Water Pump Impeller Kit – Fits Mercury/Mariner 6-15 HP Outboards (Replaces 47-42038-2, 47-42038Q02)
Water Pump Impeller Kit – Fits Mercury/Mariner 6-15 HP Outboards (Replaces 47-42038-2, 47-42038Q02) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
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 Outboards (R...
Product Details
This Water Pump Impeller Kit – Fits Mercury/Mariner 6-15 HP Outboards (Replaces 47-42038-2, 47-42038Q02) is a direct replacement part designed to restore your engine's cooling system. It is engineered for a broad range of models, including Mercury/Mariner 6-15 HP 2-Stroke (Serial 0A197112 & Up), 8-9.9 HP 4-Stroke (2004 & Prior), 15 HP 4-Stroke (323cc), and Force 9.9-15 HP (1998) outboards.
This kit serves as a direct interchange for Mercury part numbers 47-42038, 47-42038-2, 47-42038Q02, 47-420381, and 47-420382, as well as common aftermarket cross-references including Sierra 18-3062, GLM 89451, and Mallory 9-45309.
- Impeller is molded from a durable neoprene compound for reliable performance and long service life in marine environments.
- Includes the essential gaskets and impeller key required for a complete water pump service.
- Engineered to meet or exceed original equipment specifications for fit, form, and function.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 47-42038 |
| Mercury | 47-42038-2 |
| Mercury | 47-42038Q02 |
| Mercury | 47-420381 |
| Mercury | 47-420382 |
| Sierra | 18-3062 |
| GLM | 89451 |
| Mallory | 9-45309 |
| Mallory | 9-45309-10 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury/Mariner models, fitment is often defined by serial number. Please verify your engine's serial number against the ranges provided before ordering.
For Force outboards, this kit fits specific 9.9 HP and 15 HP models from the 1998 model year.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury/Mariner | 6 HP | 6 | 2-Stroke | Serial A197112 & Up | 47-42038-2 | |
| Mercury/Mariner | 6 HP | 6 | 2-Stroke | Serial OT800749 & Up | 47-42038-2 | |
| Mercury/Mariner | 8 HP | 8 | 2-Stroke | Serial A197112 & Up | 47-42038-2 | |
| Mercury/Mariner | 8 HP (Bodensee) | 8 | 4-Stroke | Serial G760300 & Up | 47-42038-2 | International model |
| Mercury/Mariner | 9.9 HP | 9.9 | 2-Stroke | Serial A197112 & Up | 47-42038-2 | |
| Mercury/Mariner | 9.9 HP | 9.9 | 4-Stroke | 2004 & Prior | 47-42038-2 | Standard case |
| Mercury/Mariner | 9.9 HP | 9.9 | 4-Stroke | Serial G760300-T979999 | 47-42038-2 | |
| Mercury/Mariner | XR10 SeaPro | 10 | 2-Stroke | Serial D038000 & Up | 47-42038-2 | |
| Mercury/Mariner | 15 HP | 15 | 2-Stroke | Serial B292414 & Up | 47-42038-2 | |
| Mercury/Mariner | 15 HP | 15 | 4-Stroke | 323cc, MY2008 & Prior | 47-42038-2 | |
| Mercury/Mariner | 15 SeaPro | 15 | 2-Stroke | Serial G044365 & Up | 47-42038-2 | |
| Force | 9.9 HP | 9.9 | 2-Stroke | 1998 | 47-42038-2 | |
| Force | 15 HP | 15 | 2-Stroke | 1998 | 47-42038-2 |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Material
- Neoprene
- Dimensions
- 58.8mm diameter × 11.7-11.9mm depth (2.315" × 0.469")
- Shaft Diameter
- 12.6-13mm (0.496-0.512")
- Warranty
- 1 Year
What’s in the Box
- 1 x Neoprene Impeller (47-42038-2)
- 1 x Gasket (27-19202)
- 1 x Gasket (27-19204-3)
- 1 x Impeller Key
Installation Notes
- Disconnect the battery and spark plug leads for safety.
- Remove the bolts securing the lower unit (gearcase) to the engine.
- Carefully drop the lower unit to gain access to the water pump assembly.
- Unscrew the bolts on the water pump housing and remove the cover.
- Take note of the old impeller's vane direction before removing it and the woodruff key.
- Inspect the pump housing and wear plate for grooves, warping, or damage. Clean all surfaces.
- Install the new key and slide the new impeller onto the driveshaft. Turn the driveshaft clockwise to help bend the vanes into the correct orientation.
- Position the new gaskets correctly and reinstall the water pump housing, tightening bolts to the manufacturer's specified torque.
- Reattach the lower unit, ensuring the shift shaft and water tube are properly aligned.
- Once assembled, use a water source (like flushing muffs) to run the engine and verify a strong, steady stream from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this impeller will fit my engine?
The most accurate method is to check your engine's serial number against the compatibility chart. While this kit fits a wide range of models, serial number breaks are the definitive guide for ensuring a proper match, especially for Mercury/Mariner engines.
What are the signs of a failing water pump impeller?
The most common sign is a weak, intermittent, or non-existent water stream from the "tell-tale" cooling outlet. Other indicators include an engine overheating alarm, steam from the exhaust, or the engine itself feeling excessively hot to the touch.
How often should I replace the impeller?
For preventative maintenance, it's best practice to inspect the impeller annually and replace it every 1-2 years or 100-200 hours of operation. If you frequently operate in sandy, silty, or saltwater, more frequent replacement is recommended.
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.
Payment & Security
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