Water Pump Impeller Kit – Fits Mercury Marine 6-15 HP (Replaces 47-42038-2, 42038Q02, Sierra 18-3062)
Water Pump Impeller Kit – Fits Mercury Marine 6-15 HP (Replaces 47-42038-2, 42038Q02, Sierra 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
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Water Pump Impeller Kit – Fits Mercury Marine 6-15 HP (Replaces 47-...
Water Pump Impeller Kit – Fits Mercury Marine 6-15 HP (Replaces 47-42038-2, 42038Q02, Sierra 18-3062) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit is designed for a range of Mercury Marine and Force/Chrysler outboards. It provides a reliable solution for replacing the water pump impeller in Mercury 6–15 HP 2-Stroke outboards (serial 0A197112 & up), 8–9.9 HP 4-Stroke models (2004 & prior), specific 15 HP 4-Stroke models (323cc, 2008 & prior), and select Force/Chrysler 9.9–15 HP outboards.
It serves as a direct replacement for Mercury Marine part numbers 47-42038-2, 47-420381, and 47-42038Q02, while also cross-referencing with GLM 89451, Mallory 9-45309, and Sierra 18-3062.
- Installation: Engineered for a direct OEM replacement fit.
- Material: Made with durable neoprene rubber for reliable performance in marine environments.
- Kit Includes: Impeller, gaskets, and impeller key for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury Marine | 47-42038-2 |
| Mercury Marine | 47-420381 |
| Mercury Marine | 47-42038Q02 |
| GLM | 89451 |
| Mallory Marine | 9-45309 |
| Mallory Marine | 9-45309-10 |
| Sierra | 18-3062 |
Engine & Model Compatibility
Confirm your engine model and year in the tables below.
For Mercury Marine Engines: Check your engine's serial number or year to ensure it falls within the specified range.
For Force/Chrysler Engines: This kit fits select 9.9 HP and 15 HP models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | Outboard | 6 | 2-Stroke | Serial 0A197112 & Up | 47-42038-2 | |
| Mercury | Outboard | 8 | 2-Stroke | Serial 0A197112 & Up | 47-42038-2 | |
| Mercury | Outboard | 9.9 | 2-Stroke | Serial 0A197112 & Up | 47-42038-2 | |
| Mercury | Outboard | 15 | 2-Stroke | Serial 0A197112 & Up | 47-42038-2 | |
| Mercury | Outboard | 8 | 4-Stroke | 2004 & Prior | 47-42038-2 | |
| Mercury | Outboard | 9.9 | 4-Stroke | 2004 & Prior | 47-42038-2 | |
| Mercury | Outboard | 15 | 4-Stroke | 2008 & Prior | 47-42038-2 | 323 CC |
| Force | Outboard | 9.9 | 47-42038-2 | |||
| Force | Outboard | 15 | 47-42038-2 |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Material
- Neoprene Rubber
- Installation
- Direct OEM Replacement
- Application
- Marine Outboard Engines
What’s in the Box
- 1 x Neoprene Impeller (Replaces 47-42038)
- 1 x Gasket (Replaces 27-19202)
- 1 x Gasket (Replaces 27-19204)
- 1 x Impeller Key
Installation Notes
- Disconnect the battery and shift the engine into neutral.
- Place a drain pan under the lower unit and remove the gearcase oil drain screw to empty the oil.
- Remove the bolts securing the lower unit (gearcase) to the engine's upper housing.
- Carefully lower the gearcase to access the water pump housing.
- Unscrew the bolts on the water pump housing cover and remove it.
- Take note of the old impeller's vane direction before removing it and the impeller key.
- Clean the housing and install the new gaskets, impeller key, and impeller. Ensure the new impeller vanes are oriented in the correct rotational direction.
- Re-install the housing cover, re-attach the lower unit, and refill the gearcase with fresh oil.
- Reconnect the battery and test the engine in water to verify water is exiting the tell-tale port.
Troubleshooting & FAQ
How do I confirm this kit fits my specific engine?
The best way is to match your engine's model, year, and serial number against the compatibility table. If available, cross-reference the part number stamped on your old impeller with the numbers in our Part Number Matrix.
What are the signs of a failing water pump impeller?
Common symptoms include engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet port, and a dry, cracked, or brittle appearance on the old impeller upon inspection.
How often should I replace my outboard's impeller?
As a general maintenance guideline, it is recommended to inspect and/or replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. Usage in saltwater or sandy/silty conditions may require more frequent replacement.
What is the difference between this impeller and the OEM version?
This is an aftermarket part designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, material durability, and performance. It offers a cost-effective alternative to the original brand-name part without compromising quality.
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 and specifications against 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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