Sierra 18-3002 Impeller - Replaces OMC 375638 - Evinrude Outboard Water Pump

The Sierra 18-3002 is a water pump impeller built as a direct replacement for the cooling system on Evinrude outboard motors. The impeller is the core wear component inside an outboard's water pump, drawing raw water through the lower unit and circulating it to cool the powerhead. Over time impeller vanes lose flexibility and wear down, reducing water flow and putting the engine at risk of overheating, so replacing the impeller on schedule or at the first sign of reduced water pressure is a routine part of outboard maintenance.

The Sierra 18-3002 is supplied as a single impeller (one item included) and is cross-referenced to OMC part number 375638, making it straightforward to identify as the correct replacement for engines that originally used that OEM part. It is categorized for Evinrude outboard water pump service and carries UPC 030999237125 for verification when ordering.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3002
• Product Type: Impeller
• Included Components: Impeller
• Number of Items: 1
• Weight: 0.08 pounds
• UPC: 030999237125
• Category: Evinrude Outboard Water Pumps and Impellers
• OEM Cross-Reference: 375638

Fitment

Designed for Evinrude outboard water pump applications.

Replaces (OEM)

• 375638

Frequently Asked Questions

What does the Sierra 18-3002 impeller replace? The Sierra 18-3002 is cross-referenced to OMC part number 375638, so it is the correct replacement wherever that OEM number is called for.

Is the Sierra 18-3002 a genuine Sierra part or a generic aftermarket copy? It is a Sierra-branded impeller, part number 18-3002, sold as a cataloged aftermarket replacement for the OMC 375638 impeller.

How much does the 18-3002 impeller weigh? The Sierra 18-3002 impeller weighs 0.08 pounds.

What is included when I order part number 18-3002? Ordering Sierra 18-3002 gets you one impeller; the number of items included is 1.

What outboards is this impeller used on? The Sierra 18-3002 is listed under Evinrude outboard water pumps and impellers, for use in the water pump cooling system on applicable Evinrude outboard motors.

How can I confirm I am ordering the right impeller? Sierra 18-3002 carries UPC 030999237125, which can be checked against your order or packaging to confirm it is the correct part.

What does an impeller like the 18-3002 actually do? It is the rotating vaned component inside the outboard's water pump that draws in raw water and pushes it through the engine to keep the powerhead cool.

When should the 18-3002 impeller be replaced? An impeller such as the Sierra 18-3002 should be replaced when water pump output drops or the impeller vanes show wear, since a worn impeller reduces cooling water flow to the engine.

Does the Sierra 18-3002 come as just the impeller or with other water pump parts? Sierra 18-3002 is the impeller only, listed with included components of one impeller and a quantity of 1.