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

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

This premium-quality water pump impeller is engineered for Yamaha 2-stroke and 4-stroke outboard engines ranging from 8HP to 20HP. Designed to fit Yamaha 2-Stroke 9.9HP and 15HP models (1996 onwards), as well as 4-Stroke T8, T9.9 (April 2007 onwards), F9.9-2, T9.9-2, F15, F15C, and F20 series, this impeller ensures reliable cooling system performance for a wide range of popular Yamaha outboards.

This impeller directly replaces Yamaha OEM part numbers 63V-44352 and 63V-44352-01-00, as well as aftermarket equivalents including Sierra 18-3040 and CEF 500363. Manufactured from high-grade neoprene rubber and hardened nylon for superior marine and chemical corrosion resistance, it delivers consistent water flow and long service life.

• Includes impeller with key/pin for easy installation
• 6-blade design with 53.00mm external diameter and 12.85mm internal shaft diameter
• Compatible with both 2-stroke and 4-stroke Yamaha outboards from 8HP to 20HP

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

Your purchase includes:

• 1 × Neoprene rubber impeller with key/pin

Installation Guide

1. Disconnect the engine's fuel line and ensure it is completely off before beginning work.
2. Remove the lower unit by loosening the mounting bolts and carefully separating it from the mid-section.
3. Locate the water pump housing and remove the pump cover plate screws to access the old impeller.
4. Carefully extract the old impeller, noting the orientation of the blades and key position. Inspect the pump housing for debris or wear.
5. Lubricate the new impeller with water-resistant marine grease or glycerin to ease installation and protect the rubber.
6. Insert the key/pin into the impeller shaft slot, aligning it properly with the drive shaft.
7. Gently rotate the impeller blades in the correct direction (clockwise or counterclockwise, matching original) and slide the impeller into the housing.
8. Reinstall the pump cover plate and secure it evenly with the screws, being careful not to over-tighten.
9. Reattach the lower unit to the mid-section, ensuring all alignment pins and gaskets are properly seated.
10. Reconnect the fuel line and perform a test run with the outboard submerged or using a flushing system. Verify steady water flow from the tell-tale indicator.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Yamaha outboard?
A: Cross-reference your engine's model number and year with the compatibility table above. You can also verify the OEM part number (63V-44352 or 63V-44352-01) in your engine's parts diagram or service manual.

Q: How often should I replace my water pump impeller?
A: Most manufacturers recommend replacing the impeller every 2–3 years or 200–300 hours of operation, whichever comes first. If you notice reduced water flow, overheating, or visible cracks/missing blades, replace immediately.

Q: What are the signs that my impeller is failing?
A: Common symptoms include weak or no water flow from the tell-tale (pilot hole), engine overheating, steam from the cooling system, or visible damage to the impeller blades during inspection.

Q: Can I use this impeller on both 2-stroke and 4-stroke Yamaha engines?
A: Yes, this impeller is compatible with Yamaha 2-stroke 9.9HP and 15HP models (1996+) as well as 4-stroke T8, T9.9, F9.9-2, F15, F15C, and F20 series engines.

Q: Is this an OEM part or an aftermarket replacement?
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.