YAMAHA MERCURY MARINER 827124M Lower Unit Gearcase 15HP

( Brand: Yamaha Mercury Mariner ), ( Manufacturer Part Number: 827124M ), ( Part Type: Unit )

Review YAMAHA MERCURY MARINER 15hp Lower Unit Gearcase Assembly fits 1983

The **Yamaha Mercury 1983 15HP Lower Unit Gearcase (Part #827124M)** is a meticulously engineered component designed to deliver reliable performance and durability for classic Yamaha outboard motors, particularly those from the late 1970s and early 1980s era. This lower unit gearcase is a critical part of the propulsion system, housing the internal gears that transfer power from the motor s drive shaft to the propeller, ensuring smooth and efficient thrust while minimizing wear and tear. Crafted from high-quality marine-grade materials, including precision-machined aluminum alloys, this gearcase is built to withstand the demands of saltwater corrosion, constant vibration, and heavy loads, making it a sought-after replacement for aging or damaged original units. The design features a robust, oil-sealed housing that protects the internal components from water ingress while maintaining optimal lubrication for the gears and bearings, extending the lifespan of the entire lower unit assembly. Whether restoring a vintage Yamaha Mercury for recreational boating, fishing, or classic boat shows, this gearcase offers a perfect balance of performance and authenticity, ensuring that the motor operates with the same efficiency as it did when new. Its compatibility with a range of 15HP Yamaha outboards from the early 1980s makes it an ideal choice for enthusiasts looking to preserve the integrity of their vessel s original equipment while upgrading worn-out parts. With its timeless engineering and enduring reliability, this lower unit gearcase remains a cornerstone for those who appreciate the craftsmanship of a bygone era in marine propulsion.

### **Pros and Cons of buying a Yamaha Mercury Mariner 827124M (1983, 15HP Lower Unit/Gearcase)**

1. **Proven Reliability** Yamaha s Mercury engines from the early 1980s were well-built and durable, especially for their time. The 15HP outboard was a common and trusted model for small boats, making parts and maintenance knowledge widely available.

2. **Lower Unit/Gearcase Availability** The 827124M is a standard lower unit for many Yamaha 15HP outboards from that era. Finding replacement parts, seals, and bearings is relatively straightforward, though sourcing may require searching through marine salvage yards, eBay, or specialty suppliers.

3. **Simple Design** Early 1980s Yamaha outboards were mechanically straightforward compared to modern high-tech models. This means repairs can often be done with basic tools and mechanical knowledge, reducing reliance on specialists.

4. **Potential for Restoration** If the lower unit is in decent condition, restoring it could be a cost-effective way to revive an older boat. Many enthusiasts enjoy working on classic marine engines, and this unit could be a good project piece.

5. **Lower Cost** Since this is an older part, the initial purchase price will likely be significantly cheaper than a new or even lightly used lower unit from a modern outboard.

6. **Compatibility** The 15HP lower unit fits a variety of small boats, including dinghies, runabouts, and small fishing vessels. If you already have a compatible upper unit or engine, this could be a budget-friendly upgrade.

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1. **Age and Wear** At nearly 40 years old, the lower unit may show signs of wear, such as worn gears, corroded shafts, or degraded seals. Without a thorough inspection, you risk buying a part that will fail soon after installation.

2. **Limited Modern Support** Unlike newer Yamaha outboards, which have extensive warranties and dealer support, this part may not be covered by any guarantees. You ll need to rely on your own mechanical skills or a marine mechanic for repairs.

3. **Potential for Rust and Corrosion** Older marine parts, especially those stored improperly, can suffer from rust and corrosion. The gearcase may need cleaning, rust treatment, or even machining to ensure proper function.

4. **Seal and Bearing Degradation** Over time, the internal seals and bearings in the lower unit can dry out or fail. If these components are compromised, they may need replacement, adding to the cost of ownership.

5. **Compatibility Issues** While the part is likely to fit mechanically, you ll need to ensure it matches the shaft diameter, mounting holes, and electrical connections of your specific boat setup. A mismatch could require additional modifications.

6. **Environmental and Safety Concerns** Older marine parts may not meet modern environmental standards (e.g., lead-based paints, outdated lubricants). If you plan to use this in a saltwater environment, corrosion resistance will be a key concern.

7. **Resale Value** Unlike newer parts, this lower unit will have little to no resale value. If you decide to upgrade later, you may struggle to recoup your investment.

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Buying the **Yamaha Mercury Mariner 827124M (1983, 15HP lower unit/gearcase)** can be a **cost-effective solution** if you need a replacement for an older boat and are willing to invest time in inspection, maintenance, or restoration. It is a **practical choice for enthusiasts, DIYers, or those working on classic boats** where modern parts are unavailable or prohibitively expensive.

However, if you are looking for **long-term reliability, warranty coverage, or a hassle-free upgrade**, this part may not be the best option. The risks of **hidden damage, compatibility issues, or the need for additional repairs** could outweigh the benefits unless you are prepared to thoroughly inspect and service it before installation.

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- **If you are restoring a classic boat or need a budget-friendly lower unit for a small, low-use vessel**, this part could be a good fit **but only if you inspect it carefully** for rust, wear, and functionality. Consider testing it in water before full installation to ensure it operates smoothly.

- **If you are unsure about its condition**, have a marine mechanic inspect it before purchasing. If it requires significant work (e.g., gear replacement, shaft machining), weigh whether it s worth the effort versus buying a used or remanufactured lower unit from a reputable supplier.

- **For modern boats or high-use applications**, prioritize a **new or remanufactured lower unit** from Yamaha or a trusted marine parts dealer to ensure reliability and safety.

Ultimately, this part is best suited for **those with mechanical experience, patience, and a willingness to troubleshoot** not for those seeking a plug-and-play solution.

Details:

Good lower unit, pressure tested.

part #: 827124m price

• $500.00

specifications ouboaen:

• for makes: Yamaha
• for years: 1983
• brand: Yamaha Mercury Mariner
• mpn: 827124m
• part type: Unit

offer ouboaen:

• quantity: 1
• options: Ship-to-home
• started: February 21, 2026
• availability: In Stock
• best offers: True
• sold: 0

payments ouboaen:

• credit card: Visa
• other
• money order
• wallet: Google-pay

general ouboaen:

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

shipping ouboaen:

• class: Standard
• type: Calculated
• carrier: FedEx
• transit: 5-11 Days
• service: FedEx Ground / FedEx Home Delivery
• cost: $34.32

returns ouboaen:

• policy: No Returns

seller ouboaen:

• city: Orlando, Florida
• # reviews: 15
• rating: 100.0%

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