines** found in the NA, NB, NC, and ND generations of the Mazda MX-5, offering a direct drop-in fit without the need for modification. Whether used in routine maintenance, performance upgrades, or repair scenarios, the NOK W0133-1642251 delivers superior durability and leak resistance, helping to preserve engine cleanliness and extend the lifespan of critical components like the timing belt and pulleys. Backed by NOK s reputation for automotive excellence, this seal is a trusted choice for mechanics and enthusiasts seeking a dependable, long-lasting solution for their Mazda Miata.

### Pros and Cons of buying a NOK W0133-1642251-NOK Front Crankshaft Seal for a Mazda MX-5 Miata (1990 2005)

#### **Pros:**

1. **Compatibility** This seal is specifically designed for the front crankshaft pulley (front cover) on the Mazda MX-5 Miata from 1990 to 2005, ensuring a proper fit without modification.

2. **Quality Material** NOK (Nippon Seals) is a well-known manufacturer of high-quality seals, offering durability and resistance to oil and heat, which is crucial for a crankshaft seal.

3. **Ease of Installation** The seal is pre-lubricated and designed for straightforward installation, reducing the risk of damage during fitting.

4. **Prevents Leaks** A faulty crankshaft seal can cause oil leaks, which can lead to engine damage if left unchecked. Replacing it with a reliable seal helps maintain engine integrity.

5. **Warranty Coverage** NOK products often come with a warranty, providing peace of mind against premature failure.

6. **Aftermarket Trust** Many mechanics and DIY enthusiasts trust NOK for critical engine components, making it a safer choice than generic or unknown brands.

#### **Cons:**

1. **Cost** Compared to generic or lower-quality seals, NOK parts can be more expensive, which may be a consideration for budget-conscious buyers.

2. **Potential Overkill for Some** If the seal failure is minor or the engine is near the end of its lifespan, some may question whether the investment is justified.

3. **Installation Complexity** While the seal itself is easy to install, the process of removing the front cover and pulley can be time-consuming and requires some mechanical skill. Improper handling could damage the crankshaft pulley or timing components.

4. **Availability** Depending on location, NOK parts may not be as widely stocked as generic alternatives, requiring special ordering in some cases.

5. **Mixed Reviews on Longevity** Some users report that while the seal is reliable, it may not last indefinitely, especially if the engine has other underlying issues (e.g., oil sludge, worn bearings).

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### **Conclusion:**

The NOK W0133-1642251-NOK front crankshaft seal is a strong choice for Mazda MX-5 Miata owners (1990 2005) due to its compatibility, quality, and reputation for preventing leaks. While it may be pricier than generic options, the long-term benefits such as avoiding costly engine damage from oil leaks often outweigh the initial cost. However, if budget is a major concern or the engine is aging, it s worth considering whether the seal is the only issue (e.g., checking for oil sludge or worn bearings) before committing to a replacement.

### **Recommendation:**

If you re experiencing oil leaks from the front crankshaft pulley area or suspect seal failure, **proceed with purchasing the NOK seal** if you value reliability and longevity. Ensure you also:

- Use high-quality gasket maker or RTV silicone for sealing the front cover.

- Follow proper installation procedures to avoid damaging the timing belt or pulley.

- Consider replacing the timing belt and water pump if they re due for service (commonly recommended every 60,000 100,000 miles).

For those on a tight budget, a high-quality generic seal (e.g., from Fel-Pro or Gates) could be a cost-effective alternative, but NOK remains the safer, long-term choice. If the engine is severely worn, address other potential issues (e.g., oil changes, sludge removal) to maximize the seal s lifespan.

Details:

Made from high-quality materials for ultimate durability. Manufactured to meet or exceed strict quality requirements. This product is distinguished by total quality assurance, unsurpassed anybody else. Front Crankshaft Seal W NOK by NOK.

Right for your vehicle and lifestyle. Specifications: Inside Diameter: 37mm. Features: designed to deliver trouble-free, consistent performance.

part #: w01331642251 price

  • $10.31

specifications cranshafengin:

  • for models: Miata
  • for makes: Mazda
  • for years: 1990-2005
  • brand: Nok
  • mpn: W0133-1642251-nok
  • part type: Seal Crankshaft
  • product type: Engine
  • california prop 65 warning: Cancer And Reproductive Harm
  • fitment type: Direct Replacement
  • compatible make s : Mazda, Kia
  • compatible model s : Miata, Protege, Mx-3, 323, Sephia, Rio, Spectra
  • fitnote: Manufactured After September. Large Journal.
  • product subtype: Crankshafts
  • product details: Engine Crankshaft Seal
  • department: Replacement

offer cranshafengin:

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

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  • city: Shawnee, Kansas
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shipping cranshafengin:

  • cost: $11.00
  • service: UPS Ground
  • class: Standard
  • type: Fixed
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general cranshafengin:

  • condition: New
  • Car Truck Parts Accessories > Engines Engine Parts > Crankshafts
for models: miata, for makes: mazda, for years: 1990-2005, part type: seal crankshaft, product type: engine, california prop 65 warning: cancer and reproductive harm, fitment type: direct replacement, compatible make s: mazda, kia, compatible model s: miata, protege, mx-3, 323, sephia, rio, spectra, fitnote: manufactured after september. large journal., product subtype: crankshafts, product details: engine crankshaft seal, department: replacement,
category: auto parts > car truck parts accessories > engines engine parts > crankshafts, sku: 18694401778916632,
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1 offer $10.31 USD
  • New. Offer #1 priced at $10.31 + $15.00 shipping estimate = $25.31* total. This product is distinguished by total quality assurance, unsurpassed by anybody else. Front Crankshaft Seal ( -NOK) by NOK .+$15.00 shipping

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