6L5-44352;6L5-44352-00 Outboard Water Pump Impeller for Yamaha F2.5 | JLM Marine

Outboard Water Pump Impeller for Yamaha F2.5 2.5HP 4HP 4-Stroke & 3HP 2-Stroke (1988-2021)

This aftermarket water pump impeller is designed to fit Yamaha 4-stroke outboard motors including the F2.5 (2.5 HP) and 4 HP models (2003-2021), as well as Yamaha 2-stroke 3 HP Malta engines (1988-2002). It ensures reliable cooling system performance by maintaining optimal water flow through your outboard's cooling circuit.

This impeller directly replaces Yamaha OEM 6L5-44352-00 and cross-references with multiple aftermarket brands including CEF Marine, Sierra Marine, and Mallory Marine, providing a cost-effective solution without compromising quality.

• 6-blade rubber impeller designed for consistent water circulation
• Precision-molded to OEM specifications for reliable fitment
• Compatible with both 2-stroke and 4-stroke Yamaha small outboards

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

Your purchase includes:

• Water Pump Impeller (1 piece)

Installation Guide

1. Disconnect the fuel line and remove the spark plug wire to ensure the engine cannot start during service.
2. Remove the lower unit from the outboard motor following your engine's service manual. This typically requires draining the gear oil and disconnecting shift linkage.
3. Locate and remove the water pump housing by unscrewing the retaining bolts. Keep track of all fasteners and gaskets.
4. Extract the old impeller carefully using needle-nose pliers or a suitable tool. Inspect the housing for scoring, debris, or corrosion.
5. Clean the pump housing thoroughly with a soft brush and solvent, removing any residue or old gasket material.
6. Lubricate the new impeller blades with water pump grease or glycerin to prevent tearing during installation.
7. Install the new impeller into the housing, ensuring all blades are oriented in the correct rotational direction (usually counterclockwise when viewed from above).
8. Replace the gaskets and O-rings with new ones if available to ensure a proper seal.
9. Reassemble the water pump housing and torque all bolts to manufacturer specifications.
10. Reinstall the lower unit onto the motor, reconnect the shift linkage, and refill the gear oil to the proper level.
11. Reconnect the fuel line and spark plug wire. Start the engine and verify that water flows properly from the tell-tale outlet.
12. Inspect for leaks around the pump housing and ensure the engine maintains proper operating temperature.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Yamaha outboard?
A: Cross-reference your engine model and year with our compatibility table above. Verify your original impeller's OEM part number (stamped on the old part or listed in your service manual) matches one of the numbers in our cross-reference table. Measure your old impeller's diameter and blade count to double-check.

Q: How often should I replace my water pump impeller?
A: Most manufacturers recommend replacing the impeller every 2-3 years or 200-300 hours of operation, whichever comes first. If your engine overheats, shows reduced water flow from the tell-tale, or if you've run the engine dry even briefly, inspect and replace the impeller immediately.

Q: What are the signs of a failing water pump impeller?
A: Common symptoms include weak or no water discharge from the tell-tale outlet, engine overheating, steam from the powerhead, or an alarm/warning light activating. You may also notice reduced performance or unusual engine noises due to overheating.

Q: Can I install this impeller myself or do I need a mechanic?
A: If you have mechanical experience and the proper tools, you can replace the impeller yourself by following your engine's service manual. However, professional installation is recommended to ensure correct orientation, proper sealing, and torque specifications are met.

Q: Will this aftermarket impeller perform as well as the Yamaha OEM part?
A: Yes, this impeller is manufactured to OEM specifications using comparable-grade rubber compounds. It is designed to deliver the same flow rate, durability, and fit as the original Yamaha part at a more competitive price point.

Q: What's the difference between OEM and aftermarket impellers?
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.