Water Pump Impeller – Fits Yamaha 2HP 2-Stroke Outboards (Replaces 646-44352-01-00)

Water Pump Impeller – Fits Yamaha 2HP 2-Stroke Outboards (Replaces 646-44352-01-00)

This water pump impeller is a direct replacement for Yamaha 2HP 2-stroke portable outboard motors manufactured from 1989 through 2002. It is a crucial component for maintaining proper engine cooling.

This part replaces the following OEM and aftermarket part numbers: Yamaha 646-44352-01-00, Sierra 18-3074, GLM 89880, and Mallory 9-45605.

• Installation: Direct replacement for the original OEM part.
• Material: Constructed from high-quality, durable neoprene rubber for reliable performance.
• Function: Restores cooling system efficiency to prevent engine overheating.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Impeller (646-44352-01-00)

Installation Guide

1. Disconnect the negative battery cable and remove the engine's top cowling.
2. Place the outboard in neutral and remove the bolts connecting the lower unit (gearcase) to the upper driveshaft housing.
3. Gently separate the lower unit from the rest of the engine to expose the water pump.
4. Unscrew the bolts on the water pump housing and lift it off. Note the orientation of the old impeller vanes.
5. Remove the old impeller from the driveshaft. You may need to remove a small Woodruff key.
6. Clean any debris or corrosion from the pump housing, wear plate, and driveshaft.
7. Lightly lubricate the new impeller and the inside of the pump housing with marine grease.
8. Install the Woodruff key, then slide the new impeller onto the driveshaft, turning it in the direction of engine rotation to seat the vanes correctly.
9. Reinstall the water pump housing and tighten the bolts to the manufacturer's specified torque.
10. Carefully guide the lower unit back into position, ensuring the driveshaft and water tube align correctly.
11. Secure the lower unit with its mounting bolts.
12. Reconnect the battery and test the engine in a suitable water supply to ensure a strong, steady stream from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my 2HP Yamaha?

A: This impeller is specifically designed for Yamaha 2HP 2-stroke outboards made between 1989 and 2002. To ensure a perfect match, please compare your engine model (e.g., 2MSHY, 2SD) against our detailed compatibility list and verify that your existing part number is 646-44352-01-00.

Q: What are the signs of a failing water pump impeller?

A: Common indicators of a worn or damaged impeller include the engine overheating, a weak or intermittent water stream from the "tell-tale" cooling outlet, or, upon inspection, discovering cracked, brittle, or missing blades on the old impeller.

Q: How often should I replace my outboard's impeller?

A: As a key part of preventative maintenance, we recommend inspecting and replacing the water pump impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can vary based on usage and water conditions (e.g., saltwater vs. freshwater).

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.