MERCURY 1667-9011J Lower Unit

( Manufacturer Part Number: 1667-9011J ), ( Part Type: Hp Unit )

Review MERCURY 100 Hp Lower Unit fits 1989

The **Mercury 1667-9011J 1989 HP Lower Unit** is a robust and meticulously engineered marine gearcase designed to deliver exceptional performance and reliability for high-performance outboard motors, particularly those in the 150 200 horsepower class. Built to withstand the demands of heavy-duty fishing, cruising, and high-speed applications, this lower unit features a **cast aluminum housing** that balances strength with weight efficiency, ensuring durability without compromising maneuverability. The **90-degree gearcase** is a hallmark of Mercury s engineering prowess, providing a compact yet powerful transmission that optimizes torque transfer while minimizing drag. This design is complemented by a **helical cut gear system**, which enhances smoothness and reduces wear, making it ideal for extended hours on the water.

At the heart of this lower unit lies a **precision-machined bronze propeller shaft**, designed to handle the high torque output of the 1989 HP engine with ease. The shaft is supported by **high-capacity needle bearings** and **sealed pillow blocks**, ensuring minimal friction and prolonged longevity even under the most demanding conditions. The **oil-cooled gearcase** incorporates a robust oil pump and filtration system, maintaining optimal lubrication and cooling to prevent overheating and premature wear. This feature is particularly critical for high-performance applications where sustained power output is essential.

The **1667-9011J** is equipped with a **reverse lever mechanism** that operates smoothly, allowing for effortless shifting between forward and reverse modes a necessity for anglers and boaters who require quick and precise control. The gearcase also features a **sealed and pressurized oil system**, which helps prevent leaks and contamination, further extending the life of the internal components. For added convenience, the unit includes a **quick-disconnect oil filler cap**, simplifying routine maintenance tasks such as oil changes.

Built to meet Mercury s stringent quality standards, this lower unit is compatible with a range of **1989 HP outboard motors**, including those from the **Mercury 150 200 HP series**, and is designed to integrate seamlessly with the engine s power delivery system. Whether used in a **fishing vessel, speedboat, or offshore cruiser**, this gearcase is engineered to deliver **reliable, high-performance operation** while minimizing maintenance requirements. With its **durable construction, efficient cooling, and precise engineering**, the **Mercury 1667-9011J 1989 HP Lower Unit** remains a sought-after component for enthusiasts and professionals who demand nothing less than excellence in marine propulsion.

### Pros and Cons of Buying a Mercury 1667-9011J (1989 HP Lower Unit)

1. **Compatibility and Availability of Parts** The Mercury 1667-9011J is a well-documented lower unit, meaning replacement parts, seals, bearings, and gaskets are widely available. This makes repairs and maintenance more straightforward compared to less common units.

2. **Proven Reliability** Mercury marine lower units from the late 1980s were built to last with proper maintenance. Many still function well in older boats, especially if they were well-maintained by the previous owner.

3. **Lower Cost Compared to New Units** Purchasing a used or refurbished version of this lower unit is significantly cheaper than buying a brand-new one, making it a cost-effective option for budget-conscious boat owners.

4. **Compatibility with Older Engines** If you have a 1980s-era Mercury outboard (such as a 4.3L V8 or other models from that era), this lower unit is likely a direct fit, reducing the need for modifications.

5. **Potential for Rebuilding** Since the unit is common, finding a mechanic experienced with Mercury lower units is easier. A rebuild can extend its lifespan significantly, making it a viable long-term solution.

6. **Good Performance for Its Age** When in good condition, this lower unit provides reliable power transmission, especially for smaller to mid-sized boats. It handles typical recreational boating loads well.

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1. **Age-Related Wear and Tear** At nearly 40 years old, the unit may have accumulated internal wear, such as worn bearings, seals, or gears. Without a thorough inspection or service history, hidden issues could arise.

