6G1-44352 Water Pump Impeller for Yamaha | JLM Marine

Water Pump Impeller – Fits Yamaha 2-Stroke 6/8 HP Outboard Motors

This premium aftermarket water pump impeller is engineered for Yamaha 2-stroke outboard motors, specifically the 6 HP (2-cylinder, 1986–2000) and 8 HP (2-cylinder, 1984–2019) models. Designed to meet OEM specifications, it ensures reliable cooling system performance and protects your engine from overheating.

This impeller directly replaces Yamaha OEM part number 6G1-44352-00-00 and crosses with multiple aftermarket brands including GLM Marine 89870, CEF Marine 500302, Sierra 18-3066, and Mallory 9-45610, providing broad compatibility and easy sourcing.

• Includes impeller with drive key/pin for complete installation
• Compatible with Yamaha 2-stroke 6 HP and 8 HP outboards
• Precision-engineered 6-blade design for optimal water flow

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

• Outboard Rubber Impeller with Key / Pin

Installation Guide

1. Disconnect the fuel line and ensure the engine is off and cool before starting work.
2. Remove the lower unit from the outboard motor following your service manual instructions.
3. Locate and remove the water pump housing cover by unscrewing the retaining bolts.
4. Carefully extract the old impeller from the pump housing, noting the direction of blade rotation.
5. Clean the pump housing thoroughly, removing any debris, old gasket material, or corrosion.
6. Lubricate the new impeller blades with glycerin, soapy water, or marine-grade grease (never petroleum-based products).
7. Insert the drive key/pin into the impeller hub slot, ensuring it is properly seated.
8. Install the new impeller into the housing, rotating the blades in the correct direction as marked or observed during removal.
9. Replace the pump housing gasket and ensure all sealing surfaces are clean and properly aligned.
10. Reinstall the water pump cover and torque bolts to manufacturer specifications.
11. Reattach the lower unit to the outboard, checking all fasteners and connections.
12. Test the cooling system by running the engine in a test tank or on muffs, verifying strong water flow from the telltale port.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Yamaha outboard?
A: Check the Compatible Engine Models table above to verify your engine's HP, stroke type, and year range. You can also cross-reference your original Yamaha part number (6G1-44352-00-00) with the Part Number Cross-Reference table to ensure compatibility.

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 you notice overheating, reduced water flow from the telltale, or visible cracks/wear on the impeller blades, replace it immediately regardless of service interval.

Q: What are the signs of a failing water pump impeller?
A: Common symptoms include engine overheating, weak or no water discharge from the telltale (indicator stream), steam from the engine, or an audible high-temperature alarm. If you experience any of these, shut down the engine immediately and inspect the impeller.

Q: Can I use petroleum-based grease when installing this impeller?
A: No, never use petroleum-based lubricants as they will damage the neoprene rubber and cause premature failure. Use only glycerin, soapy water, or dedicated marine water pump grease during installation.

Q: What is the difference between this aftermarket impeller and the OEM Yamaha part?
A: This is an aftermarket replacement part built to OEM specifications using comparable hardened nylon and neoprene rubber materials. It is manufactured in an ISO9002-certified facility with rigorous quality control to ensure performance equivalent to the original Yamaha part at a more competitive price point.

Q: Is this an OEM or aftermarket part?
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.