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

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

This water pump impeller is designed for Yamaha 2-Stroke 2HP outboard engines, including models 2C, 2CMH, and 2DMH from 1989–2019. It serves as a direct-fit replacement, ensuring reliable performance for your engine's cooling system.

It replaces multiple aftermarket part numbers, including Sierra 18-3072, Mallory CEF500324, and GLM 89850.

• Engineered for direct-fit installation.
• Constructed from durable, high-strength neoprene rubber.
• Restores cooling performance 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. Ensure the engine is off and the battery is disconnected.
2. Remove the lower unit mounting bolts and carefully detach the gearcase assembly.
3. Locate and unbolt the water pump housing cover.
4. Note the rotational direction of the old impeller's vanes before removal.
5. Slide the old impeller off the drive shaft, being careful to remove the drive key.
6. Thoroughly clean the impeller housing and inspect it for any signs of wear or damage.
7. Apply a light coat of marine grease to the new impeller and inside the housing.
8. Install the new key and slide the new impeller onto the shaft, rotating it in the correct direction to bend the vanes properly.
9. Reinstall the housing cover and tighten the bolts to the manufacturer's specified torque.
10. Reattach the lower unit, ensuring all connections are secure.
11. Reconnect the battery, start the engine using a water supply, and confirm a steady stream from the tell-tale port.

Troubleshooting & FAQ

How can I be sure this impeller fits my Yamaha 2HP?
This impeller fits Yamaha 2HP models 2C, 2CMH, and 2DMH manufactured between 1989 and 2019. Please cross-reference your engine model and year with the "Compatible Engine Models" table. You can also verify the OEM part number is 646-44352-01-00.

What are the signs of a failing water pump impeller?
Common signs include a weak or intermittent water stream from the tell-tale port, engine overheating alarms, or a noticeable drop in engine performance.

How often should the impeller be replaced?
For optimal engine protection, we recommend replacing the water pump impeller every 100-200 service hours or at least once a year, whichever comes first.

OEM vs. Aftermarket?
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.

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

What is your warranty and return policy?
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.