MERCURY 35-23342A1 Antique Outboard Motor Gas Tank Filter KG7 KF7 KH7 Nut 10HP

( Manufacturer Part Number: 35-23342A1 ), ( Part Type: Motor Tank Filter ), ( Country Of Origin: United States )

Review MERCURY Antique Outboard Motor Kg7 Kf7 Kh7 Gas Tank Filter Nut 10hp fits 1950–1952

The **Mercury 35-23342A1 Antique Outboard Motor** from the early 1950s specifically the **KG7, KF7, or KH7 series** represents a rare and highly sought-after piece of boating history, embodying the ingenuity and craftsmanship of an era when outboard motors were still evolving into the reliable workhorses they are today. This **10HP** model, produced between **1950 and 1952**, is a classic example of Mercury s early innovations, featuring a compact yet robust design that was tailored for small boats, fishing vessels, and recreational craft of the time. The **gas tank filter nut (part #35-23342A1)** is a critical component of this motor, ensuring clean fuel delivery to the carburetor a vital element in maintaining optimal performance and preventing engine wear. Crafted with precision, the filter nut is designed to securely fasten the fuel filter assembly, which plays a crucial role in filtering out impurities that could clog the carburetor or damage internal engine parts. The **KG7, KF7, and KH7 variants** of this motor share a similar mechanical foundation but may differ slightly in minor details such as carburetor adjustments, ignition timing, or cooling system configurations, reflecting Mercury s gradual refinements during this transitional period. This motor operates on a **two-stroke cycle**, a hallmark of early outboard design, where fuel and oil are mixed before combustion, providing a simple yet effective power delivery system. The **1950s-era construction** of this motor includes a **cast aluminum cowling**, a durable yet lightweight material that helped reduce overall weight while maintaining structural integrity. The **ignition system** likely features a **magneto-based setup**, a common and reliable method for spark generation in outboards of this era, though some variations may incorporate early electric ignition components. The **cooling system** relies on a **water-cooled cylinder head**, with water drawn in through the lower unit and expelled through the cowling s vents, a design that was both efficient and practical for its time. For collectors, restorers, and enthusiasts, this motor offers a tangible connection to the golden age of boating, when outboards were still being perfected and the industry was expanding rapidly. Whether used in a **vintage fishing boat, a classic runabout, or as a centerpiece in a mechanical restoration project**, the **Mercury 35-23342A1** stands as a testament to mechanical simplicity and durability. Proper maintenance, including regular checks on the **gas tank filter nut and fuel system**, is essential to keeping this motor running smoothly, as corrosion and wear can affect performance over time. With its **historic significance, functional reliability, and nostalgic appeal**, this **10HP Mercury outboard** is not just a piece of machinery it s a relic of an era when innovation and adventure on the water were still in their prime.

### **Pros and Cons of Buying a Mercury 35-23342A1 (KG7/KF7/KH7) 10HP Antique Outboard Motor (1950 1952)**

#### **Pros**

1. **Historical and Collectible Value**

- These early Mercury outboards are highly sought after by collectors due to their rarity and historical significance. The KG7, KF7, and KH7 models from the early 1950s are among the first mass-produced Mercury engines, making them valuable to enthusiasts.

- Original, well-preserved examples can appreciate in value over time, especially if they come with documentation, original parts, or a proven service history.

2. **Nostalgia and Classic Appeal**

- Owning a piece of boating history provides a unique connection to the early days of outboard motors. The mechanical simplicity and craftsmanship of these engines appeal to those who appreciate vintage technology.

- They can be used for restoration projects, museum displays, or as centerpieces for classic boat shows.

3. **Potential for Restoration and Customization**

- Restoring an early Mercury engine can be a rewarding hobby, allowing for deep mechanical knowledge and hands-on work. Many parts are still available through specialty suppliers or can be reproduced by machinists.

- Some owners modify these engines for aesthetic purposes (e.g., chrome finishes, custom paint jobs) or even experiment with modern upgrades (e.g., fuel injection conversions, though this is rare and often discouraged for authenticity).

4. **Low Operating Costs (If Running)**

- Gasoline and basic maintenance costs are minimal compared to modern outboards. If the engine is in good condition, running it occasionally for maintenance or short trips can be inexpensive.

- The simplicity of the design means fewer electronic components to fail, though wear on internal parts (pistons, bearings, etc.) is inevitable over time.

5. **Community and Networking Opportunities**

- Joining classic outboard or boating forums (e.g., Mercury Outboard Forum, Antique Boat Forum) connects you with others who share your interest. This can provide support, parts swaps, and restoration advice.

- Local clubs or meetups for vintage boat owners often feature these engines, offering social and educational benefits.

---

#### **Cons**

1. **High Maintenance and Reliability Issues**

- These engines are **not built for modern use**. The KG7/KF7/KH7 models were designed for short-term, occasional use and lack many modern reliability features (e.g., corrosion-resistant materials, sealed bearings, or advanced cooling systems).

- **Worn or seized pistons and cylinders** (due to leaded gasoline and lack of modern lubricants).

- **Rust and corrosion** in the water intake, exhaust, and lower unit (especially if stored improperly).

- **Leaking gaskets and seals** (original rubber components degrade over decades).

- **Fuel system issues** (carburetor clogging, fuel line deterioration, or vapor lock in heat).

- **Transmission wear** (early outboards often had simple gear systems prone to slipping or grinding).

