Water Pump Impeller Repair Kit – Fits Mercury/Mariner 30-125 HP (Replaces 46-8M0113799, 46-43024A7)
Water Pump Impeller Repair Kit – Fits Mercury/Mariner 30-125 HP (Replaces 46-8M0113799, 46-43024A7) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Impeller Repair Kit – Fits Mercury/Mariner 30-125 HP (Re...
Water Pump Impeller Repair Kit – Fits Mercury/Mariner 30-125 HP (Replaces 46-8M0113799, 46-43024A7) is backordered and will ship as soon as it is back in stock.
Product Details
This is a Water Pump Impeller Repair Kit – Fits Mercury/Mariner 30-125 HP, designed for a wide range of 2-stroke and 4-stroke outboard engines from the 1990s through the 2020s. The kit contains all necessary components to restore the engine's cooling system to optimal performance, preventing overheating and ensuring reliability.
It serves as a direct interchange for Mercury part numbers 46-8M0113799 and the superseded 46-43024A7, as well as Sierra aftermarket part 18-3688.
- Engineered for direct replacement installation.
- Includes key components for a complete water pump service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 46-8M0113799 | Current OEM Part Number |
| Mercury | 46-43024A7 | Superseded by 46-8M0113799 |
| Sierra | 18-3688 | Aftermarket Interchange |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury and Mariner outboard engines, check your serial number range where applicable to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 3-Cylinder Bigfoot | 30 | 4-Stroke | Up to 1B226999 | 46-8M0113799 | Superseded 46-43024A7 |
| Mercury | 4-Cylinder | 40, 45, 50, 60 | 4-Stroke | Various | 46-8M0113799 | Superseded 46-43024A7 |
| Mercury | 3-Cylinder | 55, 60, 65 | 2-Stroke | 0G760300 & Up | 46-8M0113799 | Superseded 46-43024A7 |
| Mercury | 3-Cylinder | 65 Jet | 2-Stroke | 0G760300-1B000001 & Up | 46-8M0113799 | Superseded 46-43024A7 |
| Mercury | 3-Cylinder | 75 | 2-Stroke | 0G760300 & Up | 46-8M0113799 | Superseded 46-43024A7 |
| Mercury | 3-Cylinder (1.5L) | 75 | 2-Stroke (OptiMax) | 0T980000-2B112577 | 46-8M0113799 | Superseded 46-43024A7 |
| Mercury | 4-Stroke | 75, 80, 90, 100, 115 | 4-Stroke | Various | 46-8M0113799 | Superseded 46-43024A7 |
| Mercury | 3-Cylinder | 90 | 2-Stroke | 0G760300 & Up | 46-8M0113799 | Superseded 46-43024A7 |
| Mercury | 3-Cylinder (1.5L) | 90, 115, 125 | 2-Stroke (OptiMax) | Various | 46-8M0113799 | Superseded 46-43024A7 |
| Mercury | 4-Cylinder | 100, 115, 125 | 2-Stroke | 0G760300–0T979999 | 46-8M0113799 | Superseded 46-43024A7 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct replacement
- Quality
- High-quality aftermarket component
- Warranty
- Varies by manufacturer
What’s in the Box
- Impeller (Replaces 47-43024T)
- Gaskets
- O-Rings
- Mounting Hardware
- Key
Installation Notes
- Disconnect the battery and shift linkage before beginning work.
- Remove the bolts securing the lower unit (gearcase) and carefully lower it from the midsection.
- Unbolt and remove the old water pump housing, gaskets, and impeller. Note the orientation of the impeller vanes.
- Thoroughly clean the mating surfaces on the gearcase and driveshaft.
- Install the new key, gaskets, and impeller (with vanes oriented correctly) from the kit.
- Reassemble the housing and torque bolts to the manufacturer's specified value.
- Carefully reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube align correctly.
- Reconnect the shift linkage and battery terminals.
- Before launching, test the engine using a flush attachment ("muffs") to verify water is pumping correctly.
Troubleshooting & FAQ
How do I know if this kit fits my engine?
This kit is designed for a broad range of Mercury/Mariner 30-125 HP outboards. The most reliable method is to check your model, year, and serial number against the compatibility table. If your engine is listed, the kit is a confirmed fit.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or non-existent "telltale" water stream, engine overheating alarms, and reduced engine performance. Visible signs on the old impeller include cracked, brittle, or missing vanes.
How often should the impeller be replaced?
As a preventative maintenance item, most manufacturers recommend replacing the water pump impeller every 1-2 years or every 100-200 hours of use, whichever comes first. This interval can be shorter if you operate in saltwater or sandy/silty conditions.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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