Water Pump Impeller – Fits Yamaha 6HP & 8HP Outboard Motors (Replaces 6G1-44352-00-00)

Water Pump Impeller – Fits Yamaha 6HP & 8HP Outboard Motors

This water pump impeller is designed for select Yamaha 2-Stroke 6 HP and 8 HP outboard motors (1984–2009) and specific Mercury/Mariner 6 HP and 8 HP 2-Stroke models. It serves as a direct-fit replacement, ensuring your engine’s cooling system functions efficiently.

Engineered to meet OEM specifications, this component is a reliable alternative to original manufacturer parts, providing a cost-effective solution for routine maintenance or repairs. Please verify compatibility using the detailed model lists and part numbers below.

• Installation Method: Direct replacement that requires disassembly of the water pump housing.
• Material: Constructed from high-quality Neoprene/Chloroprene Rubber (CR) for durability and performance in marine environments.
• Blades: Features 6 blades, matching OEM 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.

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Yamaha 2-Stroke Outboard

Mercury/Mariner Outboard

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (6G1-44352-00-00)

Installation Guide

Professional installation is recommended. The following are generic steps and may not fully represent the process for your specific engine model.

1. Safety First: Disconnect the battery and remove the spark plug leads.
2. Access the Lower Unit: Position the engine securely and drain the gearcase oil.
3. Remove Lower Unit: Unbolt and carefully detach the lower unit (gearcase) from the upper engine leg.
4. Disassemble Pump Housing: Locate and unbolt the water pump housing to expose the impeller.
5. Inspect and Remove Old Impeller: Note the rotational direction of the old impeller blades before pulling it off the driveshaft. Remove the Woodruff key if present.
6. Clean and Prepare: Thoroughly clean the inside of the pump housing and inspect it for scoring, cracks, or warping. Replace the housing if significant wear is found.
7. Install New Impeller: Lightly lubricate the new impeller and housing. Install the Woodruff key, then slide the new impeller onto the driveshaft, twisting it in the direction of engine rotation.
8. Reassemble: Reinstall the pump housing with a new gasket, ensuring all bolts are torqued to the manufacturer's specification.
9. Reattach Lower Unit: Reinstall the lower unit, ensuring the driveshaft and shifter shaft align correctly.
10. Finalize: Refill the gearcase with fresh oil, reconnect spark plug leads and the battery, and start the engine to test for proper water circulation from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Yamaha or Mercury engine?

A: Check the "Compatible Engine Models" tables on this page to ensure your specific HP, model, and year (for Yamaha) or serial number prefix (for Mercury) is listed. Cross-referencing the OEM part number (6G1-44352-00-00 or 47-11590M) is the best way to guarantee a match.

Q: What are the signs that my water pump impeller needs to be replaced?

A: Common indicators include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, or a noticeable drop in cooling performance. Visual inspection may reveal cracked, brittle, or worn blades.

Q: How often should I replace the water pump impeller?

A: For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or 100-200 hours of operation. The interval may be shorter if operating frequently in sandy, silty, or saltwater conditions.

Q: OEM vs. Aftermarket?

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.