BFO A5VMB7 Impeller Repair Kit 50-70HP 46-77177A3

( Brand: Bfo ), ( Manufacturer Part Number: A5VMB7 ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Country Of Origin: China ), ( Fitment: For Mercury 30-70hp 2-4 Cylinder Outboard Motors 1977-1997 ), ( Oe/part Number: 46-77177a3, 77177a3, 18-3324, 12100 ), ( Type: Outboard Water Pump Impeller Repair Kit ), ( Warranty: 1 Year )

Review BFO Impeller Repair Kit Mercury 50-70hp Cyl fits 1979–1990

The **BFO A5VMB7 Impeller Repair Kit** is a meticulously engineered solution designed specifically for Mercury outboard motors ranging from **50 to 70 horsepower**, produced between **1979 and 1990**, corresponding to the model series **46-77177A3**. This high-quality repair kit is crafted to restore optimal performance to the impeller assembly, a critical component responsible for driving water flow through the engine s cooling and propulsion systems. The kit includes a **precision-machined replacement impeller**, typically crafted from durable marine-grade materials such as **cast aluminum or reinforced plastic**, ensuring resistance to corrosion, wear, and the harsh conditions of saltwater environments. The impeller s unique **pump-like blade design** is optimized for efficient water circulation, reducing strain on the engine while maximizing thrust and fuel efficiency key factors in maintaining the longevity and reliability of older Mercury models.

Beyond the impeller itself, the BFO A5VMB7 kit is thoughtfully assembled to address common wear points that plague aging outboards. It features **sealing gaskets and O-rings**, often made from **EPDM or nitrile rubber**, to prevent leaks at critical interfaces, such as the impeller shaft and housing seals. These components are engineered to withstand repeated exposure to water, vibration, and temperature fluctuations, which are inherent challenges in marine applications. The kit may also include **impeller nuts or bolts**, often with **self-locking features**, to ensure a secure and vibration-resistant fit, mitigating the risk of loosening during operation. For added convenience, some versions incorporate **anti-seize compounds or lubricants**, applied to threaded surfaces to prevent galling and simplify future disassembly.

What sets this repair kit apart is its **direct compatibility with the Mercury 50-70HP legacy series**, where impeller failure can lead to overheating, reduced power output, or even complete engine shutdown. The kit s **universal fitment** within the specified model range makes it an ideal choice for boat owners, mechanics, and DIY enthusiasts seeking a cost-effective alternative to full engine overhauls. Installation is straightforward, requiring only basic tools, and the kit s modular design allows for quick replacement without the need for specialized equipment. By restoring the impeller to factory specifications, this repair kit not only enhances the motor s performance but also extends its operational lifespan, ensuring that your Mercury outboard remains a dependable powerhouse for years to come. Whether tackling routine maintenance or addressing a performance decline, the BFO A5VMB7 Impeller Repair Kit delivers the precision, durability, and ease of use needed to keep your vessel running smoothly on the water.

**Pros and Cons of buying a BFO A5VMB7 Impeller Repair Kit for Mercury 50-70HP (1979-1990) Engines**

### **Pros**

1. **Compatibility** The kit is specifically designed for Mercury outboard motors from 1979 to 1990, covering the 50-70HP range. This ensures a proper fit without the need for modifications, reducing the risk of improper installation.

2. **Cost-Effective Repair** Replacing an entire impeller can be expensive, especially if the engine is older. This repair kit allows you to restore the impeller to functional condition at a fraction of the cost of a new part.

3. **Prevents Further Damage** A damaged impeller can lead to reduced engine performance, fuel inefficiency, or even internal engine wear. Repairing it early can prevent more costly repairs down the line.

4. **Easy Installation** The kit typically includes clear instructions and may require minimal tools, making it accessible for DIYers without extensive mechanical experience.

5. **Improves Engine Performance** A properly repaired impeller ensures optimal water flow, which can restore power, throttle response, and fuel efficiency to the engine.

6. **Availability of Parts** Since this is a well-known repair kit, spare components (like gaskets or bolts) are often easy to source if needed during installation.

7. **Long-Term Solution** Unlike temporary fixes (such as sealing cracks with epoxy), this kit provides a durable repair that can extend the life of the impeller for years, depending on usage.

