Water Pump Repair Kit – Fits Yamaha F30/F40 4-Stroke Outboards (Replaces 6BG-W0078-00-00)

Water Pump Repair Kit – Fits Yamaha F30/F40 4-Stroke Outboards (Replaces 6BG-W0078-00-00)

This water pump repair kit provides all the necessary components to restore the cooling system on Yamaha F30 (2013–2022) and F40 (2009–2022) 4-stroke outboard engines. It is engineered to meet or exceed original equipment specifications for a reliable fit and optimal performance.

This kit is a direct replacement for Yamaha part numbers 6BG-W0078-00-00 and the superseded version 6BG-W0078-01-00.

• Complete Service Kit: Includes a new impeller, housing, gaskets, plates, and hardware required for a full water pump rebuild.
• Direct Replacement Fit: Designed for straightforward installation without the need for modifications.

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 Cartridge Outer Plate (63D-44323-00-00)
• 1 x Water Seal Damper 2 (663-44366-00-00)
• 1 x Impeller (6H4-44352-02-00)
• 4 x Bolt, With Washer (90119-08M15-00)
• 1 x Woodruff Key (90280-03M03-00)
• 1 x O-Ring (93210-59MG7-00)

Installation Guide

1. Disconnect the negative battery cable and remove the engine's upper cowling.
2. Shift the outboard into neutral and remove the bolts securing the lower unit (gearcase) to the engine midsection.
3. Carefully lower and remove the gearcase to access the water pump assembly.
4. Unbolt and lift the water pump housing to expose the impeller and other components.
5. Remove the old impeller, wear plate, gaskets, and seals, taking note of their orientation.
6. Thoroughly clean the mating surfaces of any old gasket material or corrosion.
7. Install the new components from the kit, starting with the gasket, wear plate, and Woodruff key.
8. Apply a light coat of marine grease to the inside of the new pump housing and install the new impeller, turning the driveshaft clockwise to seat the vanes.
9. Secure the new housing with the provided bolts and torque them to the manufacturer's specifications.
10. Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
11. Once assembled, test the engine using a water source (flushing muffs or in the water) to confirm a steady stream from the tell-tale port.

Troubleshooting & FAQ

How do I confirm this kit fits my Yamaha engine?
Verify your engine's model and year against our "Compatible Engine Models" table. This kit is designed for Yamaha F30 models from 2013–2022 and F40 models from 2009–2022. For specific model numbers, you can use the official Yamaha guides linked above to confirm compatibility.

What are the signs that my water pump needs to be replaced?
The most common signs of a failing water pump are a weak or inconsistent water stream from the engine's tell-tale outlet, frequent engine overheating alarms, or a noticeable drop in overall cooling performance, especially at low speeds.

How often should I replace the water pump kit?
As part of preventative maintenance, we recommend inspecting the impeller annually and replacing the entire water pump repair kit every 2 to 3 years or every 200-300 hours of operation, whichever occurs first. Service intervals should be shorter if operating in saltwater or sandy/silty conditions.

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.