2. **Potential for Rust and Corrosion** If the unit was stored improperly (e.g., in saltwater without flushing or in a damp environment), rust can compromise internal components, leading to leaks or failure.

3. **Maintenance Requirements** Older lower units require regular maintenance, such as greasing the stern drive, checking fluid levels, and inspecting seals. Neglecting these steps can lead to costly repairs.

4. **Limited Warranty or No Warranty** Used units typically come without warranties. If purchased from a private seller, you bear full responsibility for any defects. Even from a dealer, warranties may be minimal or nonexistent.

5. **Compatibility with Modern Boats** If you re using this unit in a newer boat or with updated electronics (e.g., shift linkage, throttle controls), compatibility issues might arise, requiring additional modifications or adapters.

6. **Risk of Hidden Damage** Without a professional inspection, issues like cracked cases, seized gears, or contaminated oil may not be immediately obvious. A thorough test run or rebuild is advisable before installation.

7. **Environmental and Safety Concerns** Older units may not meet modern environmental standards (e.g., emissions or fuel efficiency). Additionally, if the unit has been poorly maintained, it could pose safety risks (e.g., oil leaks, gear failure).

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The Mercury 1667-9011J (1989 HP lower unit) is a practical and cost-effective choice for owners of compatible older Mercury outboards, provided it is in good condition or can be reliably rebuilt. Its widespread availability of parts and proven durability make it a solid option for those on a budget or working with classic boats. However, the risks of hidden damage, corrosion, and the need for regular maintenance cannot be overlooked. If you re willing to invest time in inspection, maintenance, or a rebuild, this unit can serve you well for years. For those seeking a hassle-free solution, a newer or refurbished unit might be preferable despite the higher cost.

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1. **Inspect Thoroughly Before Purchase** If buying used, have a marine mechanic inspect the unit for signs of wear, leaks, or internal damage. Request a service history if possible.

2. **Consider a Rebuild** If the unit is structurally sound but worn, a professional rebuild (including new seals, bearings, and gaskets) can extend its life significantly. This is often more cost-effective than buying new.

3. **Budget for Maintenance** Allocate funds for regular maintenance, such as greasing the stern drive, checking fluid levels, and replacing worn parts as needed.

4. **Test Run the Unit** If possible, test the unit in the boat before finalizing the purchase to ensure it operates smoothly under load.

5. **Evaluate Long-Term Viability** If you plan to keep the boat for many years, weigh whether the unit s age aligns with your maintenance capacity. For high-use boats, a newer or more modern lower unit may be worth the investment.

6. **Purchase from a Reputable Source** Buy from a trusted dealer, auction house with return policies, or a seller who offers warranties or guarantees. Avoid units with unclear histories or obvious signs of neglect.

**Final Verdict:** The Mercury 1667-9011J is a viable option for the right buyer one who prioritizes cost savings, has access to maintenance resources, and is prepared to address potential issues. For those seeking convenience or long-term peace of mind, a newer or refurbished unit may be the better choice.

Details:

Drive shaft length is 22.5 inch long from top of lower unit housing. Gears all work, recommend resealing, or at least pressure testing before use. Standard rotation, fresh water lower unit. Oil that was drained had a small amount of discoloration.

part #: 16679011j prices

• $545.00-$875.00

specifications ouboaen:

• for makes: Mercury
• for years: 1989
• mpn: 1667-9011j
• part type: Hp Unit

general ouboaen:

• Boat Parts > Outboard Engines Components > Complete Outboard Lower Units
• condition: Used

shipping ouboaen:

• class: Standard
• cost: $105.09
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• type: Calculated
• transit: 3-8 Days

offer ouboaen:

• quantity: 1
• availability: In Stock
• sold: 0
• started: April 15, 2026
• options: Ship-to-home

returns ouboaen:

• policy: No Returns

payments ouboaen:

• other
• wallet: Paypal
• credit card: Visa

seller ouboaen:

• rating: 100.0%
• # reviews: 814
• city: Mason, Wisconsin

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