Water Pump Repair Kit – Fits Yamaha F30, F40 Outboard Motors (Replaces 6BG-W0078-00-00)

Water Pump Repair Kit – Fits Yamaha F30, F40 Outboard Motors (Replaces 6BG-W0078-00-00)

This water pump repair kit provides a complete solution for servicing the cooling system on a range of Yamaha outboard motors. It is designed to fit 4-stroke models from 30 to 40 HP, including F30, F40, and T25 variants manufactured between 2008 and 2017.

This kit is a direct replacement for Yamaha part numbers 6BG-W0078-00-00 and 6BG-W0078-01-00, as well as Sierra aftermarket part 18-3490.

• Engineered as a direct OEM-spec replacement for straightforward installation.
• Restores cooling system performance to prevent engine overheating.
• Includes a new impeller, housing, gaskets, plate, and hardware for a comprehensive 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 Pump Housing Cover (63D-44312-00-00)
• 1 x Water Pump Gasket (63D-44316-00-00)
• 1 x Insert Cartridge (63D-44322-00-00)
• 1 x Outer Plate, Cartridge (63D-44323-00-00/66T-44323-00-00)
• 1 x Damper, Water Seal 2 (663-44366-00-00)
• 1 x Impeller (6H4-44352-02-00)
• 4 x Bolt, With Washer (90119-08M15-00)
• 1 x Key, Woodruff (90280-03M03-00)
• 1 x O-Ring (93210-59MG7-00)

Installation Guide

1. Disconnect the battery and shift linkage before beginning work.
2. Unbolt and carefully remove the lower unit from the outboard motor.
3. Remove the bolts securing the water pump housing to access the old components.
4. Slide the old pump housing, impeller, and gaskets off the driveshaft, noting their orientation.
5. Thoroughly clean the mounting surfaces to remove any old gasket material or corrosion.
6. Install the new Woodruff key into the driveshaft, followed by the new gaskets and insert cartridge.
7. Slide the new impeller onto the driveshaft. Rotate it clockwise while pushing down to seat the vanes correctly inside the housing.
8. Install the new pump housing and outer plate, then secure them with the new bolts provided in the kit.
9. Carefully reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
10. Reconnect the shift linkage and battery. Test the engine in water to confirm a strong, steady stream from the cooling system's tell-tale outlet.

Troubleshooting & FAQ

How can I be sure this kit fits my Yamaha F40?

This kit is designed for Yamaha F40 models from 2008–2017. To confirm, check the "Compatible Engine Models" table and match your specific model (e.g., F40TLR) and year. Cross-referencing your old part number with 6BG-W0078-00-00 or 6BG-W0078-01-00 is the best way to ensure an exact match.

What are the signs that my water pump needs to be replaced?

Common signs include the engine overheating at idle or low speeds, a weak or inconsistent stream of water from the tell-tale outlet, or visible damage (cracked or brittle vanes) on the old impeller during a physical inspection.

How often should the water pump impeller be replaced?

As a general maintenance guideline, it is recommended to inspect the impeller annually and replace the kit every 1-2 years or 100-200 hours of use, depending on operating conditions (e.g., frequent use in saltwater or sandy/silty water).

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.