RELIANCE POWER PRODUCTS 6820N-SZ Crankshaft

( Brand: Reliance Power Products ), ( Manufacturer Part Number: 6820N-SZ ), ( Part Type: Crankshaft )

Review RELIANCE POWER PRODUCTS Crankshaft New

The **Reliance Power 6820N-SZ Crankshaft** is a precision-engineered, high-performance component designed to deliver exceptional durability, reliability, and efficiency in demanding industrial applications, particularly within diesel engines and heavy-duty machinery. Crafted from **AISI 4140 alloy steel**, this crankshaft undergoes a rigorous **nitriding process**, enhancing its surface hardness to resist wear, fatigue, and corrosion while maintaining an optimal balance of strength and flexibility. The nitrided case depth ensures superior resistance to pitting and scoring, making it ideal for continuous high-load operations in marine, power generation, and off-highway equipment.

The **6820N-SZ** features a **modular design** with **precision-machined journals and counterweights**, optimized for balanced rotational dynamics to minimize vibration and extend engine lifespan. The **main and connecting rod journals** are ground to tight tolerances, ensuring smooth operation and reduced friction, while the **integrated oil grooves** facilitate efficient lubrication, preventing premature wear in critical high-stress areas. The crankshaft s **fillet radii** are carefully contoured to distribute stress evenly, mitigating the risk of fatigue failure under extreme torque conditions.

This crankshaft is engineered to meet or exceed **ISO, ANSI, and DIN standards**, ensuring compatibility with a wide range of diesel engine configurations, including those used in **generators, pumps, and heavy-duty trucks**. Its **high fatigue strength** and **thermal stability** make it well-suited for applications requiring prolonged operation under fluctuating thermal and mechanical loads. Additionally, the **sealed bearing surfaces** and **precise dimensional consistency** contribute to reduced maintenance requirements and improved overall engine performance.

Whether integrated into a **marine propulsion system, industrial generator, or agricultural machinery**, the **Reliance Power 6820N-SZ Crankshaft** delivers uncompromising reliability, ensuring optimal power output and longevity in the most demanding environments. Its **superior metallurgical treatment** and **engineering precision** make it a trusted choice for manufacturers seeking a crankshaft that balances performance, durability, and cost-effectiveness.

**Pros and Cons of buying a Reliance Power 6820N-SZ Crankshaft**

The **Reliance Power 6820N-SZ** is a forged steel crankshaft designed for high-performance diesel engines, particularly those in marine, industrial, or heavy-duty applications. Below is a detailed analysis of its advantages and disadvantages.

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### **Pros**

1. **Superior Material Quality**

The crankshaft is made from **forged steel**, which provides excellent strength, durability, and resistance to fatigue. Forged components are less prone to cracking or deformation under high stress compared to castings, making them ideal for demanding applications.

2. **High Load-Bearing Capacity**

Engineered for **heavy-duty use**, this crankshaft is capable of handling high torque and RPM without excessive wear. It is well-suited for engines operating in harsh conditions, such as marine environments where corrosion and constant vibration are concerns.

3. **Precision Engineering**

Reliance Power is known for **tight tolerances and machining precision**, ensuring smooth operation and reduced friction. The crankshaft s balanced design minimizes vibration, which is critical for long-term reliability in engines.

4. **Compatibility with High-Performance Engines**

The **6820N-SZ** is designed to fit specific engine models, often those requiring **aftermarket upgrades** for increased power output. It is commonly used in **marine diesel engines, industrial generators, and heavy-duty truck engines**, where stock cranks may fail under extreme loads.

5. **Corrosion Resistance**

While not stainless steel, the **forged steel construction** with proper heat treatment offers better resistance to corrosion than some cast alternatives, especially when paired with protective coatings or lubricants.

6. **Aftermarket Support and Customization**

Reliance Power provides **OEM-level replacements** and sometimes offers **custom modifications** for specific engine builds. This makes it a viable option for enthusiasts and professionals looking to enhance engine performance.

7. **Long Service Life**

Due to its robust construction, a well-maintained **6820N-SZ crankshaft** can last **decades**, significantly reducing the need for frequent replacements and lowering long-term costs.

8. **Warranty and Reliability**

Reputable suppliers of this crankshaft often provide **warranties**, ensuring that defects in materials or workmanship are covered. Reliance Power is a well-established brand, which adds credibility to its products.

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### **Cons**

1. **High Cost**

Compared to **OEM (Original Equipment Manufacturer) cranks**, aftermarket forged cranks like the **6820N-SZ** are **significantly more expensive**. This makes them a **non-starter for budget-conscious buyers** or those working with limited funds.

