UANOFCN 77177A3 Water Pump Impeller Kit with Housing for Mercury Marine 30-70 HP Outboards
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Description
xKeep Your Mercury Marine 2-Cycle Outboard Cool
The UANOFCN 77177A3 Water Pump Impeller Kit with Housing is designed for Mercury Marine 2-Cycle outboards in the 30 Jet to 70 HP range. This kit supports a full water pump refresh when replacing worn components and seals, helping maintain efficient coolant flow in everyday use.
What this kit offers
Designed with compatibility and ease of installation in mind, the set includes everything needed to refresh the water pump and restore the flow path. For the best result, pair this kit with the 26-38452 Seal and 26-38453 Washer Kit during installation.
- Water Pump Impeller
- Impeller Plate
- Impeller Key
- Water Pump Housing
- Water Pump Base
- Water Pump Base Gasket
- Lower Water Pump Gasket
- Upper Water Pump Gasket
- Drain Screw Gasket
- Rubber Washer
- O-Ring
Compatibility and replacement notes
Fits Mercury Marine 2-Cycle 30 Jet and 35-70 HP outboards. This kit also serves as a replacement for OEM numbers such as 46-77177A3 and Sierra 18-3324, aligning with Mallory 9-48312 and GLM 12100. Before starting, verify model and pair with the seal and washer kit for an installation that minimizes leak risk.
- Fits Mercury Marine 2-Cycle 30 Jet through 70 HP outboards
- Replaces OEM numbers including 46-77177A3 and Sierra 18-3324
- Requires 26-38452 Seal and 26-38453 Washer Kit for full installation
- Includes comprehensive components for a complete water pump refresh
Real-world use and care
In practical terms, a refreshed water pump helps move coolant through the engine cooling loop, supporting stable temperatures during boating, towing, or idle periods. Users may notice smoother engine operation and reduced heat buildup when the cooling system is well maintained.
Installation tips and best practices
Follow these steps to maximize performance and minimize leaks. Clean surfaces, inspect gasket surfaces, and replace worn seals and O-rings. Use proper lubrication on moving parts and torque fasteners according to guidance from your service manual.
- Prepare the cooling loop and ensure the engine is cool before work
- Replace all gaskets and O-rings to prevent leaks
- Torque fasteners per OEM guidance and use recommended lubricants
- Verify fitment against OEM part numbers listed in compatibility notes
Durability, quality, and fit
This kit provides a practical refresh option for outboard cooling systems, with attention to compatibility and a complete parts list. While not a guarantee of performance, the components align with common Mercury Marine configurations and support reliable operation when installed correctly.
Important notes
Note the requirement to pair this kit with the 26-38452 Seal and 26-38453 Washer Kit for complete installation. Always consult your model’s service manual to confirm compatibility before purchase.
FAQ
Q: What models is this kit compatible with?
A: Designed for Mercury Marine 2-Cycle 30 Jet through 70 HP outboards; confirm compatibility for your model.
Q: What does the kit include?
A: Impeller, housing, plate, key, gaskets, seals, and hardware for a full pump replacement.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 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.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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