Sierra Impeller 18-3073, OEM 6E0-44352-00-00, for Mercury/Mariner and Yamaha Outboard Engines

The Sierra 18-3073 Impeller is a replacement water pump impeller engineered for Mercury/Mariner and Yamaha outboard engines. The impeller is the wear component inside the outboard's water pump that circulates raw water through the powerhead for cooling, and it is one of the most common maintenance replacements on any outboard motor. This impeller is molded in white and is sold individually, one impeller per package, so it drops into an existing water pump housing during a routine service or repair.

Each Sierra product is built to meet or exceed the original equipment part it replaces, making the 18-3073 a direct functional replacement for the OEM impeller used in these outboard applications. It is designed to work alongside Sierra's own water pump housing and repair components, including the 18-48619 Complete Water Pump Kit and the 18-3473 Water Pump Repair Kit with Housing, for owners performing a full water pump service rather than an impeller-only swap. Because impellers are fit specific to a given water pump housing and engine, buyers should confirm part numbers against their engine before ordering to ensure proper fit.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3073
• Product Type: Impeller
• Color: White
• Unit Count: 1 impeller per package
• Weight: 0.01 pounds
• Recommended Use: Replacement and maintenance of Mercury/Mariner and Yamaha outboard engines
• UPC: 030999315250

Fitment

• Mercury/Mariner outboard engines
• Yamaha outboard engines

Replaces (OEM)

• 6E0-44352-00-00

Frequently Asked Questions

What engines does the Sierra 18-3073 impeller fit? The Sierra 18-3073 impeller is designed for use with Mercury/Mariner and Yamaha outboard engines. Since impellers are fit specific, confirm your engine's part numbers before ordering to ensure proper fit.

What OEM part number does the 18-3073 replace? The Sierra 18-3073 impeller corresponds to OEM number 6E0-44352-00-00.

How many impellers come in one package? One impeller is included per package of the Sierra 18-3073.

What color is the Sierra 18-3073 impeller? It is molded in white.

How much does the 18-3073 impeller weigh? The Sierra 18-3073 impeller weighs 0.01 pounds.

Is the Sierra 18-3073 a genuine OEM part or aftermarket? The 18-3073 is a Sierra-manufactured replacement part, not an OEM Mercury or Yamaha part, though Sierra states it meets or exceeds the original equipment part it replaces.

Do I need any other parts to replace my water pump impeller? For a full water pump service, the 18-3073 impeller is designed to be used alongside Sierra's 18-48619 Complete Water Pump Kit or the 18-3473 Water Pump Repair Kit with Housing, in addition to the impeller alone if only the impeller needs replacing.

What is included in the box with the 18-3073? The package includes one Sierra 18-3073 impeller only; the housing, insert cup, and impeller pin are separate components.

Can I use the 18-3073 impeller on any outboard engine? No. The 18-3073 is intended specifically for Mercury/Mariner and Yamaha outboard engines, and fitment is part specific, so buyers should verify part numbers against their engine before purchase.

What is the UPC for the Sierra 18-3073 impeller? The UPC for the Sierra 18-3073 impeller is 030999315250.