6F5-44352-00 Water Pump Impeller for Yamaha C40 CV40 | JLM Marine

Water Pump Impeller 6F5-44352-00 – Fits Yamaha 2-Stroke 40 HP C40 & CV40 Outboards

This aftermarket water pump impeller is engineered for Yamaha 2-stroke 40 HP outboard motors, specifically the C40 (1991–1997) and CV40 (1990) series. Designed to meet OEM specifications, it ensures reliable cooling system performance and straightforward replacement.

This impeller directly replaces Yamaha OEM part numbers 6F5-44352-00, 6F5-44352-01, 6F5-44352-03, and 676-44352-00, as well as aftermarket equivalents from CEF Marine, Sierra Marine, and Mallory Marine.

• Package includes: 1× Water Pump Impeller
• Features 6 blades constructed from high-performance neoprene rubber
• Suitable for Yamaha 2-stroke 2-cylinder 40 HP models from 1990–1997

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:

• 1× Water Pump Impeller

Installation Guide

1. Disconnect the fuel line and ensure the engine is off and cool.
2. Remove the lower unit from the engine housing following your service manual's instructions.
3. Locate the water pump housing on the lower unit. Remove the retaining bolts and lift off the housing cover.
4. Extract the old impeller by gently pulling it straight out of the housing. Inspect for damage or debris.
5. Clean the pump housing and shaft thoroughly to remove old gasket material, corrosion, or contaminants.
6. Lubricate the new impeller blades with marine grease or soapy water to ease installation.
7. Insert the new impeller into the housing, ensuring the blades face the correct rotation direction (refer to arrows or manual).
8. Position the impeller on the drive shaft, aligning the keyway or slot carefully.
9. Reinstall the pump housing cover with a new gasket, tightening bolts to the specified torque in a cross pattern.
10. Reattach the lower unit to the engine, ensuring proper alignment and secure fastening.
11. Reconnect the fuel line and perform a water flush test to confirm coolant flow and check for leaks.
12. Run the engine briefly in a test tank or on-water to verify normal operating temperature and water discharge.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Yamaha engine?
A: Cross-reference your engine's model number and year with the compatibility table above. You can also check your original impeller's OEM part number against the part number cross-reference provided. If your model is listed and the part numbers match, this impeller will fit.

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 overheating, reduced water flow, or visible blade damage.

Q: What are the signs of a failing impeller?
A: Common symptoms include engine overheating, weak or no water stream from the tell-tale (indicator), steam from the engine, or reduced performance. Inspect the impeller if any of these occur.

Q: Can I install this impeller myself, or do I need a mechanic?
A: If you have basic mechanical skills and tools, you can replace the impeller following the installation guide and your engine's service manual. However, professional installation is recommended to ensure proper fitment and avoid damage.

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.