Water Pump Impeller Kit – Fits Mercury/Mariner 6-15 HP (Replaces 47-42038Q02, 18-3062)
Water Pump Impeller Kit – Fits Mercury/Mariner 6-15 HP (Replaces 47-42038Q02, 18-3062) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Impeller Kit – Fits Mercury/Mariner 6-15 HP (Replaces 47...
Product Details
This aftermarket Water Pump Impeller Kit – Fits Mercury/Mariner 6-15 HP (Replaces 47-42038Q02, 18-3062) is designed for a precise fit on a range of 2-stroke and 4-stroke outboard engines. It covers Mercury/Mariner models from 1986 and up, including 6-15 HP 2-strokes, 8-9.9 HP 4-strokes (up to 2004), and specific 15 HP 4-strokes (up to 2008). It also fits select 1998 Force 9.9-15 HP engines.
This kit serves as a direct interchange for Mercury part numbers 47-42038-2, 47-420381, and 47-42038Q02, as well as aftermarket references like Sierra 18-3062, GLM 89451, and Mallory 9-45309.
- Engineered as a direct OEM-equivalent replacement for straightforward installation.
- Features a durable 6-blade neoprene impeller with a chemically bonded nylon hub to prevent separation.
- Kit includes the impeller, drive key, and necessary housing gaskets for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 47-42038Q02 |
| Mercury | 47-42038-2 |
| Mercury | 47-420381 |
| Sierra | 18-3062 |
| GLM | 89451 |
| Mallory | 9-45309 / 9-45309-10 |
| CEF | 500318 |
Engine & Model Compatibility
Confirm your engine model, year, and serial number in the tables below. Proper fitment depends on matching these details precisely.
For Mercury/Mariner Outboards: Covers specific 2-stroke and 4-stroke models. Pay close attention to serial number ranges, as they are critical for identifying the correct part, especially for USA and Belgian (BEL) manufactured engines.
For Force Outboards: Fits specific 9.9 and 15 HP models from 1998 only.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury/Mariner | Standard | 6 | 2-Stroke | 1986–1993 | 47-42038Q02 | Serial: 0A197112-0T800749 (USA), 9461526 & Up (BEL) |
| Mercury/Mariner | Standard | 8 | 2-Stroke | 1986–1993 | 47-42038Q02 | Serial: 0A197112 & Up (USA), 9461526 & Up (BEL) |
| Mercury/Mariner | Standard | 9.9 | 2-Stroke | 1986–1998 | 47-42038Q02 | Serial: 0A197112 & Up (USA), 9461526 & Up (BEL) |
| Mercury/Mariner | XR10, SeaPro, Marathon | 10 | 2-Stroke | 1990–1998 | 47-42038Q02 | Serial: 0D038000 & Up (USA), 9596000 & Up (BEL) |
| Mercury/Mariner | Standard | 15 | 2-Stroke | 1988–1998 | 47-42038Q02 | Serial: 0B292414 & Up (USA), 9542620 & Up (BEL) |
| Mercury/Mariner | Sea Pro & Marathon | 15 | 2-Stroke | 1994–1998 | 47-42038Q02 | Serial: 0G044365 & Up (USA), 9927000 & Up (BEL) |
| Mercury/Mariner | Standard | 8 | 4-Stroke | 1995–2004 | 47-42038Q02 | Serial: 0G760300-0T178499 (USA), 0H017100-0H017349 (USA), 0P075166-0P325499 (BEL) |
| Mercury/Mariner | Standard | 9.9 | 4-Stroke | 1995–2004 | 47-42038Q02 | Serial: 0H000058-0H016909 (USA), 0G760300-0T979999 (USA), 0P075166-0P325499 (BEL) |
| Mercury/Mariner | Standard (323cc) | 15 | 4-Stroke | 1998–2008 | 47-42038Q02 | Serial: 0G590000 & Up (USA), 9973100 & Up (BEL) |
| Force | Standard | 9.9/15 | 2-Stroke | 1998 | 47-42038Q02 |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Material
- Neoprene rubber with hardened nylon hub
- Blade Count
- 6 blades
- Dimensions
- 58.8 mm diameter × 11.7-11.9 mm height × 12.6-13 mm center hole
- Installation
- Direct OEM replacement
- Weight
- 0.35 oz (9.9 g)
- Other Technical Attributes
- Center insert bonded to vanes to resist tearing
What’s in the Box
Package contents may vary slightly between aftermarket brands but typically include:
- 1 x Water Pump Impeller (Replaces 47-42038-2)
- 1-2 x Impeller Gaskets (Replaces 27-19202, 27-19204-3)
- 1 x Impeller Drive Key
Installation Notes
Follow your engine’s service manual for detailed instructions. The general steps are:
- Disconnect the battery and shift the outboard into neutral.
- Drain the gearcase oil from the lower unit.
- Remove the bolts securing the lower unit (gearcase) to the upper leg and carefully lower it.
- Unbolt and remove the water pump housing to access the old impeller. Note the orientation of the old impeller vanes.
- Clean the housing and faceplate, removing any old gasket material or debris.
- Install the new gaskets, impeller key, and impeller. Bend the vanes in the correct rotational direction as you slide the housing down.
- Bolt the housing back on, torquing bolts to the manufacturer's specification.
- Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
- Refill the gearcase with fresh oil and test the engine in water, confirming a steady stream from the tell-tale port.
Troubleshooting & FAQ
How do I know if this impeller will fit my engine?
The most reliable way to confirm fitment is by checking your engine's serial number against the ranges listed in the compatibility table. While model, HP, and year are important, serial numbers are the most accurate identifier, especially for Mercury and Mariner engines.
What are the signs of a failing water pump impeller?
Common signs include a weak or inconsistent water stream from the "tell-tale" outlet, engine overheating alarms, or a visible reduction in cooling water discharge. Rubber impeller vanes can become brittle, break, or lose their shape over time, reducing pumping efficiency.
How often should I replace my impeller?
As a preventative maintenance item, it is recommended to replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can be shorter if you frequently operate in sandy, silty, or saltwater conditions.
My kit came with two different gaskets. Which one do I use?
This kit is designed to fit multiple housing types, which is why it often includes more than one gasket. Compare the new gaskets directly to the old one you removed from your water pump housing and use the one that is an exact match.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). 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.
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