Water Pump Impeller Kit – Fits Yamaha 9.9-30HP 4-Stroke Outboards (Replaces 61N-W0078-11-00)

Water Pump Impeller Kit – Fits Yamaha 9.9-30HP 4-Stroke Outboards (Replaces 61N-W0078-11-00)

This water pump repair kit is designed for Yamaha 4-stroke outboard motors in the 9.9HP to 30HP range. It is a direct-fit replacement for F25 models and is also compatible with other engines in this series, ensuring reliable performance for your cooling system.

This kit serves as a direct replacement for Yamaha part number 61N-W0078-11-00 and Sierra Marine part number 18-3432.

• Installation Location: Installs in the lower unit (gearcase) of the outboard.
• Fitment Type: Direct fit, built to meet or exceed original equipment specifications.
• Complete Kit: Includes the impeller, housing, plate, gaskets, and all necessary hardware for a full service.

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 Cartridge Insert (63V-44322-00-00)
• 1 x Water Seal Damper 3 (6L2-44367-00-00)
• 1 x Impeller (63V-44352-01-00)
• 1 x Woodruff Key (664-44338-00-00)
• 1 x O-Ring (93210-49046-00)
• 1 x Cartridge Outer Plate (68T-44323-00-00)
• 2 x Dowel Pins (93604-10M03-00)
• 4 x Bolts (97095-08045-00)
• 2 x Plates (63V-44328-01-00)

Installation Guide

1. Safety First: Disconnect the battery and remove the propeller before beginning work.
2. Drain Oil: Drain the gearcase oil into a suitable container.
3. Remove Lower Unit: Unbolt and carefully detach the lower unit (gearcase) from the upper engine casing.
4. Access Pump Housing: Locate and unbolt the water pump housing to expose the old impeller and components.
5. Inspect and Clean: Clean the housing interior and inspect for any scoring or damage.
6. Install New Parts: Install the new plates, O-ring, impeller (turn driveshaft clockwise to set vanes), and other components from the kit.
7. Reassemble: Secure the pump housing, apply sealant to the bolts, and torque to the manufacturer's specifications.
8. Reattach Lower Unit: Reinstall the lower unit, ensuring the driveshaft and shift shaft are correctly aligned.
9. Refill Oil: Refill the gearcase with fresh marine gear lubricant.
10. Test Operation: Reconnect the battery, start the engine in water, and confirm a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
First, check the "Compatible Engine Models" table on this page. For Yamaha engines, the best way to confirm is by using your engine's model and serial number. We provide a link to a Yamaha Serial Number Guide to help you find this information.

What are the signs my water pump impeller needs replacing?
Common signs of a failing impeller include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, or a noticeable decrease in engine performance. Visible cracks, missing vanes, or brittleness on the old impeller during inspection also indicate it's time for replacement.

How often should I replace the water pump kit?
For preventative maintenance, it is recommended to inspect the impeller annually and replace the entire water pump kit every 1-2 years or every 100-200 hours of use, depending on operating 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.