MERCURY STUD-57935 Tab Gearcase Stud 822777-2 1643-9539T 19539T8 40HP

( Manufacturer Part Number: STUD-57935 )

Review MERCURY Stud 57935 Tab Gearcase 40hp fits MARINER

The **Mercury Stud-57935** is a precision-engineered, high-quality replacement part designed specifically for the **Mariner 40HP (1643-9539T/19539T8) outboard motor**, ensuring optimal performance and longevity for marine applications. This **stud** is a critical component of the gearcase assembly, playing a vital role in maintaining structural integrity and alignment within the engine s drivetrain. Crafted from durable, corrosion-resistant materials, the **57935 stud** is engineered to withstand the demanding conditions of saltwater environments, extreme temperatures, and constant mechanical stress, making it an ideal long-term solution for boaters who demand reliability. Its precise dimensions and threading carefully calibrated to match the original equipment manufacturer (OEM) specifications guarantee a seamless fit, preventing leaks, misalignment, or premature wear in the gearcase housing. Whether used for routine maintenance, repairs, or upgrades, this stud ensures that the **Mariner 40HP** operates with the same efficiency and power as intended by Mercury Marine, reinforcing the motor s durability and performance on the water. For added convenience, it is often paired with complementary components like the **Tab 822777-2**, which may be required for proper installation and sealing, further enhancing the gearcase s functionality and protection against water ingress. Investing in this genuine Mercury part guarantees compatibility, performance, and peace of mind for marine enthusiasts and professionals alike.

### **Pros and Cons of buying a Mercury Stud-57935 (Tab 822777-2) for the 19539T/19539T8 Gears Case (Mariner 40HP)**

1. **Compatibility** The Stud-57935 is a direct replacement part for the 19539T/19539T8 gearcase in Mercury Mariner 40HP outboard motors. This ensures a proper fit without modification, reducing the risk of installation errors.

2. **Reliability** Mercury Marine is a well-known manufacturer with a reputation for durable marine components. A genuine or high-quality aftermarket stud is less likely to fail prematurely compared to inferior or counterfeit parts.

3. **Prevents Gearcase Damage** The gearcase is a critical component that houses the internal gears and bearings. A failing or loose stud can lead to misalignment, excessive wear, or catastrophic failure. Replacing a worn or damaged stud prevents further damage to the gearcase and other internal parts.

4. **Ease of Installation** Studs are relatively straightforward to replace, requiring only basic tools (socket wrench, torque wrench, and possibly a stud puller if the old stud is seized). No special expertise is needed, making it a DIY-friendly repair.

5. **Cost-Effective Repair** Replacing a single stud is significantly cheaper than overhauling or replacing the entire gearcase or outboard motor. The price of **$1643-9539T (or similar)** is reasonable for a critical replacement part, especially when compared to labor-intensive repairs.

6. **Extends Motor Lifespan** Ensuring all fasteners are in good condition helps maintain the structural integrity of the gearcase, reducing the risk of leaks, misalignment, or internal damage that could shorten the motor s lifespan.

7. **Warranty Considerations** If the motor is still under warranty, using an OEM or approved replacement part (like the Stud-57935) ensures compliance with warranty terms, preventing voiding of coverage due to improper repairs.

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1. **Potential for Counterfeit Parts** If purchasing from an unverified seller, there is a risk of receiving a counterfeit or substandard stud. Counterfeit parts may fail prematurely, leading to further damage or motor downtime. Always buy from authorized dealers or reputable suppliers.

2. **Torque Specifications Must Be Followed** Over-tightening or under-tightening the stud can cause stripping, warping, or loosening over time. Improper torque can lead to leaks or misalignment, negating the purpose of the replacement.

3. **Accessibility Challenges** The gearcase is located internally in the outboard motor, and removing it may require disassembling parts of the motor. This can be time-consuming, especially for inexperienced DIYers, and may require specialized tools (e.g., gearcase removal tool).

4. **Risk of Cross-Threading** If the existing threads in the gearcase are damaged or stripped, the new stud may not thread properly, leading to a loose or improper fit. In such cases, the gearcase may need to be replaced entirely.

5. **Limited Availability of Aftermarket Alternatives** While the Stud-57935 is a common part, availability may vary depending on the region or supplier. In some cases, ordering may take longer than expected, delaying repairs.

6. **Potential for Additional Wear** If the gearcase or surrounding components (e.g., bearings, seals) are already worn, replacing just the stud may not fully resolve the issue. A thorough inspection of the gearcase is recommended before installation.

7. **Labor Costs if Professional Help Is Needed** While the part itself is affordable, if the repair requires professional assistance (e.g., gearcase removal/installation), labor costs can add up, making the overall repair more expensive.

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Replacing the **Mercury Stud-57935 (Tab 822777-2)** in the **19539T/19539T8 gearcase** of a Mariner 40HP outboard is a **practical and cost-effective solution** for preventing gearcase failure. The benefits of improved reliability, extended motor lifespan, and compatibility outweigh the minor challenges, provided the part is genuine and installed correctly.

The **main risks** stem from purchasing counterfeit parts, improper installation, or overlooking other underlying issues in the gearcase. However, these risks can be mitigated by:

- Buying from an **authorized Mercury dealer or trusted supplier**.

- Following **torque specifications** precisely.

- Inspecting the **gearcase and surrounding components** before installation.

- Considering **professional help** if the repair is complex.

For most boat owners, this is a **recommended repair** to avoid costly motor failure. If the gearcase shows signs of significant wear (e.g., cracks, excessive play, or damaged threads), a **full gearcase overhaul or replacement** may be necessary, but the Stud-57935 is an excellent starting point for a routine maintenance task.

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- The part is sourced from a **reputable dealer**.

- You are comfortable with **basic motor disassembly and torque specifications**.

- The gearcase appears to be in **otherwise good condition**.

- The gearcase shows **visible damage or excessive wear** a professional inspection may be needed.

- You are unsure about **installation** consult a marine mechanic to avoid mistakes.

- The motor is **under warranty** verify that the repair complies with warranty terms.

This replacement is a **wise investment** in preventing a much more expensive failure down the line.

Details:

All parts on the ad, are mechanically in good working condition unless its described, clearly seen or noted pictures. Then let me know what your looking for. Cant Guarantee if piston rings seals or gaskets are in working condition, Unless its noted otherwise the pictures. Hope that helps, many parts from this motor MIGHT also work on model's below.

All parts are dirty and need to be cleaned. Free Priority 2-3day. Free FedEx ground up to 7day. If I have more then one quantity available on the ad,the parts will cosmetically color,water stain,dirt,scratches,dings.

SHIPPING: All shipping 48 state domestic is free. Taken apart Motor Make model serial Year HP: Mercury 40hp 20 shaft standard outboard motor oc2951. Etc differ from each other, but mechanically they will work.I send the best looking first.

part #: stud57935 prices

• $39.00-$85.00

specifications ouboaen:

• for models: Mariner
• for makes: Mercury
• mpn: Stud-57935

shipping ouboaen:

• class: Standard
• type: Fixed
• cost: $0.00
• transit: 3-7 Days
• service: Standard

seller ouboaen:

• city: Spokane, Washington
• # reviews: 14478
• rating: 100.0%

returns ouboaen:

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

general ouboaen:

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

offer ouboaen:

• quantity: 1
• availability: In Stock
• options: Ship-to-home
• best offers: True
• started: June 2, 2026
• sold: 0

payments ouboaen:

• other
• credit card: Mastercard
• wallet: Google-pay

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