1. Boat Outboard Engines To Buy
  2. sku: 23814252569475633
  3. MADHORNETS P003-A016

MADHORNETS P003-A016 Water Pump Impeller Kit 4/4.5/7.5/9.8 47-89981Q1

fits model: Mariner. make: Mercury.

47-89981q1 Madhornets P003-a016 Water Pump Impeller Kit Fit For Mercury Mariner 4/4.5/7.5/9.8 Hp -

( Brand: Madhornets ), ( Manufacturer Part Number: P003-A016 ), ( Part Type: Hp Pump Impeller )

Review MADHORNETS Water Pump Impeller Kit Fit Mercury 4/4.5/7.5/9.8 Hp fits MARINER

The **MadHornets P003-A016 Water Pump Impeller Kit** is a meticulously engineered replacement solution designed specifically for Mercury Mariner outboard motors spanning the 4.0 HP through 9.8 HP models manufactured between the late 1970s and early 1990s, corresponding to the OEM part number **47-89981Q1**. This high-performance impeller kit is crafted to restore optimal cooling efficiency, prevent overheating, and extend the lifespan of your engine by ensuring seamless water flow through the cooling system. Engineered from durable, corrosion-resistant materials, the impeller blades are precision-molded to match the original design, guaranteeing a perfect fit and maximizing water displacement without compromising engine performance. The kit includes a complete set of impeller components, including the impeller itself, a gasket, and often a mounting ring or adapter, all of which are designed to withstand the demanding conditions of marine environments, from saltwater corrosion to the abrasive effects of debris. Whether you re preparing for a season of heavy-duty fishing, leisure boating, or high-speed cruising, this impeller kit ensures that your Mercury Mariner operates at peak efficiency, reducing the risk of costly repairs due to overheating or cooling system failures. Ideal for both DIY enthusiasts and professional mechanics, the MadHornets P003-A016 is a straightforward upgrade that delivers reliable performance and long-term reliability, making it an essential addition to any maintenance routine for these classic outboard engines.

### Pros and Cons of buying a MadHornets P003-A016 Water Pump Impeller Kit for Mercury Mariner 4/4.5/7.5/9.8 HP (47-89981Q1)

#### **Pros:**

1. **Compatibility** This kit is specifically designed for Mercury Mariner outboard motors in the 4, 4.5, 7.5, and 9.8 HP range (models from 1989 and newer). The part number (47-89981Q1) ensures a direct fit, reducing the risk of mismatches.

2. **Performance Improvement** A worn or damaged impeller can reduce cooling efficiency, leading to overheating. Replacing it with a new, high-quality impeller (like the MadHornets P003-A016) can restore proper water flow, improving engine cooling and longevity.

3. **Durability and Material Quality** MadHornets is known for producing durable marine parts, often made from corrosion-resistant materials. This impeller should withstand prolonged use in saltwater and freshwater environments better than OEM replacements that may degrade over time.

4. **Ease of Installation** The kit is designed for straightforward replacement, requiring basic tools. Many users report that the process takes less than an hour, especially if the motor is already out of the water.

5. **Cost-Effective Solution** Compared to full water pump replacements, an impeller kit is significantly cheaper. This makes it an attractive option for owners who suspect impeller wear rather than a complete pump failure.

6. **Preventative Maintenance** Regularly replacing the impeller as part of routine maintenance can prevent unexpected breakdowns, especially in high-use or older engines where wear is more likely.

7. **Aftermarket Trust** MadHornets is a reputable brand in the marine aftermarket, with positive reviews for reliability and customer support. This adds confidence in the product s performance compared to generic or unknown brands.

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#### **Cons:**

1. **Aftermarket vs. OEM Concerns** Some purists or dealerships may prefer genuine Mercury-Mariner parts, arguing that aftermarket components could void warranties or not match the original specifications exactly. However, this kit is widely accepted as a high-quality alternative.

2. **Potential Overkill for Minor Issues** If the impeller is only slightly worn, some owners might opt for a cheaper OEM replacement instead. However, the MadHornets kit is still a cost-effective upgrade even in such cases.

3. **Installation Skill Required** While the installation is relatively simple, inexperienced DIYers might struggle with removing the old impeller or ensuring the new one is seated correctly. Improper installation could lead to leaks or reduced performance.

4. **Limited Lifespan** Like all impellers, this one will eventually wear out, especially in rough conditions. It s not a permanent fix but rather an intermediate solution until the next replacement is needed.

5. **Availability of OEM Alternatives** Some Mercury-Mariner dealerships or parts suppliers may carry the exact OEM impeller (e.g., 47-89981Q1) at a slightly higher price. Buyers should compare costs to ensure they re getting the best deal.

6. **Risk of Counterfeit Products** When purchasing from third-party sellers (e.g., Amazon, eBay), there s a chance of receiving counterfeit or low-quality knockoffs. Buying directly from MadHornets official website or authorized dealers minimizes this risk.

7. **No Included Tools** The kit does not come with specialized tools (e.g., impeller puller or seal installer), which some buyers may need to purchase separately if they don t already own them.

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### **Conclusion:**

The MadHornets P003-A016 water pump impeller kit is a **strong aftermarket alternative** for Mercury Mariner 4/4.5/7.5/9.8 HP outboards, offering better durability, performance, and cost-effectiveness compared to OEM parts. It s an excellent choice for owners who prioritize reliability and ease of installation. However, those who prefer sticking strictly to OEM parts or lack confidence in DIY repairs might opt for the genuine Mercury-Mariner impeller instead.

For most users, the **pros outweigh the cons**, making this kit a **highly recommended upgrade** for improving cooling efficiency and extending engine life.

### **Recommendation:**

- **Buy from an authorized MadHornets dealer or their official website** to avoid counterfeit products.

- **Follow the installation instructions carefully** to ensure proper sealing and alignment.

- **Consider pairing this with a water pump flush** if the system has been neglected for a long time.

- **Check for any ongoing promotions or bundle deals** that might include tools or additional marine maintenance items.

If you re confident in your mechanical skills and want a reliable, long-lasting impeller, this kit is an excellent investment.

Details:

4.5HP SRL#: 531. 1x Water Pump kit Impeller, Key, Wear plate, Sleeve, and O-rings. 90-365 Day Coverage varies by product - see listing details. Claim Process.

Important Notes. Required: Proof of purchase clear defect photos/video. We respond within 48h with solution. Item shows signs of use/wear.

WARRANTY Coverage. ULTRA-FAST SHIPPING Because you should't wait. Return doesn't match the original product condition missing/damaged.

specifications ouboaen:

  • for models: Mariner
  • for makes: Mercury
  • brand: Madhornets
  • mpn: P003-a016
  • part type: Hp Pump Impeller

offer ouboaen:

  • availability: In Stock
  • best offers: True
  • options: Ship-to-home
  • sold: 0
  • started: May 8, 2026

shipping ouboaen:

  • type: Fixed
  • transit: 8-20 Days
  • class: Economy
  • cost: $0.00
  • service: Economy

seller ouboaen:

  • city: Los Angeles, California
  • rating: 99.3%
  • # reviews: 90398

payments ouboaen:

  • wallet: Paypal
  • other
  • credit card: Mastercard

returns ouboaen:

  • paid by: Seller
  • policy: Returns Accepted
  • time: 60 Days

general ouboaen:

  • condition: New
  • Boat Parts > Outboard Engines Components > Other
for models: mariner, for makes: mercury, part type: hp pump impeller,
category: boat parts > outboard engines components, sku: 23814252569475633,
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