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

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

This water pump impeller is designed for a precise fit on a range of Yamaha and Mercury/Mariner 2-stroke outboard motors. It is compatible with Yamaha 6HP and 8HP models from 1984 to 2009, as well as Mercury/Mariner 6HP (6C, 6D) and 8HP (8C) series engines.

Engineered as a direct replacement for the original component, this impeller ensures reliable performance for your cooling system. It is cross-compatible with multiple OEM and aftermarket part numbers, facilitating a straightforward replacement process.

• Material: High-strength Neoprene (CR) rubber for durability and longevity.
• Included Component: Contains one water pump impeller.
• Installation: Requires disassembly of the water pump housing.

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.

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 (Replaces OEM 6G1-44352-00-00)

Explosion Diagram

Installation Guide

1. Safety First: Disconnect the engine's battery and remove the spark plug wires to prevent accidental starting.
2. Access the Lower Unit: Remove the bolts securing the gearcase (lower unit) to the engine's midsection and carefully lower it.
3. Open Water Pump Housing: Locate the water pump assembly on top of the gearcase. Unscrew the bolts to remove the housing cover.
4. Remove Old Impeller: Take note of the blade orientation. Pull the old impeller straight off the driveshaft. A key or pin may also need to be removed.
5. Clean and Inspect: Thoroughly clean the inside of the housing and the wear plate. Check for scoring, warping, or corrosion and replace if necessary.
6. Install New Impeller: Slide the new impeller onto the driveshaft. While pushing down, turn the driveshaft clockwise to help bend the blades in the correct direction.
7. Reassemble Housing: Apply a light coat of marine grease to the inside of the housing and reinstall the cover, tightening the bolts to the manufacturer's specified torque.
8. Reattach Lower Unit: Carefully guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly. Secure with bolts.
9. Test Operation: Reconnect the battery and spark plugs. Start the engine in a test tank or with a water flusher to confirm the cooling system is pumping water.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: The best method is to compare your existing part's specifications and appearance with the images and data provided here. Check the compatible model tables and cross-reference your part number. When in doubt, use the linked guides to find your engine's model or serial number to be certain.

Q: What are the signs of a failing water pump impeller?
A: A weak or no water stream from the "tell-tale" port is the most common sign. Other indicators include engine overheating alarms, a hot-to-the-touch engine exterior, or reduced engine performance.

Q: How often should I replace the impeller?
A: For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years, depending on usage (hours) and operating conditions (saltwater vs. freshwater). An impeller can fail from age and disuse, not just from high hours.

Q: Is it necessary to buy a full water pump repair kit?
A: While this listing is for the impeller only, a full kit (which includes the housing, gaskets, and wear plate) is recommended if the existing housing shows signs of warping, scoring, or corrosion, as this can cause premature failure of a new impeller.

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.