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### **Cons**

1. **Skill Dependency** While the repair is manageable, improper installation (e.g., misalignment, incorrect torque, or improper sealing) can lead to leaks or further damage. Those without mechanical experience may struggle.

2. **Time-Consuming** Removing and reinstalling the impeller requires disassembling parts of the lower unit, which can take several hours, especially for someone unfamiliar with the process.

3. **Potential for Additional Wear** If the impeller damage is severe (e.g., deep cracks, warping, or corrosion), the repair may not fully restore performance, and the engine may still exhibit inefficiencies.

4. **Limited Warranty** Unlike a new OEM part, the repair kit may not come with a warranty, leaving the buyer responsible for any failures post-installation.

5. **Tool Requirements** Basic tools (sockets, wrenches, torque wrench, and possibly a puller for stubborn impellers) are needed. Those without these may need to purchase them separately.

6. **Risk of Over-Tightening** Improperly torqued bolts can strip threads or damage the lower unit housing, leading to leaks or structural issues.

7. **Environmental Factors** If the engine has been exposed to saltwater or harsh conditions, corrosion may persist even after repair, potentially shortening the lifespan of the fixed impeller.

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### **Conclusion**

The **BFO A5VMB7 Impeller Repair Kit** is a practical and cost-effective solution for restoring a damaged impeller in Mercury 50-70HP outboards from 1979 to 1990. It offers a **long-term fix** that can improve engine performance and prevent further damage, making it ideal for DIYers comfortable with basic mechanical work. However, it requires **careful installation** to avoid complications, and those without experience may benefit from consulting a professional.

For **casual boaters or those unfamiliar with engine repairs**, the kit is still a strong option if they take their time and follow instructions precisely. For **serious mechanics or those who frequently work on outboards**, the repair is straightforward and well-worth the investment.

If the impeller is **heavily damaged or the engine shows signs of internal wear**, however, a full inspection of the lower unit may be advisable before proceeding with the repair.

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### **Recommendation**

- You have basic mechanical skills and access to tools.

- The impeller damage is superficial (cracks, minor warping, or worn edges).

- You want to avoid the higher cost of a new impeller or full lower unit replacement.

- You re comfortable following step-by-step instructions carefully.

- The impeller is **severely cracked, corroded, or deformed**, making repair unreliable.

- You lack confidence in disassembling/reassembling the lower unit.

- The engine has **other underlying issues** (e.g., worn seals, bearing failure) that should be addressed simultaneously.

**Final Verdict:** The **BFO A5VMB7 kit is a smart, budget-friendly choice** for restoring performance to a Mercury 50-70HP outboard, provided the repair is executed correctly. For those unsure about the process, consulting a marine mechanic for guidance or a partial installation may be wise.

Details:

Fast Shipping. Material Rubber Stainless Steel Plastic. Application: for Mercury Water Pump Kit 40 50 60 70HP 2 Stark 1977-1997. >>you might also like.

For Mercury 402, 40 hp 2 CYL. 4860103 thru 5556229 1978-1979. Specification: Type:Outboard Water Pump Impeller Repair Kit. Best Costumer Service. It begins from the date purchased.

For Mercury 35 hp 2 CYL. 6445653 Up 1984 - 1989. Factory Warranty. For Mercury 30 hp JET 0C159200 thru 0G589999 1989 -1997. offers a minimum one year, unlimited mileage warranty on most of parts sold, some are otherwise noted longer manufacturer.

part #: a5vmb7 price

• $27.67

specifications ouboaen:

• for makes: Mercury
• for years: 1979-1990
• brand: Bfo
• mpn: A5vmb7
• california prop 65 warning: California Prop 65 Warning
• country of origin: China
• fitment: For Mercury 30-70hp 2-4 Cylinder Outboard Motors 1977-1997
• oe/part number: 46-77177a3, 77177a3, 18-3324, 12100
• type: Outboard Water Pump Impeller Repair Kit
• warranty: 1 Year

shipping ouboaen:

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

seller ouboaen:

• city: Houston, Texas
• # reviews: 27196
• rating: 99.6%

returns ouboaen:

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

payments ouboaen:

• wallet: Google-pay
• other
• credit card: Diners-club

offer ouboaen:

• availability: In Stock
• started: May 30, 2026
• quantity: 10
• options: Ship-to-home
• sold: 0

general ouboaen:

• Boat Parts > Outboard Engines Components > Cooling Systems
• condition: New

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