MERCURY 8M0057670 Outboard Balance Shaft 150 4-STROKE

( Manufacturer Part Number: 8M0057670 ), ( Part Type: Hp Shaft ), ( Country Of Origin: United States )

Review MERCURY 150 Hp 4-stroke Outboard Balance Shaft Assembly fits 2017

The **Mercury 8M0057670 2017 150 Horsepower Four-Stroke Outboard with Balance Shaft** is a high-performance marine engine designed to deliver unmatched reliability, efficiency, and power for a wide range of recreational and performance boats. Part of Mercury s renowned Verado family, this 150 hp outboard combines cutting-edge engineering with a refined balance shaft system to minimize vibration, enhance smoothness, and extend the engine s lifespan. The balance shaft technology, a hallmark of Mercury s advanced outboard designs, counteracts the natural torsional forces generated by the crankshaft, resulting in a noticeably quieter, more stable ride ideal for cruising, fishing, or high-speed maneuvering. Built with a forged crankshaft and precision-machined components, this engine ensures exceptional durability and the ability to handle demanding conditions with ease, whether you re tackling rough seas or maintaining steady speed across open water.

Under the hood, the 2017 150 hp Mercury outboard features a **2.8-liter, liquid-cooled, four-cylinder, four-stroke engine** with direct fuel injection, which optimizes fuel efficiency and reduces emissions while maximizing power output. The fuel-injected system delivers precise fuel delivery, improving throttle response and ensuring consistent performance across varying loads. The engine s **EFI (Electronic Fuel Injection) system** also enhances cold-start reliability, making it easier to launch in cooler temperatures without the hassle of manual priming. Complementing this is a **digital ignition system** that provides optimal spark timing for better combustion efficiency and smoother operation, further contributing to the engine s reputation for dependability.

For those who demand both power and precision, this outboard is equipped with **Mercury s IntelliShift transmission**, a fully electronic shift system that allows for seamless gear changes with the push of a button. This feature not only simplifies operation but also reduces wear on the transmission by eliminating the need for manual shifting, which can be particularly beneficial during prolonged cruising or high-speed runs. The engine s **torsion dampener** further enhances comfort by absorbing vibrations, ensuring a quieter cabin experience for passengers. Additionally, the **low-profile exhaust system** is designed to minimize drag while maintaining optimal performance, making it an excellent choice for boats where aerodynamics matter.

Maintenance and longevity are key considerations for any marine engine, and the 2017 Mercury 150 hp outboard addresses these concerns with thoughtful design choices. The engine features a **self-lubricating lower unit**, reducing the need for frequent greasing and simplifying upkeep. Its **corrosion-resistant materials**, including stainless steel and aluminum components, are engineered to withstand the harsh marine environment, while the **sealed gearcase** helps prevent water ingress, a common issue in older outboard models. The engine also includes a **fuel gauge and low-oil pressure warning system**, providing critical alerts to prevent potential damage from neglect. For added convenience, the **quick-release steering system** allows for easy removal and storage, making maintenance tasks more manageable.

Whether you re powering a **mid-sized cruiser, a performance fishing boat, or a wakeboard rig**, the Mercury 8M0057670 delivers a compelling blend of power, refinement, and reliability. Its **150 horsepower** output provides ample thrust for towing, planing, or maintaining high speeds without excessive fuel consumption, while the balance shaft ensures a ride that s as smooth as it is powerful. With Mercury s reputation for innovation and quality, this outboard stands as a dependable workhorse for anglers, boaters, and enthusiasts who demand the best in marine performance. Built to last, this engine is not just a powerplant it s a testament to Mercury s commitment to engineering excellence in the world of outboard motors.

### **Pros and Cons of Buying a Mercury 8M0057670 (2017, 150 HP, 4-Stroke Outboard with Balance Shaft)**

#### **Pros**

1. **Reliability and Durability**

The 2017 Mercury 150 HP 4-stroke outboard is part of a well-established line known for robust construction and long-term performance. Mercury s balance shaft technology helps reduce vibration and wear, contributing to a smoother ride and extended engine life compared to older models without this feature.

2. **Fuel Efficiency**

As a 4-stroke engine, it offers better fuel efficiency than 2-stroke outboards, which are known for consuming fuel at a much higher rate. This makes it more cost-effective for frequent use, especially on longer trips.

3. **Lower Emissions and Environmental Friendliness**

4-stroke outboards produce fewer emissions than 2-strokes, aligning with stricter environmental regulations. This can be beneficial if you operate in areas with emission restrictions or prefer a cleaner-running engine.

4. **Easier Maintenance**

4-stroke engines have fewer moving parts in the combustion process, leading to simpler maintenance routines. Oil changes are more straightforward, and there s no need for frequent carburetor or spark plug adjustments like in some 2-stroke models.

