Water Pump Impeller Kit – Fits Yamaha F6, F8, F9.9 4-Stroke (Replaces 68T-W0078-00, 68T-W0078-01)

Water Pump Impeller Kit – Fits Yamaha F6, F8, F9.9 4-Stroke (Replaces 68T-W0078-00, 68T-W0078-01)

This water pump impeller repair kit is designed for a range of Yamaha 4-Stroke outboards from 6 to 9.9 HP, covering models from 2000 to 2017 and newer, including the F6A/F6B, F8C/F8F, and F9.9F/F9.9J series.

It serves as a direct replacement for Yamaha OEM part numbers 68T-W0078-00 and 68T-W0078-01, as well as Sierra part 18-3450 and is a core component of the Yamaha Maintenance Kit AMKITF6A.

• Provides a direct replacement for the lower unit water pump internals.
• Restores cooling system performance to prevent overheating.
• Note: This kit contains the internal repair components only and does not include the full pump housing.

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 the following components:

• 1 x Water Pump Impeller (Replaces 68T-44352-00-00)

Note: Specific gaskets, plates, and other related components required for a full rebuild are included, but quantities may vary. This kit does not include the main pump housing.

Installation Guide

1. Disconnect the negative battery cable and shift the outboard into neutral.
2. Remove the bolts securing the lower unit (gearcase) to the engine's midsection.
3. Carefully lower and separate the gearcase from the outboard. Be mindful of the shift shaft.
4. Locate the water pump assembly on top of the drive shaft.
5. Unscrew the bolts holding the pump cover and remove it.
6. Note the rotational direction of the existing impeller vanes before sliding the old impeller off the driveshaft.
7. Remove the old wear plate and any gaskets from the pump housing.
8. Clean all mating surfaces thoroughly, removing any old gasket material or debris.
9. Install the new gaskets, wear plate, and impeller. Lightly lubricate the inside of the pump cup and the new impeller.
10. Reinstall the pump cover, ensuring the impeller vanes are oriented correctly, and tighten bolts to the manufacturer's specified torque.
11. Realign the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly seated, and bolt it back to the midsection.
12. Reconnect the battery and test the engine using a water source (flushing attachment or in water), confirming a steady stream from the tell-tale port.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
First, check your engine details against the "Compatible Engine Models" table. Comparing your engine's model, horsepower, and year is the most reliable way to confirm fitment. You can also verify by cross-referencing your existing part number with those in the "Part Number Cross-Reference" list.

What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating, a weak or non-existent water stream from the "tell-tale" outlet port, or a noticeable high-pitched whining sound coming from the lower unit area during operation.

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 engine use, whichever comes first. Service intervals should be shorter if operating primarily in saltwater or silty/sandy 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.