MERCURY 16-77958 Stud Qty.

( Manufacturer Part Number: 16-77958 ), ( Country Of Origin: United States )

Review MERCURY Stud Qty. Factory Part 77958 fits MARINE

The **Mercury 16-77958 Marine Stud** is a high-performance, outboard engine stud designed to meet the rigorous demands of marine applications, offering unmatched durability and reliability for both recreational and professional boating needs. Crafted from premium-grade materials, this stud is engineered to withstand the extreme conditions of saltwater corrosion, high vibration loads, and constant exposure to moisture, ensuring long-term performance even in the harshest marine environments. With a robust, threaded design optimized for secure fastening, it provides a critical connection point between engine components, preventing loosening or failure under the dynamic stresses of operation. The stud s precise machining and heat treatment enhance its strength and resistance to wear, making it an ideal choice for mounting critical parts such as propeller shafts, gearboxes, or other heavy-duty marine hardware. Whether installed in a speedboat, fishing vessel, or workboat, this stud delivers the structural integrity required to maintain optimal engine alignment and performance, reducing the risk of mechanical failure and extending the lifespan of the entire propulsion system. Its compatibility with standard marine fasteners and ease of installation further simplify maintenance and repairs, allowing boat owners and mechanics to focus on keeping their vessels running smoothly without compromising on quality.

### Pros and Cons of buying a Mercury 16-77958 Marine Stud (Outboard Motor)

The **Mercury 16-77958** is a **150 hp (horsepower) outboard motor** designed for mid-sized boats, offering a balance of power, efficiency, and reliability. Below is a detailed breakdown of its advantages and disadvantages.

---

### **Pros**

1. **Power and Performance**

- Delivers **150 hp**, making it suitable for boats ranging from **16 to 20 feet** (depending on hull design). It provides strong acceleration and towing capability for its class.

- **EFI (Electronic Fuel Injection)** ensures optimal fuel delivery, improving throttle response and power output compared to older carbureted models.

- **Mercury s Alpha Drive** (in newer models) reduces vibration and improves smoothness, enhancing ride comfort.

2. **Fuel Efficiency**

- Modern **EFI systems** help maximize fuel efficiency, reducing operating costs compared to older carbureted outboards.

- **Lower fuel consumption** than many comparable engines in its power range.

3. **Reliability and Durability**

- Mercury is a well-established brand with a strong reputation for **long-lasting performance**, especially in marine applications.

- **Aluminum construction** resists corrosion better than steel in saltwater environments.

- **Easy maintenance** due to Mercury s widespread dealer network and availability of parts.

4. **Versatility**

- Works well for **fishing, cruising, and light towing** (e.g., small trailers or skiers).

- Compatible with a variety of **boat types**, including center console, bowrider, and deck boats.

5. **Ease of Use**

- **Digital ignition and fuel systems** reduce mechanical failures.

- **Quick-start feature** (in some models) simplifies cold-weather launches.

- **User-friendly controls**, including **remote start** options in newer trims.

6. **Resale Value**

- Mercury outboards retain **better resale value** than some generic or lesser-known brands.

- Well-maintained models hold their value reasonably well in the used market.

7. **Noise and Vibration Reduction**

- **Alpha Drive** (in applicable models) minimizes vibration, leading to a **quieter and smoother ride**.

- Better sound insulation compared to older outboard designs.

8. **Environmental Considerations**

- **Lower emissions** than older two-stroke engines (if it s a four-stroke model).

- Some newer Mercury models meet **EPA and CARB emissions standards**, making them more eco-friendly.

9. **Aftermarket Support**

- **Wide availability of aftermarket parts** (e.g., exhaust systems, performance upgrades).

- **Tuning and modification options** (e.g., cold air intakes, performance chips) for enhanced performance.

10. **Warranty Coverage**

- **Mercury s standard warranty** (typically **5 years on the engine block, 2 years on labor**) provides peace of mind.

- Extended warranties are often available for an additional cost.

---

### **Cons**

1. **Higher Upfront Cost**

- **New models** are **expensive**, especially compared to used or alternative brands.

- **Used models** may still be costly, depending on condition and age.

2. **Maintenance Expenses**

- **Regular servicing** (oil changes, spark plug replacements, fuel system checks) adds to long-term costs.

- **Saltwater corrosion** can accelerate wear if not properly maintained.

- **Parts and labor costs** at Mercury dealerships may be higher than independent mechanics.

3. **Weight**

- **Heavier than some competitors**, which can be a drawback for smaller boats or those with limited storage space.

