Water Pump Impeller Repair Kit – Fits Yamaha F4/F5/F6 4-Stroke Outboards (Replaces 6BX-WG078-00-00)

Water Pump Impeller Repair Kit – Fits Yamaha F4/F5/F6 4-Stroke Outboards (Replaces 6BX-WG078-00-00)

This water pump impeller repair kit provides all the necessary components for servicing the water pump on Yamaha 4-6 HP 4-stroke outboard engines from 2010 and newer. It is designed to fit models including F4BMH, F4LMH, F4SMH, F5AMH, F5LMH, F5SMH, F6CMH, F6LMH, and F6SMH.

This assembly is a direct replacement for multiple Yamaha and aftermarket part numbers, ensuring comprehensive compatibility and restoring your engine's cooling system to factory specifications.

• Direct Replacement: Engineered to meet or exceed OEM specifications for a perfect fit and reliable performance.
• Complete Kit: Includes the impeller, housing, gaskets, plates, and all other necessary hardware for a full replacement.
• Quality Manufacturing: Produced in an ISO9002 certified facility to ensure consistent quality and durability.

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 kit includes all components required for a complete water pump overhaul. Note: Yamaha has superseded the original kit multiple times. This aftermarket kit is based on the most current OEM version (6EE-W0078-02-00) and may differ from the contents of older kits.

• 1 x Gasket, Water Pump (60X-44315-A0-00)
• 1 x Outer Plate, Cartridge (60X-44323-00-00)
• 1 x Insert, Cartridge (61A-44322-02-00)
• 1 x Impeller (6E5-44352-01-00)
• 4 x Bolt, W/ Washer (90119-08M14-00)
• 1 x Key, Woodruff (90280-04M05-00)
• 1 x O-Ring (93210-37M67-00)
• 1 x O-Ring (93210-86M38-00)
• 2 x Pin, Dowel (93606-12019-00)

Installation Guide

Follow these general steps to replace your water pump kit. Always refer to your engine's specific service manual for detailed instructions.

1. Disconnect the battery and remove the engine cover.
2. Place a drain pan under the lower unit and remove the gearcase oil drain screw to empty the oil.
3. Remove the bolts connecting the lower unit (gearcase) to the upper driveshaft housing.
4. Carefully lower the gearcase away from the engine.
5. Unbolt and remove the old water pump housing to access the impeller and other components.
6. Clean all mating surfaces thoroughly, removing any old gasket material.
7. Install the new impeller, key, gaskets, plates, and housing from the kit. Ensure the impeller vanes are facing the correct direction.
8. Re-install the water pump assembly and torque the bolts to the manufacturer's specification.
9. Raise the lower unit back into position and secure it with the mounting bolts.
10. Refill the gearcase with fresh marine gear lube and reinstall the drain screw with a new gasket.
11. Start the engine in the water or with a flush attachment to verify proper water flow from the tell-tale port.

Troubleshooting & FAQ

How do I confirm this fits my Yamaha F6 engine?
This kit is designed for Yamaha F6 models (F6CMH, F6LMH, F6SMH) made in 2010 and newer. The best way to confirm is to check your engine's model and year against the "Compatible Engine Models" table. You can also compare your existing part numbers to those in the "Part Number Cross-Reference" section.

What are the signs of a bad water pump impeller?
Common symptoms include the engine overheating at idle or low speeds, or a weak or non-existent stream of water from the "tell-tale" outlet port. A brittle, cracked, or worn impeller can no longer pump water effectively, leading to poor engine cooling.

How often should I replace the water pump impeller?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions. More frequent replacement may be necessary if you operate in sandy, silty, or saltwater environments.

What is the difference between this kit and the original Yamaha kit?
This is an aftermarket kit manufactured to the same specifications as the OEM part. The main difference is that OEM part numbers have been updated over time (from 6BX-WG078-00-00 to 6EE-W0078-02-00). Our kit's contents match the latest version to ensure compatibility and performance.

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.