5. **Quieter Operation**

The balance shaft and 4-stroke design reduce noise levels compared to older 2-stroke outboards, making it more pleasant for both the operator and passengers.

6. **Resale Value**

Mercury s reputation for quality and the balance shaft feature may help retain a higher resale value compared to older or less sophisticated outboards.

7. **Compatibility with Modern Boats**

The 150 HP rating is versatile for a range of boats, from mid-sized fishing vessels to cruisers, making it a practical choice for various applications.

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#### **Cons**

1. **Higher Initial Cost**

A 2017 Mercury 150 HP 4-stroke with a balance shaft will likely be more expensive upfront compared to a used 2-stroke outboard of similar power. The balance shaft adds complexity and cost to manufacturing, which is reflected in the price.

2. **Potential for Higher Maintenance Costs Over Time**

While 4-strokes are generally easier to maintain, some components (e.g., balance shaft bearings, fuel injection systems) can be more expensive to repair if they fail. Older models may also require updates to keep up with modern technology.

3. **Weight**

Mercury s 150 HP 4-stroke outboards are heavier than many 2-stroke models, which could be a drawback if you re operating a lighter boat or need to transport the engine frequently.

4. **Cold Weather Performance**

4-stroke engines can be less forgiving in cold climates. They may require additional pre-start procedures (e.g., priming, extended warm-up) to prevent issues like fuel starvation or poor cold starts.

5. **Limited Availability of Parts**

As this is a slightly older model (2017), finding replacement parts or service centers may be more challenging compared to newer engines. Always verify that parts and support are readily available in your region.

6. **Potential for Hidden Issues**

Like any used purchase, there s a risk of undiagnosed problems (e.g., balance shaft wear, fuel system leaks, or electrical gremlins). A thorough pre-purchase inspection is critical to avoid costly repairs.

7. **Learning Curve for Some Features**

Modern 4-stroke outboards with balance shafts and electronic controls may require familiarization with new diagnostics or troubleshooting methods, which could be a minor inconvenience for operators used to simpler engines.

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### **Ending Conclusion**

The **Mercury 8M0057670 (2017, 150 HP, 4-stroke with balance shaft)** is a solid choice for those seeking a reliable, fuel-efficient, and lower-emission outboard. Its balance shaft reduces vibration and wear, while the 4-stroke design offers practical advantages over older 2-stroke models. However, the higher upfront cost, potential maintenance complexities, and cold-weather limitations should be carefully considered.

If you prioritize **long-term reliability, fuel savings, and reduced emissions** and can afford the initial investment, this outboard is a strong contender. Conversely, if you re on a tight budget or need an engine for extreme cold or high-performance applications, you may want to explore alternatives or ensure the engine has been thoroughly inspected.

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### **Recommendation**

- You need a dependable, low-maintenance outboard for daily or frequent use.

- Fuel efficiency and emissions compliance are important to you.

- You re willing to invest in a well-built engine with modern features like the balance shaft.

- You ve had a **pre-purchase inspection** by a marine mechanic to verify its condition, especially focusing on the balance shaft, fuel system, and electrical components.

- You re operating in very cold climates without proper winterization procedures.

- You re unable to afford the upfront cost or potential future maintenance expenses.

- You find a well-maintained alternative (e.g., a newer model or a different brand) at a significantly lower price with comparable features.

**Final Tip:** Always negotiate based on the inspection findings and consider financing options if needed. Pair this purchase with a **marine insurance policy** and a **maintenance plan** to maximize its lifespan.

Details:

2017 Mercury Marine 150 4-Stroke Balance Shaft Assembly this was removed from a non-running motor, I told is in good condition and it looks but have no way to verify this, please buy rebuild or use for parts - includes everything inside the box black fuel rail pipe not included. Bid Win only if you pay for it.

part #: 8m0057670 prices

• $275.00-$385.00

specifications ouboaen:

• for makes: Mercury
• for years: 2017
• mpn: 8m0057670
• part type: Hp Shaft
• country of origin: United States

general ouboaen:

• condition: Used
• Boat Parts > Outboard Engines Components > Other

payments ouboaen:

• other
• credit card: Diners-club
• wallet: Paypal

seller ouboaen:

• rating: 100.0%
• city: Fort Lauderdale, Florida
• # reviews: 2553

offer ouboaen:

• sold: 0
• options: Ship-to-home
• quantity: 1
• started: April 8, 2026
• availability: In Stock

shipping ouboaen:

• service: Standard
• class: Standard
• type: Fixed
• cost: $20.00
• transit: 5-8 Days

returns ouboaen:

• policy: No Returns

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