Water Pump Impeller Repair Kit – Fits Yamaha F40/F70 4-Stroke (Replaces 6CJ-W0078-00/6CJ-W0078-01-00)

Water Pump Impeller Repair Kit – Fits Yamaha F40/F70 4-Stroke (Replaces 6CJ-W0078-00/6CJ-W0078-01-00)

This is a complete water pump impeller repair kit designed for Yamaha F40 (2011–2016) and F70 (2011–2016) 4-stroke outboard engines. It provides a reliable solution for maintaining your engine's cooling system.

This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring broad compatibility for the specified engine models. All components meet or exceed OEM specifications for a perfect fit and dependable performance.

• Direct Installation: Manufactured to OEM specifications for a direct, hassle-free replacement of your existing water pump components.
• Durable Materials: Features a premium rubber impeller for optimal flexibility and longevity, along with stainless steel hardware to resist corrosion in marine environments.
• Comprehensive Kit: Includes all necessary components for a full water pump rebuild, from the impeller and housing to gaskets, seals, and bolts.

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

The complete water pump repair kit includes:

• 1 x Water Pump Impeller (Replaces 6CJ-W0078-00-00)
• 1 x Housing Cover
• 1 x Impeller Key
• 1 x O-ring
• 1 x Oil Seal
• 1 x Wear Plate
• 1 x Water Seal Damper
• 1 x Set of Water Pump Gaskets
• 1 x Pin
• 1 x Set of Bolts and Washers

Installation Guide

1. Prepare the Engine: Ensure the engine is turned off and disconnect the battery cables. Place the outboard in a secure, upright position.
2. Access the Water Pump: Remove the lower unit (gearcase) from the outboard by unbolting it from the upper casing.
3. Disassemble the Pump: Carefully unbolt and remove the water pump housing to expose the impeller and other components. Note the order of disassembly.
4. Remove Old Components: Take out the old impeller, wear plate, key, gaskets, and seals. Clean any debris or corrosion from the housing and driveshaft area.
5. Install New Components: Install the new wear plate, gasket, and impeller key. Slide the new impeller onto the driveshaft, rotating it in the direction of engine operation to set the vanes correctly.
6. Reassemble the Pump: Place the new housing, seals, and gaskets over the impeller and bolt it down securely according to your service manual's torque specifications.
7. Reattach Lower Unit: Reinstall the lower unit to the outboard, ensuring the driveshaft and water tube align correctly.
8. Test Operation: Reconnect the battery, supply water to the engine using a flush device, and start it. Check for a strong, steady stream from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
Verify your engine is a Yamaha F40 (models 6CY1 to 6CY7) or F70 (models 6CJ1 to 6CJ7) from the years 2011–2016. You can also cross-reference your existing part number with the OEM numbers 6CJ-W0078-00-00 or 6CJ-W0078-01-00.

What are the signs that my water pump impeller needs replacement?
Common signs include the engine overheating at idle or low speeds, a weak or non-existent water stream from the tell-tale outlet, or visible damage such as cracked, brittle, or missing vanes on the impeller upon inspection.

How often should I replace the water pump impeller?
For optimal engine protection, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, whichever comes first. Usage in saltwater or silty/sandy water may require more frequent replacement.

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.