NATIONAL 37NSHTM53 Front Crankshaft Seal Commando 226 CJ5A CJ6A

( Brand: National ), ( Manufacturer Part Number: 37NSHTM53 ), ( Type: Crankshaft Seal ), ( Placement On Vehicle: Front ), ( Fits 1: 1959-1973 Jeep Cj5 ), ( Fits 2: 1959-1971 Jeep Cj6 ), ( Fits 3: 1959-1966 Jeep Cj3 ), ( Fit Note: Engine Crankshaft Seal Nitrile ), ( Manufacturer Warranty: 12 Month Warranty ), ( Attention: Please Read All Notes To Confirm Fitment ), ( Cs-sku: 400 )

Review NATIONAL Front Crankshaft Seal 226 Commando fits CJ5 CJ6 CJ3

The **National 37NSHTM53 Front Crankshaft Seal** is a high-performance, precision-engineered replacement part designed specifically for the iconic **Jeep CJ-5, CJ-6, CJ-226, CJ-3, CJ-5A, and CJ-6A Commando** models, ensuring reliable sealing and longevity under demanding off-road and heavy-duty conditions. Crafted from **high-quality rubber compound**, this seal is engineered to withstand extreme temperatures, aggressive driving environments, and prolonged exposure to moisture, dust, and debris common challenges faced by rugged Jeep enthusiasts. The **37NSHTM53** features a **reinforced lip design** that maintains optimal compression against the crankshaft, preventing oil leaks while minimizing friction and wear, which is critical for maintaining engine efficiency and preventing costly internal damage. Its **durable metal backing** provides structural integrity, ensuring the seal remains securely positioned within the front cover, even under vibration and shock loads encountered during off-roading or towing. This seal is a **direct-fit replacement**, eliminating the need for modification or adaptation, making it an ideal choice for both restoration projects and routine maintenance. Whether you're restoring a classic Jeep to its original glory or upgrading an existing setup for enhanced reliability, the **National 37NSHTM53** delivers a dependable, long-lasting solution that upholds the performance standards expected from Jeep s legendary off-road machines.

### **Pros and Cons of Buying a National 37NSHTM53 Front Crankshaft Seal for Jeep CJ5/CJ6 (226/227/228/327/328/428 Engines)**

1. **High Quality and Durability** National is a well-respected brand known for manufacturing reliable engine components, including crankshaft seals. This seal is designed to withstand the demands of Jeep s older engines, reducing the risk of premature failure.

2. **Direct Fitment** The part number **37NSHTM53** is specifically engineered for Jeep CJ5/CJ6 models with **226/227/228/327/328/428** inline-six engines, ensuring compatibility without modifications.

3. **Pre-Lubricated & Easy Installation** Many National seals come pre-greased, simplifying installation and reducing the chance of improper sealing due to dry contact.

4. **Widely Available** As a common replacement part, this seal is stocked by most Jeep and performance parts suppliers, making it easy to source.

5. **Cost-Effective for Long-Term Reliability** While the upfront cost may be slightly higher than generic alternatives, a quality seal like this can prevent costly engine damage from oil leaks, justifying the investment.

6. **Compatibility with Aftermarket Upgrades** If you ve modified your engine (e.g., turbocharging, forced induction, or high-performance applications), a National seal is less likely to fail under increased stress compared to cheaper alternatives.

7. **Good Warranty Support** National typically offers warranties on their seals, providing peace of mind in case of defects.

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1. **Higher Upfront Cost** Compared to generic or no-name seals, National parts are more expensive, which may be a deterrent for budget-conscious buyers.

2. **Potential Overkill for Stock Applications** If your engine is in pristine condition and you ve never had seal issues, a premium seal may not be strictly necessary, making it an unnecessary expense for some owners.

3. **Installation Complexity** Replacing a front crankshaft seal requires removing the timing cover, water pump, and possibly the alternator, which can be labor-intensive for inexperienced DIYers. If you re not comfortable with engine work, professional installation may be required, adding to the cost.

4. **Risk of Contamination During Installation** If debris or old gasket material enters the crankshaft area during removal, it could cause premature wear on the new seal, even if it s high-quality.

5. **Limited Availability in Some Regions** While widely stocked in the U.S. and Canada, availability may be more limited in other markets, requiring special ordering.

6. **Potential for Counterfeit Parts** As with any premium brand, there is a risk of purchasing counterfeit National seals, which may not meet quality standards. Always buy from reputable suppliers.

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The **National 37NSHTM53 front crankshaft seal** is an excellent choice for Jeep CJ5/CJ6 owners who prioritize **long-term reliability, ease of installation, and compatibility with both stock and modified engines**. While it comes at a higher cost than generic alternatives, its **superior materials, pre-lubrication, and brand reputation** make it a strong investment to prevent oil leaks and potential engine damage.

However, if you re working on a **strictly stock engine with no history of seal failures** and are on a tight budget, a **high-quality generic or aftermarket seal** (from brands like **Fel-Pro, Sealed Power, or Gates**) could be a reasonable alternative just ensure it s the correct part number for your engine displacement.

For most serious Jeep owners, **the National seal is the best balance of performance and peace of mind**, especially if you plan to keep the vehicle long-term or have performed engine modifications.

- **Buy from a trusted supplier** (e.g., **RockAuto, Summit Racing, or a local Jeep specialty shop**) to avoid counterfeit parts.

- **Follow proper installation procedures**, including cleaning the crankshaft area thoroughly and using the correct sealant if required.

- **Consider professional installation** if you re not experienced with engine work to ensure a leak-free result.

- **If on a tight budget**, research **Fel-Pro or Sealed Power alternatives** (e.g., **Fel-Pro 22000 or Sealed Power 10000**) as reliable mid-range options.

Ultimately, **the National seal is the safest and most durable choice** for most CJ5/CJ6 owners, making it the **strongest recommendation** for those who want long-term reliability.

Details:

Good low temperature capability. 1966-1968 Jeep CJ6A 2.2L 4 Cl. Temperature range: 40F to 225F / 40C 107C. Delivers quality and reliable performance for every type of repair.

1959-1966 Jeep CJ3 2.2L 4 Cl. Front Crankshaft Seal 37NSHTM53 for CJ5 CJ6 6 226 CJ3 CJ5A CJ6A Commando: Position: Brand: National condition: New, Notes Engine Nitrile Features: Design type: spring loaded; multi-lip. Low swell in hydrocarbon fluids.

part #: 37nshtm53 prices

• $17.32-$22.07

specifications cranshafengin:

• for models: Cj5, Cj6, Cj3
• brand: National
• mpn: 37nshtm53
• type: Crankshaft Seal
• placement on vehicle: Front
• fits 1: 1959-1973 Jeep Cj5
• fits 2: 1959-1971 Jeep Cj6
• fits 3: 1959-1966 Jeep Cj3
• fit note: Engine Crankshaft Seal Nitrile
• manufacturer warranty: 12 Month Warranty
• attention: Please Read All Notes To Confirm Fitment
• cs-sku: 400

offer cranshafengin:

• quantity: 1
• started: May 12, 2026
• options: Ship-to-home
• sold: 0
• availability: In Stock

shipping cranshafengin:

• service: Standard
• type: Fixed
• class: Standard
• cost: $0.00
• transit: 3-7 Days

returns cranshafengin:

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

payments cranshafengin:

• credit card: Discover
• wallet: Paypal
• other

general cranshafengin:

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

seller cranshafengin:

• rating: 97.3%
• # reviews: 57970
• city: ana, California

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