HARLEY-DAVIDSON Mainshaft Retainer Seal Gask 35154-52 Retainer/seal/gask

( Brand: Harley-davidson ), ( Manufacturer Part Number: 3515452 ), ( Part Type: Seal ), ( Compatible Model: Ironhead Sportster, 35154-52 ), ( Material: Steel ), ( Vintage Part: Yes ), ( Country Of Origin: United States )

Review HARLEY DAVIDSON Vintage K m Used Mainshaft Retainer/seal/gask fits IRONHEAD SPORTSTER

The **Harley-Davidson 3515452 K-M Ironhead Sportster Mainshaft Retainer/Seal/Gasket** is a meticulously engineered, high-performance component designed exclusively for the iconic **Ironhead Sportster** engines, specifically the **351W (1970 1979)** and **351C (1979 1985)** models. This precision-crafted assembly serves as a critical sealing and retention system for the mainshaft, ensuring optimal lubrication, power transfer, and long-term reliability within the engine s crankcase. Crafted from durable, heat-resistant materials, the **mainshaft retainer** is engineered to securely hold the mainshaft in place while preventing axial movement, thereby reducing wear on critical bearing surfaces and maintaining proper alignment during high-stress operation. The accompanying **seal** is a robust, oil-tight barrier that prevents crankcase oil from leaking into the transmission housing, safeguarding internal components from contamination and ensuring smooth shifting. Meanwhile, the **gasket** provides an airtight and oil-sealed interface between the engine block and the transmission case, mitigating potential leaks that could compromise engine performance or lead to costly damage over time. This OEM-quality part is built to Harley-Davidson s exacting standards, guaranteeing a perfect fit with the original engine design while delivering the same level of durability and performance as the factory-specified components. Whether restoring a classic Ironhead or maintaining a high-mileage ride, this retainer/seal/gasket assembly is an essential upgrade for enthusiasts seeking to preserve the integrity of their engine s internal mechanics, extend component life, and uphold the legendary reliability that Harley-Davidson Sportsters are renowned for.

### **Pros and Cons of Buying a Harley-Davidson 3515452 K-M Ironhead Sportster Mainshaft Retainer/Seal/Gasket Set**

1. **Direct OEM Replacement** This part is manufactured by Harley-Davidson, ensuring compatibility with your Ironhead Sportster engine. It is designed to meet the same specifications as the original components, reducing the risk of fitment issues.

2. **Reliability and Durability** Harley-Davidson parts are built to withstand the demands of motorcycle engines, particularly the robust Ironhead V-twin. A quality mainshaft retainer, seal, and gasket set helps maintain proper lubrication and sealing, reducing the likelihood of internal engine wear or failure.

3. **Prevents Leaks and Contamination** The gasket and seals in this set are engineered to prevent oil leaks and contamination of critical engine components. A failing gasket or seal can lead to oil leaks, reduced compression, or even catastrophic engine damage if not addressed promptly.

4. **Easy Installation** The retainer, seal, and gasket are designed for straightforward installation, especially if you have some mechanical experience. Harley-Davidson provides clear documentation, and many riders find the process manageable with the right tools.

5. **Cost-Effective Long-Term Solution** While the upfront cost may seem high, replacing worn or damaged components with genuine Harley parts extends the life of your engine. This can save money in the long run by avoiding more extensive repairs down the line.

6. **Maintains Engine Performance** Properly functioning seals and gaskets ensure optimal engine performance, including smooth operation, efficient power delivery, and reduced friction. This contributes to a more enjoyable riding experience.

7. **Warranty Coverage** If purchased directly from Harley-Davidson or an authorized dealer, this part may come with a warranty, providing peace of mind in case of defects.

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1. **Higher Upfront Cost** Compared to aftermarket alternatives, Harley-Davidson OEM parts can be more expensive. This may be a deterrent for riders on a tight budget or those looking for a quick, low-cost fix.

2. **Limited Availability** Depending on your location, finding this specific part may require ordering online or visiting a specialty motorcycle parts store. Availability can sometimes be delayed, especially if the part is discontinued or in low stock.

3. **Installation Complexity** While the installation is manageable for experienced mechanics, it can be challenging for beginners. Improper installation such as overtightening or misalignment could lead to damage or premature failure of the components. This may require professional help, adding to the cost.

4. **Potential for Counterfeit Parts** If purchasing from third-party sellers (e.g., eBay, Amazon, or unverified online marketplaces), there is a risk of receiving counterfeit or low-quality parts. Always verify the seller s reputation and authenticity of the product.

5. **Time-Consuming Process** Replacing these components often requires disassembling parts of the engine, which can take several hours. This downtime may be inconvenient for riders who want to minimize engine work.

6. **Mixed Reviews on Longevity** While Harley parts are generally reliable, some riders report that even OEM components may wear out relatively quickly in high-mileage or heavily modified engines. This could lead to repeated replacements over time.

7. **Environmental and Disposal Concerns** If you re environmentally conscious, disposing of old gaskets and seals may require careful handling, as they can contain materials that are not easily recyclable.

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The **Harley-Davidson 3515452 K-M Ironhead Sportster mainshaft retainer/seal/gasket set** is a **high-quality, reliable OEM solution** for maintaining your engine s integrity. It offers long-term benefits in terms of performance, durability, and compatibility, making it a strong choice for riders who prioritize authenticity and longevity. However, the **higher cost, potential installation challenges, and availability issues** may make it less ideal for those seeking a quick or budget-friendly fix.

If you re comfortable with mechanical work and want to ensure your engine runs smoothly for years to come, this part is **highly recommended**. For riders who prefer a more affordable or easier alternative, aftermarket options (such as those from **Torque, Fel-Pro, or Sealed Power**) may be worth considering though always verify their compatibility and quality before purchasing.

- You value genuine Harley components and long-term reliability.

- You re willing to invest in quality and have the time/skills for installation (or can hire a professional).

- Your engine is high-mileage or heavily used, and you want to prevent further damage.

- You re on a tighter budget and can find a reputable brand with good reviews.

- You re unsure about installation and prefer a simpler process.

- You re looking for a temporary fix while saving for OEM parts.

Always **purchase from a trusted source** (authorized dealers, Harley-Davidson s official website, or well-reviewed specialty shops) to avoid counterfeit or subpar parts. If in doubt, consult a mechanic before proceeding.

Details:

SOLD EACH, Vintage Harley K-M IRONHEAD SPORTSTER CHOICE OF Used 35154-52 MAINSHAFT RETAINER AND NEW SEAL GASKET. NOT SURE YOU ARE GETTING 1 WHAT SHOWN IN PICTURES. WHICH 1 DO YOU WANT.

part #: 3515452 prices

• $10.36-$23.58

specifications cyclevintagee:

• for models: Ironhead, Sportster
• for makes: Harley
• brand: Harley-davidson
• mpn: 3515452
• part type: Seal
• compatible model: Ironhead Sportster, 35154-52
• material: Steel
• vintage part: Yes
• country of origin: United States

general cyclevintagee:

• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
• condition: Used

offer cyclevintagee:

• quantity: 5
• availability: In Stock
• started: April 9, 2026
• options: Ship-to-home
• best offers: True
• sold: 0

payments cyclevintagee:

• wallet: Google-pay
• credit card: Discover
• other

seller cyclevintagee:

• # reviews: 13983
• rating: 99.7%
• city: Bloomington, Illinois

shipping cyclevintagee:

• class: Standard
• cost: $11.65
• type: Calculated
• carrier: USPS
• transit: 2-6 Days
• service: USPS Ground Advantage

returns cyclevintagee:

• policy: No Returns

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