Water Pump Impeller – Fits Yamaha F300A/F350A V8 Outboards (Replaces 6AW-44352-00-00)

Water Pump Impeller – Fits Yamaha F300A/F350A V8 Outboards (Replaces 6AW-44352-00-00)

This water pump impeller is designed for Yamaha F300A/F350A 5.3L V8 4-Stroke outboard engines from 2006 and newer. It serves as a direct-fit replacement, ensuring proper cooling system function and engine protection.

Replaces the following part numbers: Yamaha 6AW-44352-00-00, Sierra CEF500389N, and JLM Marine 6AW-44352-00-00.

• Installation Method: Direct OEM Replacement
• Material: High-durability neoprene for reliable performance in marine environments.
• Package includes one water pump impeller.

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

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

Note: This part is a standalone component. It is also included in the complete Water Pump Repair Kit 6AW-W0078-00-00. If you require the full kit with housing, gaskets, and hardware, please verify you are purchasing the correct item. The full kit typically includes:

• 1 x Insert, Cartridge (6AW-44322-00-00)
• 1 x O-Ring (93210-94003-00)
• 1 x O-Ring (93210-37M67-00)
• 1 x Impeller (6AW-44352-00-00)
• 1 x Key (6AW-44336-00-00)
• 1 x Outer Plate, Cartridge (6AW-44323-00-00)
• 1 x Gasket, Water Pump (6AW-44315-00-00)
• 2 x Pin, Dowel (93606-12019-00)
• 4 x Bolt, With Washer (90119-08M14-00)

Installation Guide

For a safe and effective replacement, follow these general steps. Always refer to your engine's specific service manual for detailed instructions and torque specifications.

1. Disconnect Power: Disconnect the negative battery cable to prevent accidental starting.
2. Remove Lower Unit: Drain the gearcase lubricant and unbolt the lower unit (gearcase) from the outboard's midsection. Be prepared for it to be heavy.
3. Access the Pump: Place the lower unit on a workbench and remove the bolts securing the water pump housing.
4. Inspect & Remove Old Impeller: Lift the housing off. Note the rotational direction of the old impeller's fins. Remove the impeller, wear plate, gaskets, and woodruff key.
5. Clean Surfaces: Thoroughly clean all residue from the housing interior and the driveshaft.
6. Install New Impeller: Install the new woodruff key, gaskets, and wear plate. Lubricate the inside of the new pump housing with a marine-grade lubricant. Slide the new impeller onto the driveshaft while turning the shaft in its normal rotational direction to bend the blades correctly.
7. Reassemble Pump: Reinstall the pump housing and tighten the bolts to the manufacturer's specified torque.
8. Reinstall Lower Unit: Guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly. Bolt it securely.
9. Final Checks: Refill the gearcase with fresh lubricant. Reconnect the battery. Start the engine using a flush-out device or in the water and verify a strong, steady stream from the telltale port.

Troubleshooting & FAQ

How do I confirm this impeller fits my engine?
The most reliable method is to match your existing part number to 6AW-44352-00-00. You can also use the comprehensive "Compatible Engine Models" table on this page to find your specific Yamaha model, year, and HP. For additional verification, we recommend using the Yamaha Serial Number Guide linked above.

What are the signs of a failing water pump impeller?
Common symptoms include a weak or no water stream from the engine's "telltale" indicator, engine overheating alarms, or a reduction in engine power. A damaged impeller cannot effectively cool the engine, leading to serious damage if ignored.

How often should I replace the impeller?
As a critical preventative maintenance item, we recommend replacing the water pump impeller annually or every 100-300 hours of use, whichever comes first. This helps prevent unexpected failures due to material fatigue from age and use.

Is this the complete repair kit or just the impeller?
This listing is for the standalone impeller only (part number 6AW-44352-00-00). If you need the housing, gaskets, O-rings, and other hardware, search for the complete Water Pump Repair Kit (part number 6AW-W0078-00-00).

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.