1. Boat Outboard Engines To Buy
  2. sku: 22856383728402881
  3. MERCURY 39-801799

MERCURY 39-801799 Piston Ring Set Outboard Engine

fits make: Mercury.

39-801799 Mercury Piston Ring Set Genuine Oem Outboard Engine New

( Manufacturer Part Number: 39-801799 ), ( Part Type: Ring Piston Engine )

Review MERCURY Piston Ring Set Genuine Oem Outboard Engine New

The **Mercury 39-801799 Piston Ring Set** is a precision-engineered component designed exclusively for high-performance outboard motors, ensuring optimal combustion efficiency, reduced wear, and extended engine life. Crafted from high-grade, heat-resistant materials, this piston ring set is meticulously manufactured to meet Mercury s stringent quality standards, delivering reliable performance in demanding marine environments. The rings are engineered with a **compression ring** at the top to maintain proper cylinder pressure, preventing blow-by and maximizing fuel combustion, while the **oil control rings** below minimize oil consumption and reduce carbon buildup, keeping the engine running smoothly. Each ring is precision-ground and polished to an ultra-smooth finish, reducing friction and heat buildup for improved durability and fuel economy. Whether installed in a two-stroke or four-stroke outboard, this ring set is built to withstand the rigors of saltwater corrosion, high RPMs, and prolonged use, making it an essential upgrade for marine enthusiasts seeking peak engine performance. Ideal for both new builds and engine rebuilds, the **39-801799** ensures a tight, consistent seal, helping to restore lost compression and restore the engine to factory specifications. Backed by Mercury s reputation for innovation and reliability, this piston ring set is a must-have for anyone looking to optimize their outboard s power, efficiency, and longevity.

### **Pros and Cons of buying a Mercury 39-801799 Piston Ring Set for Outboard Engines**

#### **Pros:**

The Mercury 39-801799 piston ring set is a widely recognized and reliable component for outboard engines, particularly those in the 90 200 HP range. Here are the key advantages:

1. **Compatibility and Fit:** This ring set is specifically designed for Mercury outboards, ensuring a precise fit for engines like the 90, 115, 150, and 200 HP models (depending on the year and model). Properly fitted rings improve engine performance and longevity.

2. **Performance Improvement:** Worn or damaged piston rings can lead to oil consumption, loss of compression, and reduced power. Replacing them with a new set restores engine efficiency, fuel economy, and power output.

3. **Prevents Major Engine Damage:** If rings are severely worn, they can allow coolant into the combustion chamber, causing catastrophic failure (e.g., seized pistons or head gasket leaks). Replacing them proactively avoids costly repairs.

4. **Extended Engine Life:** Fresh rings reduce friction and heat buildup, helping the engine run smoother and last longer, especially in high-performance or frequent-use applications.

5. **Easy Installation:** The design of this ring set is straightforward, making it accessible for DIYers with basic mechanical skills. Mercury provides installation guidelines to simplify the process.

6. **Cost-Effective Maintenance:** Compared to a full engine rebuild, replacing just the piston rings is a relatively inexpensive way to maintain engine health.

7. **Warranty and Support:** Mercury parts often come with warranties, and dealers or service centers can provide technical support if issues arise during installation.

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#### **Cons:** While the Mercury 39-801799 piston ring set is a solid choice, there are some potential drawbacks to consider:

1. **Installation Complexity:** Although manageable, replacing piston rings requires disassembling the engine, removing the cylinder head, and carefully measuring piston ring gaps. Mistakes in installation (e.g., incorrect gap or improper seating) can lead to performance issues or damage.

2. **Labor-Intensive Process:** For those without mechanical experience, this job may require professional help, adding to the total cost. DIYers must be patient and precise.

3. **Potential for Contamination:** If the engine is not thoroughly cleaned during the process, debris or old carbon buildup can interfere with the new rings, reducing their effectiveness.

4. **Mixed Reviews on Durability:** Some users report that while the rings improve initial performance, they may wear out faster than expected in high-mileage or heavily loaded engines. This can lead to needing replacements sooner than anticipated.

5. **Limited to Mercury Engines:** This part is not universal it will not fit non-Mercury outboards (e.g., Yamaha, Suzuki, or Evinrude) without compatibility checks. Always verify the exact model and year before purchasing.

6. **Risk of Over-Tightening:** Improperly torquing the cylinder head or piston rings can cause warping or leaks. Following Mercury s torque specifications is critical.

7. **Cost of Additional Parts:** Depending on the condition of the engine, you may need to replace other components (e.g., valves, seals, or gaskets) simultaneously, increasing the overall expense.

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### **Conclusion:**

The Mercury 39-801799 piston ring set is a high-quality, reliable upgrade for compatible Mercury outboard engines. It offers significant benefits in terms of performance, longevity, and preventative maintenance. However, the installation requires careful attention to detail, and DIYers should be prepared for a labor-intensive process. For those with mechanical experience or access to professional help, the pros outweigh the cons, making it a worthwhile investment. If the engine is heavily worn or the user lacks confidence in their skills, consulting a marine mechanic may be advisable to ensure proper installation and avoid further damage.

### **Recommendation:**

If you are maintaining a Mercury outboard engine (90 200 HP range) and experiencing symptoms like blue exhaust smoke, oil consumption, or loss of power, replacing the piston rings is a smart preventive measure. **Purchase the Mercury 39-801799 set if:**

- You confirm it matches your engine model and year.

- You are willing to invest time in proper installation (or hire a professional).

- You plan to address any accompanying wear (e.g., valves, seals) during the process.

**Avoid this purchase if:**

- You are unsure about the engine s compatibility or lack mechanical experience.

- The engine has severe internal damage (e.g., scored cylinders, bent rods) that would require a full rebuild.

- You are on a tight budget and cannot afford professional labor or additional parts.

For best results, pair this upgrade with regular engine maintenance, such as oil changes, fuel system cleaning, and cooling system checks. If in doubt, consult a Mercury-certified technician to assess whether this is the right solution for your engine s condition.

Details:

OEM Genuine Mercury Part. This ring set is designed for use in compatible Mercury outboard engines, helping maintain proper compression, sealing, and engine performance. Notes: Please verify this part number fits your specific Mercury engine before purchasing. This is an OEM Mercury Marine part that new out of original packaging and has never been used or installed.

Type: Piston Ring Set. Brand: Mercury Marine. Condition: New out of box no original packaging. Part Details: Number: 39-801799.

May show minor shelf wear from storage. Genuine Mercury 39-801799 piston ring set. Never used or installed.

part #: 39801799 price

  • $60.00

specifications ouboaen:

  • for makes: Mercury
  • mpn: 39-801799
  • part type: Ring Piston Engine

returns ouboaen:

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

offer ouboaen:

  • started: March 24, 2026
  • best offers: True
  • sold: 0
  • availability: In Stock
  • options: Ship-to-home

general ouboaen:

  • Boat Parts > Outboard Engines Components > Other
  • condition: New other see details

shipping ouboaen:

  • class: Standard
  • transit: 4-10 Days
  • service: USPS Ground Advantage
  • cost: $5.89
  • carrier: USPS
  • type: Calculated

seller ouboaen:

  • # reviews: 9
  • city: Metamora, Michigan
  • rating: 100.0%

payments ouboaen:

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for makes: mercury, part type: ring piston engine,
category: boat parts > outboard engines components, sku: 22856383728402881,
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1 offer $60.00 USD
  • New other (see details). Offer #1 priced at $60.00 + $6.37 shipping estimate = $66.37* total. May show minor shelf wear from storage. Type: Piston Ring Set.+$6.37 shipping

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