2. **Limited Availability of Parts and Suppliers**

- While some parts are still available (e.g., from **Mercury Marine s archive**, **eBay sellers**, or **specialty restoration shops**), many components (e.g., original carburetors, timing chains, or lower-unit seals) are obsolete or require machining.

- Rebuilding the engine may require sourcing parts from multiple suppliers or even fabricating custom pieces, which can be time-consuming and costly.

3. **Fuel and Lubricant Compatibility**

- These engines were designed for **leaded gasoline**, which is no longer sold. Modern unleaded fuel can cause **carbon buildup, valve sticking, and piston ring seizure** if used long-term. Some owners blend unleaded with a small amount of leaded fuel (e.g., 10% leaded) or use **ethyl-free alternatives** (though these are not ideal).

- Original lubricants (e.g., straight mineral oil) may not be available, and modern synthetic oils can sometimes cause compatibility issues (e.g., seal swelling).

4. **Performance Limitations**

- The 10HP rating is **notoriously optimistic** for these engines. In reality, they rarely produce more than **5 7HP** reliably, especially after decades of use. They are **not suitable for serious boating** (e.g., towing, long trips, or rough water).

- Cooling is inefficient by modern standards. The engines overheat easily in warm weather or if the water intake is clogged, leading to potential damage.

5. **Storage and Preservation Challenges**

- Storing these engines requires **dry, rust-free conditions**. If left in water or humid environments, corrosion will accelerate, making restoration nearly impossible.

- Even when stored properly, **o-rings and seals dry out** over time, requiring periodic lubrication with **boating grease or silicone spray** to prevent cracking.

6. **Legal and Insurance Considerations**

- Some **marinas or lakes** have restrictions on vintage outboards, particularly if they lack modern safety features (e.g., no kill switch, minimal corrosion protection).

- **Insurance may not cover** classic outboards, or premiums could be high due to their value and restoration risks. Always check with your insurer before using one on the water.

7. **Time and Skill Intensive**

- Restoring one of these engines is a **major project** that requires mechanical aptitude, patience, and access to tools (e.g., a lathe for machining parts, a carburetor bench, or a compression tester).

- If you lack experience with small engines, the learning curve can be steep, and mistakes (e.g., improperly fitting a piston) can lead to catastrophic failure.

8. **Resale Value Uncertainty**

- While some well-preserved examples hold value, most vintage outboards depreciate quickly after purchase. Unless you are a serious collector, reselling one later may not recoup your investment in restoration.

- The market for these engines is **niche**, and demand fluctuates based on trends in classic boating.

---

### **Conclusion and Recommendation**

#### **Who Should Buy One?**

- **Collectors and enthusiasts** who prioritize the historical and aesthetic value over practical use.

- **Mechanically skilled individuals** willing to invest significant time and effort into restoration.

- **Boat owners with a small, stationary display boat** (e.g., a docked classic canoe or runabout) where the engine is used only for occasional runs or as a decorative feature.

- **Those who enjoy hobby projects** and are prepared for the challenges of maintaining a 70-year-old machine.

#### **Who Should Avoid Buying One?**

- **Casual boaters** who need a reliable, low-maintenance engine for regular use.

- **People without mechanical experience** or access to tools for restoration.

- **Those who cannot afford the time/money for repairs** (expect to spend **$1,000 $5,000 ** on a full restoration, depending on condition).

- **Anyone who plans to use it frequently** these engines are not built for modern demands and will likely fail or require constant attention.

#### **Final Recommendation**

If you are **passionate about vintage machinery** and willing to commit to the challenges of restoration, a Mercury KG7/KF7/KH7 can be a fascinating and rewarding project. However, **do not buy one expecting it to be a functional, reliable engine** it should be treated as a **collectible or a restoration challenge**, not a primary power source.

1. **Inspect the engine thoroughly** for rust, seized parts, or internal damage. A **compression test** and **run-in test** (if possible) are critical.

2. **Verify the model and serial number** to confirm authenticity and rarity.

3. **Budget for restoration** factor in parts, labor, and potential unexpected issues.

4. **Join classic outboard forums** to connect with experts who can advise on specific models.

5. **Consider a "test run"** if possible, or buy from a seller who offers a **money-back guarantee** or **restoration warranty**.

For most people, a **modern 2 5HP outboard** (e.g., Johnson, Evinrude, or Yamaha) would be a far more practical and reliable choice. But if you love the era and are prepared for the work, a Mercury KG7/KF7/KH7 can be a unique and fulfilling addition to your collection.

Details:

You won't soon find a nicer one. Look at this Mercury antique outboard motor fuel filter assembly. 1950 to 1952 10hp. This is the original filter.

Nobody tried to take the nut off with a chisel. This part is amazingly hard to find in good condition. Fits KF7, KG7, KH7, MK7 and possible others. Mounting nut has only small hammer and pliers marks.

Threads are not stripped.

part #: 3523342a1 prices

• $19.95-$249.00

specifications ouboaen:

• for makes: Mercury
• for years: 1950-1952
• mpn: 35-23342a1
• part type: Motor Tank Filter
• country of origin: United States

seller ouboaen:

• city: Altadena, California
• # reviews: 6440
• rating: 100.0%

shipping ouboaen:

• class: Standard
• type: Calculated
• service: USPS Ground Advantage
• cost: $8.10
• carrier: USPS
• transit: 4-9 Days

general ouboaen:

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

offer ouboaen:

• started: April 11, 2026
• sold: 0
• availability: In Stock
• quantity: 1
• options: Ship-to-home

returns ouboaen:

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

payments ouboaen:

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

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