Sierra 18-3042 Impeller, Replaces Yamaha 67F-44352-00-00, for Yamaha Outboard Engines

The Sierra 18-3042 Impeller is a water pump impeller designed for use in Yamaha outboard engines. It is the wear component inside the lower unit water pump that circulates raw water through the engine block to keep it cool, and it is one of the most common maintenance replacement parts on an outboard.

Each package includes one impeller. The 18-3042 is built with a high speed steel blade construction and a round blade shape. Sierra states that each of its parts meets or exceeds the original equipment part it replaces, making this impeller a direct functional replacement for the OEM Yamaha part it is designed around.

This impeller is intended to be installed as part of a complete water pump service. Sierra recommends pairing the 18-3042 with Sierra's 18-3451 Water Pump Kit or 18-3409 Water Pump Kit with Housing when performing a full pump rebuild, since impellers are typically replaced along with the surrounding pump housing components and gaskets for a proper seal and consistent water flow.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3042
• Product Category: Yamaha Outboard Water Pumps & Impellers 2 Stroke
• Blade Material: High Speed Steel
• Blade Shape: Round
• Color: Multicoloured
• Included Components: Impeller
• Unit Count: 1 impeller per package
• Weight: 0.08 pounds
• UPC: 808282256852

Fitment

Designed for use in Yamaha outboard engines.

Replaces (OEM)

• 67F-44352-00-00

Frequently Asked Questions

What is the Sierra 18-3042 impeller used for? It is a water pump impeller designed for use in Yamaha outboard engines, circulating raw water through the engine to keep it cool.

Does the 18-3042 impeller replace a Yamaha OEM part? Yes, the Sierra 18-3042 directly replaces Yamaha OEM part number 67F-44352-00-00.

How many impellers come in a package? The Sierra 18-3042 package includes one impeller.

What is the impeller blade made of? The 18-3042 impeller has a high speed steel blade construction with a round blade shape.

How much does the 18-3042 impeller weigh? It weighs 0.08 pounds.

Should this impeller be installed alone or with other parts? Sierra recommends installing the 18-3042 as part of a full water pump service, using it with Sierra's 18-3451 Water Pump Kit or 18-3409 Water Pump Kit with Housing.

Is the Sierra 18-3042 a genuine OEM part or aftermarket? It is a Sierra aftermarket replacement impeller, and Sierra states it meets or exceeds the original equipment part it replaces.

What engines is the 18-3042 impeller compatible with? The 18-3042 is designed for use in Yamaha outboard engines.

Is the Sierra 18-3042 interchangeable with any other brand parts? The Sierra 18-3042 is interchangeable with Mallory part number 9-45612.

What UPC is associated with the 18-3042 impeller? The Sierra 18-3042 impeller carries UPC 808282256852.

Do I need a full water pump kit to replace just the impeller? Not necessarily, but Sierra pairs the 18-3042 impeller with its 18-3451 or 18-3409 water pump kits for a complete pump rebuild rather than an impeller-only swap.