Water Pump Impeller Kit – Fits Mercury Marine 6-15 HP (Replaces 47-42038-2, 42038Q02, Sierra 18-3062)

$11.95 $19.00

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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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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

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

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.

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