2. **Installation Complexity**

Replacing a crankshaft is a **highly specialized job** that typically requires **machine shop expertise**. Improper installation can lead to **engine damage, misalignment, or premature failure**. Most users must rely on **professional mechanics**, adding to the overall cost.

3. **Limited Availability**

This crankshaft is **not a mass-produced item** and may not be readily available at local auto parts stores. Buyers often need to **order through specialty suppliers**, which can introduce delays and additional shipping costs.

4. **Potential for Overkill**

If the engine in question does **not** experience extreme stress (e.g., a lightly used truck engine), the **6820N-SZ may be unnecessarily robust**. In such cases, a **stock or slightly upgraded crank** might suffice, saving money without sacrificing performance.

5. **Weight Considerations**

Forged cranks are **heavier** than cast alternatives, which can affect **engine balance and fuel efficiency** in some applications. While this is rarely an issue in heavy-duty or marine use, it may be a minor drawback in performance-oriented vehicles.

6. **Compatibility Issues**

Not all engines can accommodate a **6820N-SZ crankshaft** due to **dimension mismatches** or **mounting differences**. Buyers must **verify exact specifications** before purchasing to avoid costly errors.

7. **Maintenance Requirements**

While durable, a forged crankshaft still requires **proper lubrication, regular inspections, and timely maintenance** to prevent issues like **bearing wear or rod bearing failure**. Neglecting maintenance can void warranties and reduce lifespan.

8. **Potential for Counterfeit or Low-Quality Replicas**

Due to its popularity in performance circles, there is a risk of **fake or substandard crankshafts** entering the market. Buyers must **purchase from reputable dealers** with proper certifications to ensure authenticity.

---

### **Conclusion**

The **Reliance Power 6820N-SZ crankshaft** is a **premium, high-performance component** designed for **extreme duty applications** where reliability and strength are paramount. Its **forged steel construction, precision engineering, and load-bearing capacity** make it an excellent choice for **marine engines, industrial generators, and heavily modified diesel applications**.

However, its **high cost, complex installation, and specialized use case** limit its appeal to **serious enthusiasts, fleet operators, or professionals** rather than casual buyers. If an engine operates under **moderate stress**, a **stock or moderately upgraded crank** may be sufficient, offering better cost efficiency.

For those who **require maximum durability and performance** particularly in **high-torque, high-RPM, or corrosive environments** the **6820N-SZ is a strong recommendation**. But potential buyers should **thoroughly research compatibility, budget for installation costs, and source from trusted suppliers** to avoid disappointment.

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### **Final Recommendation**

- You are running a **heavy-duty diesel engine** (marine, industrial, or high-performance truck).

- You need **maximum strength and longevity** under extreme conditions.

- You have **verified compatibility** with your engine and are prepared for **professional installation**.

- You are willing to **invest in a premium component** rather than a budget alternative.

- Your engine operates under **light to moderate loads** and does not require extreme durability.

- You are **working on a tight budget** and cannot afford the high cost of installation and the crankshaft itself.

- You lack access to **qualified mechanics** for proper installation and maintenance.

- You cannot **confirm exact fitment** before purchasing, risking wasted money.

For most **casual or lightly stressed engines**, a **reputable OEM or mid-range aftermarket crank** may be a more practical choice. However, for **serious power enthusiasts and professionals**, the **6820N-SZ remains one of the best forged crankshaft options available**.

Details:

Engineered using the latest technology to ensure product lasts longer in service. Made of high-quality components for durability, reliability, and performance. Engineered with a factory-like design for effortless installation, ensuring perfect match your vehicle. Designed specifically for trucks, trailers, and buses.

Reliance Power Products 6820N-SZ Crankshaft New: Part Number: Manufacturer. Manufactured following strict OE standards to work like the original component.

part #: 6820n prices

• $1521.78-$2649.00

specifications cranshafengin:

• brand: Reliance Power Products
• mpn: 6820n-sz
• part type: Crankshaft

seller cranshafengin:

• city: Los Angeles, California
• rating: 99.1%
• # reviews: 64077

returns cranshafengin:

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

shipping cranshafengin:

• class: Standard
• transit: 3-6 Days
• service: Standard
• type: Fixed
• cost: $0.00

offer cranshafengin:

• started: February 1, 2026
• availability: In Stock
• best offers: True
• sold: 0
• quantity: 3
• options: Ship-to-home

payments cranshafengin:

• wallet: Paypal
• other
• credit card: Mastercard

general cranshafengin:

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

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