Sierra 18-3466 Water Pump Kit with Housing, Replaces Yamaha 6H3-W0078-01

The Sierra 18-3466 Water Pump Kit with Housing is a complete replacement water pump assembly for Yamaha outboard engines, built to restore proper cooling system flow and pressure. Each kit includes the housing along with the impeller and companion components needed to complete the job in one part number, so there is no need to source individual pieces separately. Sierra formulates the impeller compound for each kit based on the size and application it is designed for, and every other component in the kit is built to meet or exceed the original manufacturer specifications. This kit is assembled in Sierra's Illinois factory and is intended for outboard applications, giving boat owners a direct, factory-spec replacement option for a worn or failing water pump. Cooling system water pumps are a routine maintenance item on outboard motors, and replacing the housing along with the impeller at the same time helps ensure a proper seal and consistent water flow through the powerhead. The 18-3466 kit corresponds to the Yamaha 6H3-W0078-01 water pump housing assembly, making it a straightforward match for boat owners who have identified that OEM number on their engine or in their parts manual. Keeping this kit on hand or installing it proactively helps prevent overheating issues caused by a degraded impeller or a worn housing surface.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3466
• Product Name: Water Pump Kit with Housing
• Included Components: Water Pump Kit with Housing
• Unit Count: 1
• Weight: 0.71 pounds
• Package Dimensions: 14.0 H x 9.5 L x 12.1 W (centimetres)
• Country of Origin: Taiwan
• Fit Type: Universal
• Vehicle Service Type: Boat
• Category: Yamaha Outboard Water Pumps and Impellers 2 Stroke
• UPC: 808282287061

Fitment

• Yamaha outboard engines using the 6H3-W0078-01 water pump housing assembly

Replaces (OEM)

• 6H3-W0078-01

Frequently Asked Questions

What does the Sierra 18-3466 water pump kit include? The kit includes the water pump housing along with the impeller and the other components needed to complete a full water pump replacement on the applicable Yamaha outboard, all under part number 18-3466.

Is the 18-3466 kit a direct replacement for the Yamaha 6H3-W0078-01 pump housing? Yes, the Sierra 18-3466 water pump kit corresponds to the Yamaha 6H3-W0078-01 water pump housing assembly, so it can be ordered using either that OEM number or the Sierra part number 18-3466.

How much does the 18-3466 water pump kit weigh? The Sierra 18-3466 Water Pump Kit with Housing weighs 0.71 pounds.

What are the packaged dimensions of this water pump kit? As packaged, the Sierra 18-3466 kit measures 14.0 cm high by 9.5 cm long by 12.1 cm wide.

Where is the Sierra 18-3466 water pump kit manufactured? This kit's country of origin is Taiwan, though final assembly of Sierra water pump kits is done at Sierra's Illinois factory.

Does the impeller in this kit meet original equipment specifications? The impeller compound in the 18-3466 kit is formulated based on the pump's size and application, and the kit's other components are built to meet or exceed original manufacturer specifications.

Is this water pump kit meant for outboard, inboard, or sterndrive engines? The Sierra 18-3466 kit is intended for outboard engine applications, specifically Yamaha outboards using the 6H3-W0078-01 pump housing.

How many units come in one order of part number 18-3466? One order of the Sierra 18-3466 water pump kit includes a single complete kit (unit count of 1).

Does the 18-3466 kit include the pump housing or just the impeller? It includes both; the 18-3466 is sold as a water pump kit with housing, not an impeller-only kit.

What is the UPC for the Sierra 18-3466 water pump kit? The UPC for the Sierra 18-3466 Water Pump Kit with Housing is 808282287061.