Water Pump Impeller Repair Kit – Fits Yamaha 6-15 HP Outboards (Replaces 68T-W0078-00-00, 68T-W0078-01-00)

Water Pump Impeller Repair Kit – Fits Yamaha 6-15 HP Outboards

This water pump impeller repair kit is designed for a range of Yamaha 4-stroke outboards from 6 HP to 15 HP (model years 2000–2015). It provides a reliable, direct-fit replacement for essential lower unit cooling system components.

This kit serves as an aftermarket replacement for Yamaha OEM part numbers 68T-W0078-00-00, 68T-W0078-01-00, and 68T-W0078-02-00.

• Installation Type: Direct OEM-spec replacement.
• Core Components: Includes CR-Neoprene impeller, 316 stainless steel wear plate, and nylon housing.
• Primary Function: Restores cooling system performance by replacing worn or damaged water pump components.

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 Water Pump Impeller (68T-44352-00-00)
• 1 x Woodruff Key (63V-44338-00-00)
• 1 x Cartridge Insert (68T-44322-00-00)
• 1 x Cartridge Outer Plate (68T-44323-00-00)
• 1 x Water Seal Damper (68T-44366-00-00)
• 1 x O-Ring (93210-44398-00)
• 4 x Bolts (97095-08045-00)
• 1 x Water Pump Housing (63V-44301-00-00)

Installation Guide

1. Disconnect the battery and shift the engine into neutral.
2. Drain the lower unit gearcase oil into a suitable container.
3. Remove the propeller assembly.
4. Unbolt and carefully lower the gearcase from the upper driveshaft housing.
5. Remove the bolts securing the water pump housing cover.
6. Take off the old impeller, wear plate, seals, and gaskets. Note their orientation.
7. Clean all mating surfaces thoroughly, removing any old gasket material or corrosion.
8. Install the new cartridge, wear plate, seals, and Woodruff key.
9. Slide the new impeller onto the driveshaft, turning it clockwise to seat the vanes correctly.
10. Re-install the water pump housing and tighten the bolts to the manufacturer's specified torque.
11. Raise the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly, then secure it.
12. Refill the gearcase with fresh oil and test the engine's cooling system using a water supply ("muffs").

Troubleshooting & FAQ

How do I confirm this kit fits my specific Yamaha engine?
First, check your engine's details against the "Compatible Engine Models" table. It is crucial to match the model, horsepower, and year range. For confirmation, use the provided Yamaha Serial Number Guide to verify your exact model and serial number, as fitment can vary between specific versions, especially for newer engines.

Does this kit include the water pump housing?
Yes, this is a complete kit that includes the Water Pump Housing (63V-44301-00-00). Please review the "Package Contents" list for a full breakdown of all included components.

How often should I replace my water pump impeller?
As a general maintenance rule, you should inspect the impeller annually and plan to replace it every 1-2 years or every 100-200 hours of operation. Service intervals should be shorter if you frequently operate in saltwater or debris-heavy water.

What are the signs of a failing water pump?
Common symptoms include the engine overheating at idle or low speeds, a weak or intermittent water stream from the "telltale" outlet, or a high-pitched whining sound from the lower unit. On inspection, a worn impeller will have brittle, cracked, or deformed vanes.

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.