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

Water Pump Impeller with Key – Fits Yamaha F2.5 4-Stroke & 3 HP 2-Stroke Outboards

This high-quality aftermarket water pump impeller with key is engineered to fit Yamaha 2.5 HP 4-stroke (F2.5) outboards from 2003–2021 and Yamaha 3 HP 2-stroke (Malta) models from 1988–2002. Designed to meet OEM specifications, this impeller ensures reliable cooling performance for your marine engine.

Direct replacement for: Yamaha 6L5-44352-00-00, 6L5-44352-00, CEF Marine 500322, Sierra Marine 18-8911, and Mallory Marine 9-45615.

• Package includes: Outboard rubber impeller with key/pin
• 6-blade design with precise OEM-equivalent dimensions
• Critical component for maintaining optimal engine temperature

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 package includes:

• Water Pump Impeller with Key/Pin

Installation Guide

1. Disconnect the fuel line and remove the propeller for safety. Tilt the engine to a comfortable working position.
2. Remove the lower unit by unscrewing the mounting bolts that secure it to the mid-section. Gently separate the lower unit from the driveshaft.
3. Access the water pump housing by removing the pump cover plate or housing bolts. Take note of the order and orientation of components.
4. Remove the old impeller carefully; inspect the housing and wear plate for scoring or damage. Clean all surfaces thoroughly.
5. Lubricate the new impeller blades with a water-based lubricant or glycerin to prevent tearing during installation.
6. Insert the key/pin into the impeller hub slot, ensuring it is seated properly to engage the driveshaft.
7. Install the new impeller by rotating the blades in the correct direction (typically clockwise when viewed from above) as you slide it onto the driveshaft.
8. Reassemble the pump housing and cover plate, ensuring all O-rings and gaskets are correctly positioned. Replace worn gaskets as needed.
9. Reattach the lower unit to the mid-section, aligning the driveshaft and water tube carefully. Tighten mounting bolts to factory specifications.
10. Reinstall the propeller and reconnect the fuel line. Check all fasteners for proper torque.
11. Test the cooling system by running the engine in a test tank or on muffs; confirm water flows from the tell-tale indicator within 15 seconds.
12. Inspect for leaks around the pump housing and lower unit seals. Address any issues immediately before normal operation.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Yamaha engine?
A: Check the compatibility table above for your engine model, HP, stroke type, and year range. You can also cross-reference the OEM part number (6L5-44352-00) with your engine's parts diagram or service manual to ensure proper fitment.

Q: How often should I replace my water pump impeller?
A: Yamaha recommends inspecting the impeller annually and replacing it every 2–3 years or 200–300 hours of operation, whichever comes first. Replace immediately if you notice cracked blades, missing pieces, or overheating symptoms.

Q: What are the signs that my impeller is failing?
A: Common symptoms include reduced or no water flow from the tell-tale (pilot hole), engine overheating, steam from the powerhead, or an audible high-temperature alarm. Inspect the impeller immediately if any of these occur.

Q: Does this kit include the key/pin for the driveshaft?
A: Yes, this package includes both the rubber impeller and the key/pin required to secure it to the driveshaft.

Q: Can I install this impeller myself, or do I need a mechanic?
A: If you have basic mechanical skills and the proper tools, you can install this impeller yourself by following the steps in the Installation Guide. However, professional installation is recommended if you are unfamiliar with lower unit disassembly.

Q: Is this an OEM part or an aftermarket replacement?
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.