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

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

This water pump impeller is designed for Yamaha 2HP 2-Stroke (1984–2002) outboard motors, serving as a crucial component for the engine's cooling system. It ensures proper water circulation to prevent overheating.

This component is a direct replacement for several OEM and aftermarket part numbers, including Sierra 18-3072, Aqua Power 2171, GLM 89840, Mallory 9-45607, and CEF 500324.

• Installation Location: Mounts in the lower unit water pump housing.
• Material: Constructed from durable, high-quality rubber/neoprene for reliable performance.
• Package Contents: Includes one water pump impeller.

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)

Explosion Diagram

Installation Guide

1. Disconnect the negative battery cable for safety.
2. Place the outboard in neutral and remove the bolts securing the lower unit (gearcase). Carefully separate the lower unit from the upper housing.
3. Locate the water pump assembly on top of the lower unit. Remove the bolts to lift the pump cover.
4. Take note of the blade orientation before lifting the old impeller off the driveshaft.
5. Clean any sediment or corrosion from the inside of the pump housing and from the wear plate.
6. Lightly lubricate the new impeller with marine-grade grease or a soap-and-water solution.
7. Slide the new impeller onto the driveshaft while turning the shaft clockwise to properly seat the blades inside the housing.
8. Reinstall the pump cover and torque the bolts to the manufacturer's specified value.
9. Realign the lower unit, ensuring the driveshaft and water tube are correctly seated, and secure it with its bolts.
10. Reconnect the battery cable. Start the engine using a water supply to verify water is pumping correctly from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this impeller fits my Yamaha 2HP engine?
Refer to the "Compatible Engine Models" table. This impeller is specifically for Yamaha 2HP 2-stroke models manufactured between 1984 and 2002. Cross-reference your engine's model and year to ensure a match.

What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating, a weak or intermittent water stream from the tell-tale port, or a total lack of water flow, which indicates the cooling system is not functioning.

How often should I replace the impeller?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 seasons or after every 100-200 hours of operation, particularly if you frequently run your engine in saltwater or sandy/silty conditions.

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.