Sierra 18-8920 Water Pump Impeller, White, Fits Mercury 8B and 98B Outboard Models

The Sierra 18-8920 is a white water pump impeller built to circulate raw cooling water through the lower unit of compatible Mercury outboard motors. As the impeller wears, cooling flow drops and the engine runs hotter, so a fresh impeller at the recommended service interval keeps the water pump delivering full flow to the powerhead. This impeller is engineered to meet or exceed the performance of the original equipment part it replaces, and it is built to Sierra's standard for withstanding the demands of high-horsepower engines operating in the harsh marine environment.

The 18-8920 is designed for Mercury 8 (8B models) and Mercury 98 (98B model) outboards, including the 8 4-Stroke (All) and 98 4-Stroke (All) applications. Installing the correct impeller for your specific model is important, since an impeller sized or shaped for a different water pump housing will not seal or pump correctly. This is a single impeller, sold as one item, intended as a service replacement part for the outboard's water pump housing.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8920
• Color: White
• UPC: 808282256890
• GTIN: 00808282256890
• Weight: 0.06 pounds
• Number of Items: 1
• Category: Mercury Outboard Water Pumps & Impellers

Fitment

• Mercury 8 (8B models)
• Mercury 98 (98B model)
• Mercury 8 4-Stroke (All)
• Mercury 98 4-Stroke (All)

Frequently Asked Questions

What does the Sierra 18-8920 impeller fit? The 18-8920 is built for Mercury 8 (8B models) and Mercury 98 (98B model) outboards, including the 8 4-Stroke (All) and 98 4-Stroke (All) applications.

What color is the 18-8920 impeller? It is white, which is the standard color for this Sierra impeller.

How much does the 18-8920 weigh? The Sierra 18-8920 impeller weighs 0.06 pounds.

How many impellers come in one order? One order of the 18-8920 includes a single impeller (number of items: 1).

Is the Sierra 18-8920 an OEM part or an aftermarket replacement? The 18-8920 is a Sierra replacement impeller engineered to meet or exceed the performance of the original equipment part it replaces on Mercury 8 (8B) and 98 (98B) outboards.

Will the 18-8920 fit a 4-stroke Mercury outboard? Yes, the 18-8920 covers the 8 4-Stroke (All) and 98 4-Stroke (All) Mercury models in addition to the 8B and 98B models.

What is the UPC for the Sierra 18-8920 impeller? The UPC for the Sierra 18-8920 water pump impeller is 808282256890.

What category of part is the 18-8920? The 18-8920 is a water pump impeller listed under Mercury Outboard Water Pumps & Impellers.

Does the 18-8920 come with a warranty? The Sierra 18-8920 impeller is covered under Sierra's standard customer satisfaction warranty.

Why does an outboard need a new impeller? A worn water pump impeller reduces raw water flow to the engine's cooling system, and the Sierra 18-8920 is a direct replacement impeller to restore that flow on compatible Mercury 8B and 98B outboards.