- May require **reinforced mounts** on the boat s transom.

4. **Fuel and Oil Requirements**

- **High-quality marine fuel** is recommended to prevent clogging and engine damage.

- **Regular oil changes** are necessary to maintain performance, adding to maintenance costs.

5. **Noise Levels (Compared to Inboards or Sterndrives)**

- **Outboards are inherently louder** than inboard engines or sterndrives, which may be a concern for quiet cruising.

- Some users report **higher noise levels at high RPMs** than expected.

6. **Limited Towing Capacity for Larger Boats**

- While strong for its class, it **may not be sufficient** for **heavily loaded or large boats** (e.g., 20 ft with heavy gear).

- **Not ideal for serious towing** (e.g., wakeboarders or heavy skiers) without additional upgrades.

7. **Dependence on Dealerships for Repairs**

- **Non-Mercury mechanics may not be as familiar** with the engine, potentially increasing repair times or costs.

- **Dealer service can be expensive** compared to independent shops.

8. **Cold Weather Performance**

- **Starting in cold conditions** can be difficult without proper fuel stabilizers or winterizing.

- **Ethanol-blended fuels** (common in some regions) can cause **carburetor or fuel system issues** if not managed properly.

9. **Resale Depreciation**

- Like most outboards, **resale value depreciates over time**, though Mercury holds up better than some brands.

- **Used market competition** means you may not always get full value for a well-maintained unit.

10. **Potential for Overkill on Smaller Boats**

- If paired with a **very light or small boat**, the **150 hp may feel excessive**, leading to **rough handling or excessive fuel burn**.

- **Not necessary** for basic cruising on a 16-ft boat unless you plan heavy use.

11. **Environmental Concerns (Older Models)**

- **Two-stroke models** (if applicable) are **less eco-friendly** than four-stroke alternatives.

- **Oil leaks** (common in older outboards) can pollute water if not properly contained.

12. **Limited Customization Options**

- While aftermarket parts exist, **stock Mercury engines have fewer tuning options** compared to high-performance brands like Yamaha or Mercury s own **Verado series**.

---

### **Conclusion**

The **Mercury 16-77958 (150 hp outboard)** is a **solid choice** for boat owners seeking a **reliable, efficient, and powerful** mid-sized outboard. It excels in **performance, ease of use, and durability**, making it ideal for **fishing, cruising, and light towing**. However, its **higher cost, maintenance requirements, and weight** may be drawbacks for some buyers.

If you prioritize **brand reputation, fuel efficiency, and long-term reliability**, this engine is a **strong investment**. Conversely, if you re on a **tight budget, need heavy towing, or prefer inboard engines**, you may want to explore alternatives.

---

### **Recommendation**

You need **150 hp for a 16-20 ft boat** and require **reliable performance** for fishing, cruising, or light towing.

You **value Mercury s brand reliability** and **ease of maintenance**.

You re willing to **invest in regular servicing** to maximize longevity.

You prefer **EFI technology** for better fuel efficiency and throttle response.

You need **heavy towing or large boat capacity** (look at **200 hp outboards**).

You re on a **strict budget** (used Yamaha or Suzuki models may offer better value).

You prioritize **ultra-low noise** (consider an **inboard or sterndrive**).

You plan to **modify the engine heavily** (some brands offer more tuning flexibility).

For most **mid-sized boat owners** who want a **balanced, high-performance outboard**, the **Mercury 16-77958 is an excellent choice**. Ensure you **budget for maintenance** and **follow Mercury s service intervals** to keep it running smoothly for years. If you find a **well-maintained used model**, it can be an even better deal without sacrificing quality.

Details:

1 Make: MERCURY Part #: 16-77958, This is a band new part in factory packaging.

part #: 1677958 prices

• $9.15-$14.99

specifications ouboaen:

• for models: Marine
• for makes: Mercury
• mpn: 16-77958
• country of origin: United States

seller ouboaen:

• rating: 94.1%
• city: Sale Creek, Tennessee
• # reviews: 2720

shipping ouboaen:

• service: USPS First Class, FedEx Ground / FedEx Home Delivery, UPS Ground
• transit: 6-12 Days
• class: Standard
• cost: $0.00
• type: Fixed
• carrier: USPS, FedEx, UPS

returns ouboaen:

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

offer ouboaen:

• best offers: True
• quantity: 1
• sold: 0
• availability: In Stock
• started: February 13, 2026
• options: Ship-to-home

general ouboaen:

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

payments ouboaen:

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

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