Sierra 18-3051 Impeller, Replaces 395289

The Sierra 18-3051 is an aluminum impeller built for outboard engine water pumps, designed as a direct replacement for OEM part 395289. As the wear component inside the water pump housing, the impeller drives raw water through the cooling system to keep the engine running at safe operating temperatures; a worn, cracked, or missing vane is one of the most common causes of overheating and reduced cooling flow. The 18-3051 is constructed from aluminum for durability under continuous rotation and contact with the pump housing, and it is rated for use in salt water as well as fresh water service, making it suitable for coastal and offshore applications where corrosion resistance and consistent water flow matter. It operates automatically as part of the engine's cooling circuit, requiring no separate controls once installed. This impeller is sold as a single unit and is intended to be installed as part of a routine water pump service, alongside inspection of the pump housing, wear plate, and gaskets. Sierra manufactures this part to be a straightforward OEM equivalent, so buyers replacing a worn factory impeller can order by the OEM number 395289 or the Sierra part number 18-3051 and get the correct replacement without needing to identify additional cross-reference numbers.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3051
• Replaces (OEM): 395289
• Weight: 0.08 pounds
• Material: Aluminum
• Color: Black
• Engine Type: 4 Stroke
• Mounting Type: Engine Mount
• Fuel Type: Gasoline
• Recommended Use: For Salt Water
• UPC: 030999315076
• Item Type: Impeller

Fitment

Fits engines using OEM impeller 395289; verify against your engine's original part number before ordering.

Replaces (OEM)

• 395289

Frequently Asked Questions

What does the Sierra 18-3051 impeller replace? The Sierra 18-3051 is a direct replacement for OEM part number 395289.

Is the 18-3051 impeller made of rubber or aluminum? The impeller body and mounting hub are constructed from aluminum, though impellers of this type typically pair a metal hub with flexible drive vanes for pumping water.

Can the Sierra 18-3051 be used in salt water? Yes, this impeller is rated for salt water use as well as fresh water applications.

What color is the 18-3051 impeller? It is black in color.

How much does the Sierra 18-3051 weigh? The 18-3051 impeller weighs 0.08 pounds.

Does the 18-3051 come with the water pump housing or gaskets? No, the package includes the impeller only; it does not include the pump housing, wear plate, or gaskets.

How do I know if my impeller needs replacing? Reduced or no water flow from the engine's telltale, overheating, or visibly cracked or missing vanes on the old impeller are signs it is time to install a replacement like the Sierra 18-3051.

Is the Sierra 18-3051 an OEM part or an aftermarket part? It is a Sierra aftermarket impeller manufactured as an equivalent to OEM part 395289, not an OEM-branded part.

What engine type is the 18-3051 impeller designed for? It is listed for 4 stroke engines with a gasoline fuel type and an engine-mounted water pump.

Does the operation of the 18-3051 impeller require any manual controls? No, the 18-3051 operates automatically as part of the engine's cooling water pump once installed.

How many impellers come in one order of part 18-3051? One order includes a single 18-3051 impeller unit.