63V-44352;63V-44352-01 Water Pump Impeller for Yamaha T8 T9.9 F9.9-2 T9.9-2 F15 F15C F20 | JLM Marine

Water Pump Impeller for Yamaha T8 T9.9 F9.9-2 T9.9-2 F15 F15C F20 Outboard Engines

This premium water pump impeller is engineered to fit a comprehensive range of Yamaha outboard engines, including 2-stroke 9.9HP and 15HP models (1996 and later), as well as 4-stroke 8HP, 9.9HP, 15HP, and 20HP engines across the T8, T9.9, F9.9-2, T9.9-2, F15, F15C, and F20 series (2004/2007 onward). Manufactured from high-grade neoprene rubber and hardened nylon, this impeller ensures reliable cooling system performance and long service life.

This aftermarket replacement directly supersedes Yamaha OEM part numbers 63V-44352 and 63V-44352-01-00, as well as Sierra P/N 18-3040 and CEF P/N 500363, providing broad compatibility across multiple part numbering systems.

• 6-blade design with 53.00mm external diameter and 12.85mm internal shaft insert diameter
• Constructed from marine-grade, chemical-corrosion-resistant neoprene rubber and hardened nylon
• Engineered for straightforward installation in lower unit water pump housings

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

This package includes:

• 1 × Outboard Water Pump Impeller (Yamaha 63V-44352-01-00 replacement for 8HP/9.9HP/15HP/20HP engines)

Installation Guide

1. Disconnect the fuel line and remove the engine cowling to access the lower unit.
2. Remove the lower unit by loosening the mounting bolts and carefully sliding it away from the midsection. Take care to catch any residual gear oil.
3. Remove the water pump housing cover by unscrewing the retaining bolts.
4. Extract the old impeller from the pump housing, noting its orientation and the direction of blade rotation.
5. Inspect the pump housing, faceplate, and drive pin for wear, cracks, or corrosion; replace if damaged.
6. Lubricate the new impeller and housing bore with water pump grease or glycerin to ease installation and prevent dry-start damage.
7. Insert the new impeller into the housing, aligning the keyway with the drive pin and ensuring blades curve in the correct direction of rotation.
8. Reinstall the faceplate and water pump housing cover, torquing bolts to manufacturer specifications in a criss-cross pattern.
9. Slide the lower unit back onto the midsection, aligning the driveshaft and water tube carefully.
10. Tighten all lower unit mounting bolts to the specified torque and refill the gearcase with the recommended gear oil.
11. Reconnect the fuel line, reinstall the cowling, and test the engine in a water tank or on-water to confirm proper cooling flow.
12. Inspect for leaks and verify steady water discharge from the tell-tale port during operation.

Troubleshooting & FAQ

How do I confirm this impeller fits my Yamaha engine?
Verify your engine's model number, year, and horsepower against the compatibility table above. Cross-reference your original impeller's OEM part number (63V-44352 or 63V-44352-01-00) to ensure a perfect match. If your model is listed but the physical dimensions differ, do not proceed with installation.

How often should I replace my water pump impeller?
Most manufacturers recommend replacing the impeller every 2–3 years or every 300–400 hours of operation, whichever comes first. If you operate in sandy, silty, or debris-laden water, inspect and replace it more frequently to prevent overheating.

What are the signs my impeller is failing?
Common symptoms include weak or no water flow from the tell-tale (pee-hole), engine overheating, steam from the cowling, or a high-temperature alarm. Inspect the impeller immediately if you notice reduced cooling performance.

Can I install this impeller myself, or do I need a professional?
If you have basic mechanical skills and the proper tools, DIY installation is possible by following the steps above. However, professional installation is recommended to ensure proper alignment, torque specifications, and to avoid damage to seals or the water tube.

Will this impeller work if my engine runs in saltwater?
Yes, this impeller is constructed from marine-grade neoprene rubber and hardened nylon that resist saltwater corrosion. Always flush your cooling system with fresh water after saltwater use to maximize impeller lifespan.

What's the difference between this aftermarket impeller and the Yamaha OEM part?
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.