Water Pump Impeller – Fits Yamaha 9.9-15 HP Outboard (Replaces 63V-44352-01-00)

Water Pump Impeller – Fits Yamaha 9.9-15 HP Outboard (Replaces 63V-44352-01-00)

This water pump impeller is designed to fit a wide range of Yamaha two-stroke and four-stroke outboard motors from 9.9 HP to 15 HP, manufactured between 1984 and 2015. It also fits select Mercury/Mariner 9.9C and 15C models.

Engineered as a direct replacement for multiple OEM part numbers, this component ensures reliable raw water circulation to prevent engine overheating. It is a crucial part of the lower unit cooling system.

• Material: Constructed from durable neoprene rubber with a hardened nylon hub for longevity and performance.
• Installation: Installs inside the lower unit water pump housing.
• Blades: Features a 6-blade design for efficient 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.

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.

Technical Specifications

Package Contents

• 1 x Impeller (Replaces 63V-44352-01-00)

Explosion Diagram

Installation Guide

1. Safety First: Shift the outboard motor into neutral and disconnect the battery.
2. Access Lower Unit: Remove the bolts securing the lower unit (gearcase) to the engine's midsection and carefully lower it.
3. Open Pump Housing: Locate the water pump assembly on top of the lower unit and unbolt the housing cover.
4. Remove Old Impeller: Slide the housing cover up the driveshaft to expose the impeller. Make a note of the vane direction and remove the old impeller and its key.
5. Inspect Components: Clean and inspect the housing, wear plate, and gaskets for cracks, scoring, or warping. Replace if damaged.
6. Install New Impeller: Fit the new key into the driveshaft slot. Slide the new impeller onto the shaft.
7. Seat Impeller: Lightly lubricate the inside of the housing with grease or soapy water. Lower the housing over the impeller while turning the driveshaft clockwise to ensure the vanes bend correctly.
8. Secure Housing: Fasten the housing bolts to the manufacturer-specified torque.
9. Reinstall Lower Unit: Carefully guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align properly. Secure the mounting bolts.
10. Test Operation: Reconnect the battery. With the outboard in water or connected to a flush device, start the engine and verify a steady water stream from the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?

A: First, check the detailed "Compatible Engine Models" table to see if your model, horsepower, and year range are listed. This impeller directly replaces Yamaha part numbers 63V-44352-01-00, 63V-44352-02-00, and 63V-44352-00-00 as well as Mercury/Mariner numbers 47-84027M, 47-84027T, and 47-96619M. Cross-referencing these part numbers is the most reliable way to ensure a correct fit.

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

A: For preventative maintenance, it is best practice to replace the impeller annually or every 100 hours of operation, whichever comes first. This helps prevent unexpected failure and potential engine overheating.

Q: What are the signs of a failing impeller?

A: A weak, inconsistent, or non-existent water stream from the "telltale" indicator outlet is the most common sign. Other indicators can include an engine overheating alarm or steam coming from the exhaust. If you notice any of these symptoms, inspect the impeller immediately.

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.