Water Pump Impeller – Fits Yamaha 8–20 HP 2 & 4 Stroke Outboards (Replaces 63V-44352-01-00)

Water Pump Impeller – Fits Yamaha 8–20 HP 2 & 4 Stroke Outboards (Replaces 63V-44352-01-00)

This water pump impeller is a direct-fit replacement for a range of Yamaha 2-stroke (9.9–15 HP) and 4-stroke (8–20 HP) outboard motors. It is engineered to meet or exceed OEM specifications for reliable cooling performance.

This component directly replaces Yamaha part numbers 63V-44352-00-00 and 63V-44352-01-00, as well as aftermarket parts from Sierra, Mallory, GLM Marine, SEI Marine, Red Rhino, and CEF.

• Installation Type: Direct Replacement
• Material: High-strength, flexible rubber/neoprene compound
• Included in Package: 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.

Yamaha 2-Stroke Outboards

Yamaha 4-Stroke Outboards

Technical Specifications

Package Contents

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

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is off and in a safe, stable position before starting any work.
2. Access the Lower Unit: Locate and remove the bolts securing the lower unit (gearcase) to the upper part of the outboard.
3. Separate the Lower Unit: Gently separate the lower unit from the engine. Be mindful of the shift shaft, which may need to be disconnected.
4. Open Water Pump Housing: Locate the water pump housing on top of the lower unit. Remove the bolts securing its cover.
5. Remove Old Impeller: Lift the housing cover and carefully remove the old impeller. Note the direction of the old blades for reference.
6. Clean and Inspect: Clean the inside of the housing and the wear plate. Check for scoring, warping, or corrosion and replace if necessary.
7. Install New Impeller: Lightly lubricate the inside of the housing. Install the new impeller by pushing down while turning the driveshaft clockwise to bend the blades correctly.
8. Reassemble Housing: Replace the housing cover and tighten the bolts to the manufacturer's specified torque.
9. Reattach Lower Unit: Carefully guide the lower unit back into place, ensuring the driveshaft, water tube, and shift shaft align properly. Secure with bolts.
10. Test Operation: Reconnect the battery. Start the engine using a water supply (flushing muffs) and check for a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this impeller fits my engine?
First, check the "Compatible Engine Models" table on this page. For Yamaha owners, we recommend using the Yamaha Serial Number Guide to confirm your engine's model and year precisely. Cross-referencing the part number from your old impeller is also a reliable method.

What are the signs of a failing water pump impeller?
The most common symptoms include engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, and in some cases, a melted water pump housing due to excessive heat.

How often should I replace the water pump impeller?
As a preventative maintenance measure, we recommend replacing the impeller every 1–2 years or every 100–200 hours of operation, whichever comes first. This interval can vary based on usage conditions (e.g., saltwater vs. freshwater).

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.